CN113970515A - Method for accurately measuring corrosion weight gain of metal material and application - Google Patents
Method for accurately measuring corrosion weight gain of metal material and application Download PDFInfo
- Publication number
- CN113970515A CN113970515A CN202010725319.6A CN202010725319A CN113970515A CN 113970515 A CN113970515 A CN 113970515A CN 202010725319 A CN202010725319 A CN 202010725319A CN 113970515 A CN113970515 A CN 113970515A
- Authority
- CN
- China
- Prior art keywords
- corrosion
- sample plate
- weight gain
- period
- collecting device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000005260 corrosion Methods 0.000 title claims abstract description 202
- 230000007797 corrosion Effects 0.000 title claims abstract description 202
- 238000000034 method Methods 0.000 title claims abstract description 105
- 230000004584 weight gain Effects 0.000 title claims abstract description 70
- 235000019786 weight gain Nutrition 0.000 title claims abstract description 70
- 239000007769 metal material Substances 0.000 title claims abstract description 45
- 239000000523 sample Substances 0.000 claims abstract description 101
- 238000001035 drying Methods 0.000 claims abstract description 26
- 239000013074 reference sample Substances 0.000 claims abstract description 26
- 238000005303 weighing Methods 0.000 claims abstract description 19
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000012535 impurity Substances 0.000 claims abstract description 11
- 239000000126 substance Substances 0.000 claims abstract description 6
- 238000004088 simulation Methods 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000011521 glass Substances 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 230000003746 surface roughness Effects 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 16
- 239000010959 steel Substances 0.000 abstract description 16
- 238000011156 evaluation Methods 0.000 abstract description 6
- 230000001681 protective effect Effects 0.000 abstract description 5
- 230000004580 weight loss Effects 0.000 description 24
- 208000016261 weight loss Diseases 0.000 description 24
- 239000010410 layer Substances 0.000 description 13
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 10
- 229910000870 Weathering steel Inorganic materials 0.000 description 8
- 238000005259 measurement Methods 0.000 description 8
- 238000002474 experimental method Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 235000012431 wafers Nutrition 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 description 4
- 239000003112 inhibitor Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 235000010299 hexamethylene tetramine Nutrition 0.000 description 2
- 239000004312 hexamethylene tetramine Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 241000238631 Hexapoda Species 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004210 cathodic protection Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000005237 degreasing agent Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 210000003746 feather Anatomy 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000009972 noncorrosive effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000011158 quantitative evaluation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Ecology (AREA)
- Environmental & Geological Engineering (AREA)
- Environmental Sciences (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The invention discloses a method for accurately measuring corrosion weight gain of a metal material, which measures the corrosion of the metal material by a weight gain method and comprises the following steps: step A: preparing a sample plate, simulating corrosion outdoors, directly drying the sample plate with the corrosion product after the simulation period is finished, weighing the total mass of the sample plate, and calculating the mass gain delta WA in the period; and B: collecting corrosion products and other substances falling off from the sample plate from the collecting device, drying the collecting device and the corrosion products on the collecting device after the period is finished, weighing the total mass of the corrosion products, and calculating the mass gain delta WB in the period; and C: calculating mass gain delta WC before and after the period of the reference sample plate; step D: calculating the mass gain DeltaWD of the impurities falling off from the reference sample plate in the period; the corrosion gain Δ W of the samples over the period was calculated according to the following formula: Δ W ═ Δ WA + Δ WB- (Δ WC + Δ WD). An application is also disclosed. The method is suitable for outdoor simulation, and is particularly suitable for corrosion resistance evaluation of steel products with protective rust layers.
Description
Technical Field
The invention belongs to the technical field of corrosion performance evaluation of steel products, and particularly relates to a method for evaluating corrosion resistance of an outdoor hanger of a metal material by measuring corrosion rate of the outdoor hanger by a weight gain method.
Background
The outdoor exposure test is the most traditional, most important and most easily accepted method for evaluating the corrosion resistance of metal materials in the atmospheric environment. The method is characterized in that a metal material sample to be evaluated is exposed to a typical corrosion environment, and the corrosion resistance of the sample is evaluated by periodically observing the corrosion performance of the sample in the environment. Among them, the corrosion rate is one of the most intuitive indicators for characterizing the corrosivity of the sample. Generally, methods for measuring the corrosion rate are a corrosion weight loss method and a weight gain method. When the outdoor hanging piece sample plate is washed by rainwater, corrosion products are easy to fall off and lose; in the process, dust, particle deposition and other impurities are attached, and all the factors can greatly influence the authenticity of corrosion weight gain data, so that the corrosion rate obtained by adopting a corrosion weight gain method cannot effectively represent the corrosion performance of the metal material. Therefore, the outdoor exposure experiment usually uses the weight loss rate caused by corrosion after the corrosion products on the surface of the sample plate are completely removed to characterize the corrosion resistance. At present, the corrosion resistance of the material is evaluated by a method of weighing corrosion weight increment only suitable for special occasions which have no impurity adhesion influence, cannot desorb corrosion products and cannot effectively remove the corrosion products.
However, the method for measuring the corrosion rate by adopting the weight loss method has great disadvantages, which are mainly reflected in three aspects:
1. a large number of coupons are required. Since each measurement of the etch rate requires the removal of all of the etch products formed prior to the surface of the coupons, only one average etch rate of the material over a particular cycle can be obtained for each set of coupons (3 or 5). Different sets of coupons are required to obtain the etch rate of the material at different cycles. Resulting in a dramatic increase in the number of coupons and tests.
