CN105277478A - Corrosion simulation method and corrosion resistance evaluation method of galvanized steel coating in industrial atmosphere environment - Google Patents
Corrosion simulation method and corrosion resistance evaluation method of galvanized steel coating in industrial atmosphere environment Download PDFInfo
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- CN105277478A CN105277478A CN201410336613.2A CN201410336613A CN105277478A CN 105277478 A CN105277478 A CN 105277478A CN 201410336613 A CN201410336613 A CN 201410336613A CN 105277478 A CN105277478 A CN 105277478A
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Abstract
The present invention discloses a corrosion simulation method and a corrosion resistance evaluation method of a galvanized steel coating in industrial atmosphere environment, and belongs to the technical field of atmospheric corrosion of galvanized steel. The galvanized steel as a test material is used for simulation of an industrial atmosphere corrosion medium spraying solution comprising 10.41g / L of NaHSO3, 0.585g / L of NaCl, and the balance of distilled water; and spraying / drying cycle corrosion is used for simulation of industrial atmosphere corrosion process. When in the evaluation of the corrosion resistance of the galvanized steel coating, in the phase with no red rust on the coating surface, the corrosion resistance of the galvanized steel coating can be determined by the corrosion rate; and when the red rust appears on the galvanized steel coating, the protective effect of the galvanized steel coating can be determined by the red rust appearance time. The corrosion simulation method and the corrosion resistance evaluation method can be used to simulate the industrial atmosphere corrosion process, has simulation, acceleration and reproducibility properties, and can be used for rapid evaluation of the corrosion resistance of the galvanized steel coating in the industrial atmosphere environment, and the basis for rational use of galvanized protection and prediction of the protection life is provided.
Description
Technical field
The present invention relates to atmospheric corrosion simulation and the assessment technique field of galvanized steel, be specifically related to corrosion simulation method and the Evaluation of Corrosion Resistance method of galvanized steel coating under a kind of industrial atmospheric environment.
Background technology
Metal material, in the process used and be on active service, because chemistry, galvanochemistry or physical action occur for itself and environment, inevitably corrodes, as getting rusty of iron and steel.Due to spontaneity and the ubiquity of corrosion, cause huge economic loss.In order to improve corrosion stability and the serviceable life of iron and steel, reduce owing to corroding the loss brought, scientific research personnel have developed the corrosion proof method of multiple raising iron and steel.Wherein zinc-plated means of defence, because Be very effective, technique are relatively simple, lower-price characteristic, is used widely.
The standard electrode potential of zinc is-0.736V, bears than the electromotive force of iron, can play the effect of sacrificial protection iron and steel.When zinc-iron is combined into corrosion cell, zinc generation anodic solution, is supplied to iron by electronics, makes iron avoid corrosion.Zinc coat also has insulation blocking effect to steel substrate simultaneously, and the corrosive medium in separating atmospheric and steel substrate react.Zinc is easy passivation in neutral medium, has good corrosion resistance; In alkaline medium, also can form protective oxide film, avoid zinc to be corroded.In most of physical environment, the corrosion speed of zinc only has 1/10th of iron and steel to arrive one of percentage.The unique distinction of galvanized steel is also: when iron and steel is subject to exposing when coating is damaged, can form the protection that couple action provides extra between zinc layers and steel substrate.According to Coating composition and production method, zinc-platedly many kinds can be divided into.Hot dipping, plating, mechanical crimp, zincizing and thermal spray etc. can be divided into according to production method.Wherein hot dipping and electroplating technology use the widest.
Metal material corrosion is in an atmosphere a complicated process.The factor affecting atmospheric corrosion is a lot, comprises the factor of material self in general, as the kind, surface state, preparation technology etc. of material; Also have environmental factor, mainly comprise temperature, relative humidity, moistened surface time, pollutant etc.The combined effect of these factors causes different regions material corrosion speed difference very large.According to the difference of region or pollutant classification, air can be divided into rural atmosphere, urban atmosphere, industrial atmosphere, marine atmosphere, marine industry air etc.Considering that the typicalness of industrial atmospheric environment is relative harsh with representativeness and corrosivity, therefore, carry out the corrosion research of metal material under industrial atmospheric environment, is the needs of reality.