2. The interference factors are many. Differences between different sample wafers, whether the corrosion products can be removed completely and specifically, the loss of metal materials during the process of removing the corrosion products, and the like all affect the measurement results.
3. Is not green and environment-friendly. The corrosion rate is measured by a weight loss method, and a plurality of acid washing is needed, which can cause certain influence on the environment and human body.
4. The applicability is limited. The weight loss method must rely on the proper removal of corrosion products adhered to the surface of the template, and in all cases, a proper removal method cannot be found, for example, for some steel products, such as rusted weather-resistant steel products or scaled steel hot-rolled products, the products are covered with iron oxide, the protection of the inner metal is enhanced by the iron oxide layer, the surface protective layer is the same as the corrosion products generated by the later natural corrosion of the products, and cannot be removed specifically at all, so that the corrosion rate cannot be measured by weight loss.
If the corrosion rate of the outdoor hanging pieces of the metal material can be measured by adopting a weight gain method, the corrosion rate of the outdoor hanging pieces of the metal material can be greatly reduced, the corrosion rate of the metal material in a specific outdoor environment within any time period can be obtained only by one group of hanging pieces, effective corrosion data obtained by each group of outdoor hanging pieces are greatly increased, and meanwhile, a large amount of outdoor hanging piece cost is saved for an outdoor hanging piece owner. Furthermore, if the corrosion rate can be measured by the weight-increasing method, many problems of the measurement of the corrosion rate, which cannot be solved by the conventional weight-loss method, such as the evaluation of the corrosion resistance of the weathering steel with a rust layer or the hot-rolled plate with an oxide scale, will be solved.
The prior domestic patents on the aspect of corrosion rate measurement mostly focus on the aspect of online monitoring of the corrosion rate of equipment by adopting an electrochemical technology. Various patents claimed by Rossimont corporation have adopted this type of technology, such as corrosion rate measurement systems (CN201520148367.8, CN201420802745.5), corrosion rate measurement (CN201510114343.5), corrosion rate measurement using sacrificial probes (CN201410788042.6), corrosion rate measurement using multivariate sensors (CN201510931578.3), and the like. In addition, other patents, such as a corrosion rate measuring device (CN201620368268.5), a pipeline cathodic protection and external corrosion rate monitoring probe (CN201620668591.4), a corrosion rate measuring device and measuring method (CN201610270025.2), a metal corrosion rate measuring probe and method in atmospheric environment (CN201010209506.5), etc., are also the technologies used. The technology can change the corrosion condition of online monitoring equipment through an electrochemical signal in the corrosion generation process, belongs to a method for measuring and calculating the equivalent corrosion rate by adopting an indirect method, and cannot accurately provide the material loss condition caused by corrosion. The patent film static corrosion rate measuring method (CN201210496284.9) provides a method for measuring the corrosion rate by a height difference at a profile measuring interface, but the method is only suitable for measuring the corrosion rate of a wafer in a thin liquid film and cannot be used for measuring the macroscopic corrosion rate of a metal material.
Disclosure of Invention
Therefore, the invention aims to provide a method for measuring the corrosion rate of the outdoor hanger of the metal material by a weight gain method to evaluate the corrosion resistance of the outdoor hanger.
The technical scheme of the invention is that the method for accurately measuring the corrosion weight gain of the metal material measures the corrosion of the metal material by a weight gain method, and comprises the following steps:
step A: preparing a sample plate, placing a collecting device below the sample plate to enable the sample plate to be capable of bearing all fallen objects, simulating corrosion outdoors, directly drying the sample plate with corrosion products after a simulation period is finished, weighing the total mass of the sample plate, and calculating the mass gain delta WA in the period;
and B: collecting corrosion products and other substances falling off from the sample plate from the collecting device, drying the collecting device and the corrosion products on the collecting device after the period is finished, weighing the total mass of the corrosion products, and calculating the mass gain delta WB in the period;
and C: setting a reference sample plate for each size sample plate in each environment, drying the water adsorbed on the surface of the reference sample plate after the period is finished, weighing the total mass of the reference sample plate, and calculating the mass gain delta WC before and after the period;
step D: b, arranging a collecting device which is the same as the collecting device in the step B below the reference sample plate, collecting impurities falling off from the reference sample plate, drying the device and corrosion products on the device after the period is finished, weighing the total mass of the device and the corrosion products, and calculating the mass gain delta WD in the period;
step E: the corrosion gain Δ W of the samples over the period was calculated according to the following formula:
ΔW＝ΔWA+ΔWB-(ΔWC+ΔWD)。
according to the corrosion weight gain and the composition of corrosion products, the mass of the metal elementary substance participating in the reaction, namely the corrosion weight loss, can be calculated, and further the corrosion rate can be calculated.
The template is not in contact with the collection device. The invention is particularly suitable for outdoor evaluation of corrosion weight gain.
According to the method for accurately measuring the corrosion weight gain of the metal material, the metal sample plate is preferably arranged above the collecting device, the collecting device and the collecting method are set, meanwhile, the reference sample plate with the same size is set, the same collecting device is arranged below the reference sample plate, and the weight gain of the sample plate in an outdoor simulated corrosion period is measured, and the weight gain of the reference sample plate in the period is deducted, so that the quality of the corrosion weight gain is measured.
In the step A, the sample plate is not required to be cleaned or to remove corrosion products after completing the periodic experiment, and is weighed after being directly dried.
According to the method for accurately measuring the corrosion weight gain of the metal material, the corrosion products falling off from the sample plate are preferably collected completely by the collecting device and the placing mode. Two reference devices and experimental methods are listed: wherein the mode I is as follows:
the collecting device is formed by nesting and combining a funnel-shaped open glass container and a tapered narrow-mouth container, the collecting device is placed below the sample plate, and corrosion products of the sample plate enter the tapered narrow-mouth container through the funnel and then are collected. The collecting device and the collecting method are easy to realize.
Preferably, wherein mode II is: the collecting device is made of filtering materials and is placed below the sample plate, corrosion products of the sample plate are collected by the filtering dish, and water is automatically discharged. The collecting device and the collecting method can reduce the drying time of the container.
According to the method for accurately measuring the corrosion weight gain of the metal material, the sample plate is preferably a parallelogram sample plate, the sharp angle of the sample plate is placed downwards after the sample plate rotates, the angle bisector of the downward sharp angle of the sample plate is ensured to be positioned on the same straight line with the central line of the collector below as much as possible, and the downward sharp angle of the sample plate is ensured to be inserted into the funnel or tangent to the plane where the edge of the filter vessel is positioned as much as possible under the condition that the sample plate is not in contact with the wall of the funnel.
Such a placement ensures that all rainwater enters the collector below after exiting the template through the sharp corner to ensure that corrosion products are collected. Further, to achieve a more standard result, the screed plate face is inclined at a standard angle to the horizontal, which may be 30-60 degrees.
Collector centerline, mode I funnel centerline, mode II filter bowl centerline.
Further, the template is a rectangular template.
According to the method for accurately measuring the corrosion weight gain of the metal material, the size and the shape of the reference sample plate are preferably consistent with those of the sample plate, and the surface roughness is required to be consistent with or close to those of the sample plate; it is found that the reference template and/or the collection means of the template have impurities therein which can significantly affect the weighing and which require cleaning.
The above-mentioned collecting device has sundries which can significantly influence the weighing, such as fallen leaves, broken stones, feathers, insect corpses and the like; at step C, D, a set of reference patterns may be selected for substantially identical environmental samples of the same site and the same size for the same area, for correction of material contamination.
According to the method for accurately measuring the corrosion weight gain of the metal material of the present invention, it is preferable that in the step B, C, D, all the collection devices and the reference templates involved are selected to have a material quality that is substantially stable in the corrosion environment.
The material selected for the reference template or the material of the collecting device does not change significantly in quality in the corrosive environment in which it is located. Such as glass, ceramic or corrosion resistant alloys.
Furthermore, the collecting device is formed by nesting and combining a funnel-shaped open glass container and a conical narrow-mouth container, and the collecting device is made of glass. If the filter vessel is made of the filter material, the filter material of the alumina ceramic membrane is recommended by the collecting device.
According to the method for accurately measuring the corrosion weight gain of the metal material, the drying temperature is preferably 100-120 ℃, and the object is weighed after the room temperature quality of the object is recovered after drying. More preferably, the drying is performed a plurality of times and the change in mass after each drying is compared, and the drying is stopped when the change in mass before and after drying is within 2 mg. All weights are weighted to at least the nearest milligram.
In said step A, B, C, D, all drying is required to ensure that all water on the surface of the object is removed without any other change to the object itself.
Preferably, in the collection mode and the collection method of mode I, the drying of the collection device must be performed before the reservoir is full. This is to ensure that there is no liquid spillage, which is not the case with filter dishes for mode II.
The invention also provides application of the method for accurately measuring the corrosion weight gain of the metal material in evaluating the corrosion performance of the hot rolled plate of the rusted plate. The method is particularly suitable for evaluating the corrosion resistance of steel products with protective rusty layers.
The invention relates to a method for evaluating the corrosion resistance of an outdoor hanger of a metal material by measuring the corrosion rate of the outdoor hanger by a weight gain method, which is particularly suitable for evaluating the corrosion resistance of steel products (such as weathering steel with a protective rust layer, hot rolled plates with oxide scales and the like) with protective rust layers. By adopting the technology of the invention, the corrosion rate of the metal material can be measured by a weight increasing method, the influence of factors such as falling of corrosion products, impurity adsorption and the like on the result accuracy can be effectively avoided, the corrosion rate of the material can be obtained without removing the corrosion products, and the falling and flowing conditions of the corrosion products of the material can be represented by visual results. The method has the advantages of small quantity of required sample wafers, high result accuracy and wide adaptability, and the obtained evaluation result is comprehensive, so that the corrosion performance of the material can be represented more comprehensively and objectively, and the short plate of the existing method is filled.
The invention has the beneficial effects that:
by the method, the corrosion weight gain of the metal material can be accurately obtained, the corrosion rate of the material is calculated, and the corrosion resistance of the metal product including rusty products can be represented simply, directly and objectively.
Compared with the conventional weight loss method, the method has the following remarkable advantages:
1. the corrosion resistance of the rusted steel product can be evaluated. As mentioned previously, conventional weight loss methods for measuring the corrosion rate of a sample must first remove the corrosion products by pickling or other methods, and are therefore not suitable for steel products with a rust layer attached. By adopting the method, the sample plate does not need to remove surface corrosion products, so the method is still applicable to steel products with rusty layers.