Atmospheric environment exposure test be research material atmospheric corrosion and evaluating material atmospheric corrosion resistance the most substantially, the most direct, the most the most frequently used method.It is simple to operate, and specimen shape size is unrestricted; The environment of test is identical with practical service environment with condition, and truly can reflect the corrosion condition of material under a certain environment, experimental result is true and reliable; Can be used for assessing the serviceable life of metal under actual environment, for material selection, product design and protection provide scientific basis.Overall situation exposure test also comes with some shortcomings, as: the cycle that (1) tests is oversize, can not meet timely demand; (2) because atmospheric environment is ever-changing, the collimation of test findings is very poor, is difficult to carry out more deep corrosion Mechanism Study; (3) corrosion factor in atmospheric corrosion is uncontrollable, is therefore difficult to assess each variable role etc.For rapid evaluation material corrosion stability and prediction its serviceable life, researcher has extensively carried out various laboratory simulation accelerated test study.At present about the erosion analysis of resistance to industrial atmospheric environment of galvanized sheet also do not have specification, the method for standard, therefore, carry out the galvanized sheet erosion analysis of resistance to industrial atmospheric environment and study and the method setting up the evaluation of specification, have important practical significance.
Summary of the invention
A corrosion simulation method for galvanized steel coating under industrial atmospheric environment, the method take galvanized steel as test material, adopts the mode of spraying/drying cycles corrosion to simulate industrial atmospheric process; A cycle period is 12h, and wherein spray 4h, dry 8h, and the quantity of cycle period needs to determine according to test, terminates test or terminate test after there is red rust before namely galvanized steel coating occurring red rust.
Spraying and dry temperature are 35 DEG C, and the relative humidity of spray process is 100%, and the relative humidity of dry run is less than 20%.
The spray liquid of spray process simulation industrial atmospheric used medium consists of: NaHSO
310.41g/L, NaCl0.585g/L, all the other are distilled water.
An Evaluation of Corrosion Resistance method for galvanized steel coating under industrial atmospheric environment, the method is evaluated principle and is: the red rust stage does not appear in coating surface, and judge the corrosion stability of coating with the corrosion rate of zinc coat, corrosion rate is larger, and corrosion stability is poorer; When red rust appears in galvanized steel, then judge the protective effect of zinc coat with the time of red rust appearance, more early, red rust area is larger for red rust time of occurrence, and the coating protective effect of galvanized steel is poorer.When red rust appears in galvanized steel at one time, judge the protective effect of zinc coat with red rust size.
When judging corrosion resistance of coating with the corrosion rate of zinc coat, described corrosion rate procurement process is as follows:
First calculate the corrosion weight loss (at least three group data) of galvanized steel sample different tests time, then carry out linear fit to corrosion weight loss Δ W and etching time t by Δ W=A+Bt formula, Δ W is corrosion weight loss (g/m
2), t is etching time (hour), and A, B are the constant relevant with test material and experimental enviroment, are obtained by fitting result.Take etching time as horizontal ordinate, corrosion weight loss is ordinate graphing, and the slope of fitting a straight line is corrosion rate.
Advantage of the present invention and beneficial effect are:
The present invention can be used to simulation industrial atmospheric process, has simulation, acceleration and reappearance, can be used for the corrosion stability of Fast Evaluation zinc coat under industrial atmospheric environment, for the zinc-plated protection of reasonable selection and predict that its protection life-span provides foundation.
Accompanying drawing explanation
Fig. 1 is the corrosion weight loss of galvanized steel and the relation curve of etching time in E, I and J group in the embodiment of the present invention 1; Wherein: (a) E group; (b) I group; (c) J group.