2. The number of sample wafers is greatly reduced, and more corrosion data can be obtained by a single sample wafer. After the corrosion products are removed by the traditional weight loss method, the surface state of the sample plate is changed, so that the experimental tracking cannot be continuously carried out unless special testing requirements exist, and the surface corrosion resistance after the corrosion products are removed needs to be researched. Therefore, only one data point can be obtained for one sample by measuring the corrosion rate by a weight loss method. By adopting the method, the surface state of the sample plate is not changed all the time in the test process, so that continuous test can be carried out, a sample can test a plurality of data points, and the change condition of the corrosion rate of the sample along with time can be dynamically tracked.
3. Is more environment-friendly. In order to ensure that the loss of metal materials is not caused in the process of removing corrosion products by the conventional weight loss method, acid or alkali added with a corrosion inhibitor is often used, so that the problem of waste liquid recovery is solved, and the influence on the environment is inevitable. The method does not involve the use of any corrosive medium, and the process has no influence on the environment.
4. The shedding condition of the corrosion product of the metal material can be specially evaluated. The method adopts a special device to collect the corrosion products falling off from the sample plate, so that the falling corrosion products can be specially analyzed and evaluated. The mass of the falling corrosion product can be obtained by weighing, and the falling corrosion product can be extracted and then subjected to special component analysis, tissue analysis and physical and chemical performance analysis, so that the miracle veil falling from the corrosion product can be further uncovered. Corrosion products are selectively dissolved by the traditional weight loss method, and special analysis cannot be carried out.
Drawings
FIG. 1 is a schematic diagram of an apparatus for accurately measuring corrosion weight gain of a metal material according to the present invention (manner I).
FIG. 2 is a schematic view of another apparatus for accurately measuring corrosion weight gain of a metallic material according to the present invention (mode II).
Detailed Description
The device and method for accurately measuring the corrosion weight gain of the outdoor hanger made of metal material according to the present invention will be further explained and illustrated with reference to the accompanying drawings and specific examples, which, however, should not be construed to unduly limit the technical solutions of the present invention.
The following examples were used to measure the corrosion weight gain of outdoor hanger plates made of metal materials by the following steps, the main functions and necessities of which are as follows:
1. and (5) cleaning. Collectors B and D were made. The sample A, the reference sample C and the corresponding collectors B and D are cleaned by neutral degreasing agents with the temperature of 70 ℃ and the concentration of 2%, and then the surfaces of the sample A, the reference sample C and the corresponding collectors B and D are cleaned by a large amount of clear water until uniform and continuous water films can be formed.
2. And (5) drying. And then, putting the sample plate A and the corresponding collector B into a drying box, and drying at 120 ℃ for more than 10 minutes until no liquid drops are left. The same applies to the reference template C and its collector D.
3. And (5) weighing. After the sample plate A and the collector B are cooled to room temperature and stabilized, the total mass is weighed and accurate to milligram. The same applies to the reference template C and its collector D. Steps 2 and 3 were repeated until the mass loss before and after was within 2 mg.
4. And (5) putting on a shelf. The sample plate A is obliquely arranged on the film hanging frame after rotating for 45 degrees, so that a sharp angle of the sample plate A faces downwards, and a bisector of the sharp angle is vertical. And a collector B is fixed under the downward sharp corner of the sample plate A, so that the central line of the collector B and the angular bisector of the downward sharp corner of the sample plate A are ensured to be positioned on the same straight line, and rainwater is ensured to completely enter the tapered 2 narrow-mouth container through the funnel 1 after the sharp corner is separated from the sample plate A. The reference template C and its corresponding collector D are fixed exactly the same as the template.
5. And (5) weighing on a lower rack. And (3) directly repeating the steps 2 and 3 for drying and weighing for multiple times after the period is finished without cleaning the sample plate A and the corresponding collector B until the quality result is not obviously changed. The same applies to the reference template C and its collector D.
6. And calculating the weight gain. And subtracting the total mass before the period from the total mass of the sample plate A and the corresponding collector B after each period to obtain the total weight gain of the sample plate A and the collector B in the period. The total weight gain of the reference sample plate C and the corresponding collector D is obtained by the same method, and the weight gain can represent the weight gain caused by non-corrosive factors such as impurity adhesion in the sample plate period because the mass of the reference sample plate C does not change before and after the period and the placement, the area, the roughness and the like of the reference sample plate C are close to those of the sample plate A. The two are subtracted, and the weight gain of the sample plate A caused by corrosion in the period can be obtained more accurately.
The corrosion weight gain delta W of the sample plate within the period is delta WA + delta WB-delta WC-delta WD
Example 1
Taking a 06CuPCrNiMo weathering steel hot-rolled pickled plate with the side length of 10cm, carrying out an outdoor coupon experiment in the Shanghai region according to the steps, measuring the mass gain caused by corrosion in 3 months by adopting the method, selecting a 316L hot-rolled pickled plate with the same size as a reference sample plate, and manufacturing a simple collector by adopting a glass funnel and a conical flask, as shown in figure 1.
After the experiment is finished, the direct weight gain of the sample plate before and after three months is measured to be 0.344g, the weight gain of the sample plate corresponding to the collector is 0.171g, the weight gain of the reference plate corresponding to the collector is 0.017g, and the weight gain of the reference plate corresponding to the collector is 0.045g, so that the corrosion weight gain of the sample plate is calculated to be 0.344+ 0.171-0.017-0.045-0.453 g, the loss weight loss of the corresponding Fe element is calculated to be 0.768g according to the main corrosion product FeO (OH), and the estimated corresponding annual corrosion rate is about 39.4 um/a.