Fig. 2 is the macro morphology photo after the different galvanized steel corrosion of second steel mill, and from left to right etching time is followed successively by: 24h, 48h, 72h
Fig. 3 is the macro morphology photo after the different galvanized steel corrosion of first steel mill, and from left to right etching time is followed successively by: 24h, 48h, 72h
Embodiment
First the present invention simulates the corrosion of galvanized steel coating under industrial atmospheric environment, then establishes a kind of Fast Evaluation galvanized steel coating corrosion proof test method under industrial atmospheric environment.Can for the galvanized sheet of different batches of the galvanized sheet of different factory or same factory or the galvanized sheet etc. of different surface treatment, Fast Evaluation zinc coat is corrosion stability and protection life-span under industrial atmospheric environment.According to industrial atmospheric environment feature, compound etchant solution is with NaHSO
3be main, add a small amount of NaCl simultaneously, by spraying/drying cycles simulation industrial atmospheric process.By spraying/drying cycles simulation industrial atmospheric process, wherein: a cycle period is 12h, wherein spray 4h, dry 8h; Spraying and dry temperature are 35 DEG C, and the relative humidity of spray process is 100%, and the relative humidity of dry run is less than 20%; The spray liquid of spray process simulation industrial atmospheric used medium consists of: NaHSO
310.41g/L, NaCl0.585g/L, all the other are distilled water.
To sample Corrosion results, utilize corrosion rate analysis and macro morphology analysis, the corrosion stability of Fast Evaluation zinc coat and protective effect.The principle evaluated is: do not occur the red rust stage, judge the corrosion stability of coating with the corrosion rate of zinc coat, corrosion rate is larger, and corrosion stability is poorer; When red rust appears in galvanized steel, then judge the protective effect of zinc coat with the time occurred, the same time occurs that red rust judges with red rust size.More early, red rust area is larger for red rust time of occurrence, and the coating protective effect of galvanized steel is poorer.
For all kinds of galvanized steels that first steel mill and second steel mill provide.Concrete kind and numbering are in table 1.According to different needs, material is cut into different size.Wherein the specimen size of corrosion weight loss analysis is 50mm × 50mm; The specimen size of Analysis of Surface Topography is 20mm × 20mm.All samples are all through acetone oil removing, and alcohol rinse, dries up that to be placed in exsiccator stand-by.After placing 24 hours for the sample of zero-g aircraft in exsiccator, weigh with analytical balance, be accurate to 0.1mg.
Table 1 experiment material
To the removal of zinc coat corrosion product, adopt 100gNH
4the solution that Cl+1000ml distilled water is joined is as rust removing solution.Rust cleaning is carried out in 80 DEG C of water-baths, and the rust cleaning time is 8-10 minute.All use distilled water flushing sample after each rust cleaning, and by alcohol wipe, dry up, sample is put into exsiccator, weighing after 24 hours.Each cycle gets three parallel samples and measures corrosion weight loss value, finally adopts the mean value of three Weight loss data as measurement data.
Embodiment 1
Test for E, I, J tri-groups of samples, judge the corrosion stability of coating with the corrosion rate of zinc coat.By the test period sampling of setting, carry out processing of rust removing analysis, calculate corrosion weight loss, before there is red rust, terminate test.The weightless Δ W and etching time t of zinc atmospheric corrosion meets linear rule Δ W=At+B, and constant term A and B depends on experimental enviroment and test material.Fig. 1 provides fitting a straight line and the test figure point of E, I, J group sample corrosion weight loss and etching time in simulation industrial atmospheric environment.The linear fit related coefficient of these three kinds of galvanized steels all reaches more than 0.99, illustrates that matching correlativity is fine.Concrete fitting parameter is as follows:
E:ΔW＝1.1164t-0.8711，R
2＝0.993；
I:ΔW＝1.1436t-3.0622，R
2＝0.999；
J：ΔW＝1.4150t+1.5467，R
2＝0.999。
The slope (i.e. corrosion rate) of fitting a straight line can reflect the corrosion stability of zinc layers, and the larger corrosion stability of slope is poorer.Accordingly, the zinc coat corrosion stability of these three groups of samples is by by force to successively weak: E > I > J.
Embodiment 2
G, H, I, J, K five groups of samples provided for second steel mill are tested, and occur that time of red rust and red rust area are to judge the corrosion stability of coating with galvanized steel.The photomacrograph of five groups of samples corrosion different time (24h, 48h, 72h) as shown in Figure 2.As can be seen from Figure 2, different galvanized steel occurs that the etching time of red rust is different.There is red rust when corroding 24h in G, H group sample, but the red rust area that H group sample occurs is relatively little; A small amount of red rust is there is in J group when corroding 48h; There is a small amount of red rust when corroding 72h in I group, K group sample has not yet