Then, referring to the GB/T16545 standard, diluted hydrochloric acid added with hexamethylenetetramine as a corrosion inhibitor is adopted to clean corrosion products on the surface of the sample plate, and the mass loss caused by corrosion is measured. The sample was tested to have a corrosion weight loss of 0.783g, corresponding to an annual corrosion rate of about 40.2 um/a.
The corrosion products of 06CuPCrNiMo weathering steel in atmospheric environment are mostly FeO (OH). According to the product composition, 0.461g of hydrogen element and oxygen element are consumed for each 0.783g of iron loss, and the error is basically consistent with the data obtained by a weight gain method and is within 5 percent. The data obtained with the weight gain method is slightly lower than the weight loss method because very little of the corrosion products are blown away by the wind and cannot be collected during the process. But the overall error is within an acceptable range, the method is effective. If the weight gain of the sample plate is directly measured without the method disclosed by the patent, the weight gain data is found to be 0.344g, the weight loss data cannot be matched, and the error exceeds 25%, which indicates that a large amount of corrosion products leave the sample plate along with rainwater washing. It is even estimated that the corrosion products released from the panels after rain wash are about 0.126g (0.171-0.045-0.126 g).
Example 2
Taking a 06CuPCrNiMo weathering steel hot-rolled plate with the side length of 10cm and covered with a stable rust layer in 8 years of outdoor exposure, measuring the mass gain caused by corrosion in 3 months by adopting the method after carrying out an outdoor coupon experiment for 3 months in the Shanghai area, selecting a 316L hot-rolled pickling plate with the same size as a reference sample plate, and preparing the collector shown in the figure 2 of the nano ceramic membrane filter material.
After the experiment is finished, the direct weight gain of the sample plate before and after three months is measured to be 0.057g, the weight gain of the sample plate corresponding to the collector is 0.048g, the weight gain of the reference plate is 0.017g, and the weight gain of the reference plate corresponding to the collector is 0.045g, so that the corrosion weight gain of the sample plate is calculated to be 0.344+ 0.048-0.017-0.045-0.043 g.
Then, referring to the GB/T16545 standard, diluted hydrochloric acid added with hexamethylenetetramine as a corrosion inhibitor is adopted to clean corrosion products on the surface of the sample plate, and the mass loss caused by corrosion is measured. The corrosion weight loss of the sample was measured to be 5.013 g.
From the results, it can be seen that if the weight loss method is adopted, since the stable rust layer formed by the steel plate for 8 years and the corrosion product formed by the hanger in 3 months later are the same substances, the corrosion product cannot be removed in a targeted manner when being cleaned, the weight loss obtained at the time is the material loss caused by the zero 3-month corrosion accumulation of the steel plate for 8 years, and if the result is used for calculating the corrosion rate of the material in the last 3 months, the method is obviously unscientific. Therefore, the weight loss method can only obtain the average corrosion rate of the steel plate for 8 years for 3 months, but cannot obtain the corrosion rate of the steel plate for the last 3 months after obtaining the stable rust layer protection.
By adopting the method, the corrosion weight gain of the 06CuPCrNiMo weathering steel with rust layer protection within 3 months can be accurately obtained, and the corrosion rate can be further calculated. If calculated as the corrosion product being FeO (OH), the weight gain should correspond to a material weight loss of 0.073g, and a rough estimate corresponds to an annual corrosion rate of 3.74 um/a. The annual average corrosion rate of the material within 8 years calculated by weight loss method is 7.79 um/a. The corrosion rate of the weathering steel protected by the stabilized rust layer is greatly reduced.
The mass of corrosion products dripping from the steel plate can be accurately calculated by the method, and is only about 0.03g (0.48-0.45-0.03 g), which is far lower than the early 0.126 g. Therefore, after stabilization, the shedding of the corrosion products of the weathering steel is also obviously improved. This is consistent with literature reports, but quantitative evaluations can be made using this approach.
In the device shown in fig. 1 and 2, the liquid falling from the sample plate can be completely collected, and the weight gain caused by impurity attachment and the like can be effectively deducted by the method shown in the figure, so that the weighing accuracy is enhanced.
The invention particularly relates to a device and a method for accurately measuring the corrosion weight gain of a metal material, which are particularly suitable for the corrosion resistance evaluation of a steel product with a protective rust layer. By adopting the technology disclosed by the invention, the corrosion weight gain of the outdoor hanging piece of the metal material can be accurately measured, the influence of factors such as falling of a corrosion product, impurity adsorption and the like on the result accuracy is effectively avoided, the corrosion rate of the metal material can be accurately obtained by a weight gain method without removing the corrosion product, the required sample quantity is greatly reduced, the method has the advantages of high result accuracy, wide adaptability and the like, and important information such as the falling condition of a sample plate corrosion product can be easily obtained, so that the corrosion characteristic of the material can be more comprehensively evaluated, and the short plate of the existing method is filled.
Claims (10)
1. A method for accurately measuring the corrosion weight gain of a metal material is characterized in that the corrosion of the metal material is measured by a weight gain method, and the method comprises the following steps:
step A: preparing a sample plate, placing a collecting device below the sample plate to enable the sample plate to be capable of bearing all fallen objects, simulating corrosion outdoors, directly drying the sample plate with corrosion products after a simulation period is finished, weighing the total mass of the sample plate, and calculating the mass gain delta WA in the period;
and B: collecting corrosion products and other substances falling off from the sample plate from the collecting device, drying the collecting device and the corrosion products on the collecting device after the period is finished, weighing the total mass of the corrosion products, and calculating the mass gain delta WB in the period;
and C: setting a reference sample plate for each size sample plate in each environment, drying the water adsorbed on the surface of the reference sample plate after the period is finished, weighing the total mass of the reference sample plate, and calculating the mass gain delta WC before and after the period;
step D: b, arranging a collecting device which is the same as the collecting device in the step B below the reference sample plate, collecting impurities falling off from the reference sample plate, drying the device and corrosion products on the device after the period is finished, weighing the total mass of the device and the corrosion products, and calculating the mass gain delta WD in the period;
step E: the corrosion gain Δ W of the samples over the period was calculated according to the following formula:
ΔW＝ΔWA+ΔWB-(ΔWC+ΔWD)。
2. the method of accurately measuring corrosion weight gain of a metallic material of claim 1, wherein: the method comprises the steps of placing a metal sample plate above a collecting device, setting the collecting device and the collecting method, simultaneously setting a reference sample plate with the same size, arranging the same collecting device below the reference sample plate, and measuring the weight gain of the sample plate in an outdoor simulated corrosion period and deducting the weight gain of the reference sample plate in the period to measure the quality of corrosion weight gain.
3. The method for accurately measuring the corrosion weight gain of a metallic material according to claim 1 or 2, wherein:
the collecting device is formed by nesting and combining a funnel-shaped open glass container and a tapered narrow-mouth container, the collecting device is placed below the sample plate, and corrosion products of the sample plate enter the tapered narrow-mouth container through the funnel and then are collected.
4. The method for accurately measuring the corrosion weight gain of a metallic material according to claim 1 or 2, wherein: the collecting device is made of filtering materials and is placed below the sample plate, corrosion products of the sample plate are collected by the filtering dish, and water is automatically discharged.
5. The method of accurately measuring corrosion weight gain of a metallic material of claim 1, wherein: the sample plate is a parallelogram sample plate, the sharp angle of the sample plate is placed downwards after the sample plate rotates, the angular bisector of the downward sharp angle of the sample plate and the central line of the collector below the sample plate are ensured to be positioned on the same straight line as much as possible, and the downward sharp angle of the sample plate is ensured to be inserted into the funnel or tangent to the plane where the edge of the filter vessel is positioned as much as possible under the condition that the sample plate is not in contact with the wall of the funnel.
6. The method of accurately measuring corrosion weight gain of a metallic material of claim 1, wherein: the size and the shape of the reference template are consistent with those of the template, and the surface roughness of the reference template is consistent with or close to that of the template; it is found that the reference template and/or the collection means of the template have impurities therein which can significantly affect the weighing and which require cleaning.
7. The method of accurately measuring corrosion weight gain of a metallic material of claim 1, wherein: in step B, C, D, all of the collection devices and reference templates involved are selected from materials that remain substantially stable in quality in the corrosive environment.
8. The method as claimed in claim 1, wherein the drying temperature is 100 ℃ to 120 ℃, and the weight of the object is weighed after the object recovers room temperature and the quality is stable after drying.
9. The method of accurately measuring corrosion weight gain of a metallic material of claim 3, wherein: the drying of the collecting device must be carried out before the reservoir is full.
10. Use of the method of accurately measuring the corrosion weight gain of a metallic material according to claim 1 for evaluating the corrosion performance of hot-rolled sheet of rust.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010725319.6A CN113970515B (en) | 2020-07-24 | 2020-07-24 | Method for accurately measuring corrosion weight gain of metal material and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010725319.6A CN113970515B (en) | 2020-07-24 | 2020-07-24 | Method for accurately measuring corrosion weight gain of metal material and application thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113970515A true CN113970515A (en) | 2022-01-25 |
| CN113970515B CN113970515B (en) | 2023-11-14 |
Family
ID=79585858
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010725319.6A Active CN113970515B (en) | 2020-07-24 | 2020-07-24 | Method for accurately measuring corrosion weight gain of metal material and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113970515B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115598052A (en) * | 2022-12-14 | 2023-01-13 | 广东辉固材料科技有限公司（Cn） | Glass fiber reinforcement corrosion resistance test equipment and test method |
Citations (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1089487A1 (en) * | 1983-01-10 | 1984-04-30 | Предприятие П/Я М-5356 | Metal material cavitaion stability determination method |
| US5208162A (en) * | 1990-05-08 | 1993-05-04 | Purafil, Inc. | Method and apparatus for monitoring corrosion |
| RU2019815C1 (en) * | 1987-08-27 | 1994-09-15 | Чернов Борис Борисович | Method to determine metals and alloys corrosion speed |
| US5583426A (en) * | 1993-04-16 | 1996-12-10 | Tiefnig; Eugen | Method and apparatus for determining corrosivity of fluids on metallic materials |
| US20040178806A1 (en) * | 2003-03-10 | 2004-09-16 | Foreman Donald S. | Micropower apparatus for low impedance measurements |
| US20060027670A1 (en) * | 2004-08-04 | 2006-02-09 | Amichai Shdaimah | Humidity-controlled chamber for a thermogravimetric instrument |
| CN101566556A (en) * | 2009-06-01 | 2009-10-28 | 彩虹集团电子股份有限公司 | Method for testing aging characteristic of phosphor for 253.7-nanometer UV excitation lamp |
| CN101685061A (en) * | 2008-09-23 | 2010-03-31 | 宝山钢铁股份有限公司 | Simulation accelerated test method and device of corrosion performance of metal in atmosphere |
| CN101769852A (en) * | 2010-01-07 | 2010-07-07 | 中国地质大学（武汉） | Test unit for erosion wear of diamond bit matrix material and measuring method thereof |
| TW201031903A (en) * | 2009-02-23 | 2010-09-01 | Taiwan Power Co | Dew point corrosion monitoring and evaluation system for metallic materials in acid oxygen environment |
| CN101865814A (en) * | 2010-04-02 | 2010-10-20 | 上海工程技术大学 | Thermal barrier coating layer high-temperature resistance molten salt corrosion test method and device |
| CN103398942A (en) * | 2013-07-09 | 2013-11-20 | 哈尔滨工程大学 | Experimental device for hydrogen permeation behaviors of local areas of metal |
| CN203616234U (en) * | 2013-10-17 | 2014-05-28 | 中国石油化工股份有限公司 | Test device for determining metal corrosion |
| CN104155235A (en) * | 2014-09-10 | 2014-11-19 | 四川省科学城海天实业总公司 | Atmospheric corrosion rate online monitoring sensor |
| CN104237120A (en) * | 2014-09-18 | 2014-12-24 | 北京科技大学 | Automatic testing device for thermal shock property and thermal cycle oxidation property |
| CN204142617U (en) * | 2014-09-10 | 2015-02-04 | 四川省科学城海天实业总公司 | Atmospheric corrosion rate on-line monitoring sensor |
| JP2016180658A (en) * | 2015-03-24 | 2016-10-13 | Ｊｆｅスチール株式会社 | Method for evaluating delayed fracture property of metal material and metal material |
| US20160363525A1 (en) * | 2013-09-27 | 2016-12-15 | Luna Innovations Incorporated | Measurement systems and methods for corrosion testing of coatings and materials |
| CN106290042A (en) * | 2015-05-29 | 2017-01-04 | 武汉大学 | A kind of method that quick research aluminum corrodes in demineralized water |
| CN106841027A (en) * | 2017-03-02 | 2017-06-13 | 河钢股份有限公司 | The detection of simulation accelerated metal material acidic atmosphere environmental corrosion and evaluation method |
| CN107505256A (en) * | 2017-09-13 | 2017-12-22 | 大连理工大学 | Weld corrosion monitoring device and its monitoring method under stress can be simulated |
| CN107907472A (en) * | 2017-10-27 | 2018-04-13 | 歌尔股份有限公司 | A kind of method that neutral salt spray test confirms |
| CN108020501A (en) * | 2017-11-15 | 2018-05-11 | 华南理工大学 | A kind of atmospheric corrosion grade drawing drawing method |
-
2020
- 2020-07-24 CN CN202010725319.6A patent/CN113970515B/en active Active
Patent Citations (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1089487A1 (en) * | 1983-01-10 | 1984-04-30 | Предприятие П/Я М-5356 | Metal material cavitaion stability determination method |
| RU2019815C1 (en) * | 1987-08-27 | 1994-09-15 | Чернов Борис Борисович | Method to determine metals and alloys corrosion speed |
| US5208162A (en) * | 1990-05-08 | 1993-05-04 | Purafil, Inc. | Method and apparatus for monitoring corrosion |
| US5583426A (en) * | 1993-04-16 | 1996-12-10 | Tiefnig; Eugen | Method and apparatus for determining corrosivity of fluids on metallic materials |
| US20040178806A1 (en) * | 2003-03-10 | 2004-09-16 | Foreman Donald S. | Micropower apparatus for low impedance measurements |
| US20060027670A1 (en) * | 2004-08-04 | 2006-02-09 | Amichai Shdaimah | Humidity-controlled chamber for a thermogravimetric instrument |
| CN101685061A (en) * | 2008-09-23 | 2010-03-31 | 宝山钢铁股份有限公司 | Simulation accelerated test method and device of corrosion performance of metal in atmosphere |
| TW201031903A (en) * | 2009-02-23 | 2010-09-01 | Taiwan Power Co | Dew point corrosion monitoring and evaluation system for metallic materials in acid oxygen environment |
| CN101566556A (en) * | 2009-06-01 | 2009-10-28 | 彩虹集团电子股份有限公司 | Method for testing aging characteristic of phosphor for 253.7-nanometer UV excitation lamp |
| CN101769852A (en) * | 2010-01-07 | 2010-07-07 | 中国地质大学（武汉） | Test unit for erosion wear of diamond bit matrix material and measuring method thereof |
| CN101865814A (en) * | 2010-04-02 | 2010-10-20 | 上海工程技术大学 | Thermal barrier coating layer high-temperature resistance molten salt corrosion test method and device |
| CN103398942A (en) * | 2013-07-09 | 2013-11-20 | 哈尔滨工程大学 | Experimental device for hydrogen permeation behaviors of local areas of metal |
| US20160363525A1 (en) * | 2013-09-27 | 2016-12-15 | Luna Innovations Incorporated | Measurement systems and methods for corrosion testing of coatings and materials |
| CN203616234U (en) * | 2013-10-17 | 2014-05-28 | 中国石油化工股份有限公司 | Test device for determining metal corrosion |
| CN104155235A (en) * | 2014-09-10 | 2014-11-19 | 四川省科学城海天实业总公司 | Atmospheric corrosion rate online monitoring sensor |
| CN204142617U (en) * | 2014-09-10 | 2015-02-04 | 四川省科学城海天实业总公司 | Atmospheric corrosion rate on-line monitoring sensor |
| CN104237120A (en) * | 2014-09-18 | 2014-12-24 | 北京科技大学 | Automatic testing device for thermal shock property and thermal cycle oxidation property |
| JP2016180658A (en) * | 2015-03-24 | 2016-10-13 | Ｊｆｅスチール株式会社 | Method for evaluating delayed fracture property of metal material and metal material |
| CN106290042A (en) * | 2015-05-29 | 2017-01-04 | 武汉大学 | A kind of method that quick research aluminum corrodes in demineralized water |
| CN106841027A (en) * | 2017-03-02 | 2017-06-13 | 河钢股份有限公司 | The detection of simulation accelerated metal material acidic atmosphere environmental corrosion and evaluation method |
| CN107505256A (en) * | 2017-09-13 | 2017-12-22 | 大连理工大学 | Weld corrosion monitoring device and its monitoring method under stress can be simulated |
| CN107907472A (en) * | 2017-10-27 | 2018-04-13 | 歌尔股份有限公司 | A kind of method that neutral salt spray test confirms |
| CN108020501A (en) * | 2017-11-15 | 2018-05-11 | 华南理工大学 | A kind of atmospheric corrosion grade drawing drawing method |
Non-Patent Citations (3)
| Title |
|---|
| CSAKI LOANA 等: "Nickel based coatings used for erosion-corrosion protection in a geothermal environment", SURFACE & COATINGS TECHNOLOGY, vol. 350, pages 531 - 541, XP085445548, DOI: 10.1016/j.surfcoat.2018.07.029 * |
| 刘海璋;李晓延;贺定勇;: "镍基合金药芯焊丝熔敷金属耐腐蚀性能的研究", 焊接, no. 04, pages 38 - 41 * |
| 谢红筝;: "金属材料腐蚀控制标样的制备和使用方法", 化工中间体, no. 10, pages 33 - 34 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115598052A (en) * | 2022-12-14 | 2023-01-13 | 广东辉固材料科技有限公司（Cn） | Glass fiber reinforcement corrosion resistance test equipment and test method |
| CN115598052B (en) * | 2022-12-14 | 2023-03-07 | 广东辉固材料科技有限公司 | Glass fiber reinforcement corrosion resistance test equipment and test method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113970515B (en) | 2023-11-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106841027A (en) | The detection of simulation accelerated metal material acidic atmosphere environmental corrosion and evaluation method | |
| Liu et al. | Electrochemical monitoring of the degradation of galvanized steel in simulated marine atmosphere | |
| Guo et al. | Rust layer adhesion capability and corrosion behavior of weathering steel under tension during initial stages of simulated marine atmospheric corrosion | |
| CN105277479A (en) | Corrosion simulation method and corrosion resistance evaluation method of galvanized steel coating in sea atmospheric environment | |
| CN113970515B (en) | Method for accurately measuring corrosion weight gain of metal material and application thereof | |
| CN107907472A (en) | A kind of method that neutral salt spray test confirms | |
| Song et al. | Effect of relative humidity on corrosion of Q235 carbon steel under thin electrolyte layer in simulated marine atmosphere | |
| CN107574439A (en) | Aggressive agent that FB2 steel original austenite crystal preventions are shown, preparation method and application | |
| Ma et al. | Investigation on the initial atmospheric corrosion of mild steel in a simulated environment of industrial coastland by thin electrical resistance and electrochemical sensors | |
| Tidblad et al. | Exposure programme on atmospheric corrosion effects of acidifying pollutants in tropical and subtropical climates | |
| CN104568638A (en) | Method for testing binding ability of rust layer and substrate of rusted steel sample, and apparatus thereof | |
| CN112630130A (en) | Method for detecting iron oxide on surface of hot-rolled wire rod | |
| CN105403480B (en) | A kind of assay method of continuous casting billet central dense degree | |
| Montgomery et al. | Timescale correlation between marine atmospheric exposure and accelerated corrosion testing | |
| CN112051207B (en) | Online evaluation device and evaluation method for corrosion inhibitor coating effect of gas gathering pipeline in mountainous area | |
| CN108562532A (en) | A kind of quantitative evaluation method of steel wire coating corrosion resistance | |
| CN106769828B (en) | The corrosion rate determination method that neutral salt spray test interrupts | |
| CN203519451U (en) | Device for testing bonding performance between rust layer of rusted steel sample and matrix | |
| CN207832641U (en) | A kind of device for stainless steel intercrystalline corrosion experiment | |
| CHEN et al. | Shot noise analysis on corrosion behavior of zinc alloy (ZnAl4Cu1) under dry-wet cycles | |
| Costa et al. | Impact of the environmental conditions on the conservation of metal artifacts: an evaluation using electrochemical techniques | |
| JP6655372B2 (en) | A Simple Method for Evaluating the Corrosion Life of Zinc Plating Equipment Using Copper Pieces | |
| WO2005106428A1 (en) | Direct measurement method and equipment of antitrust performance of aqueous protective fluid with wire beam electrode sensor | |
| CN110487876B (en) | Atmospheric chlorine content detection characterization method | |
| JP2006038835A (en) | Method for measuring corrosion rate of metal and corrosion-proof method for metal using the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |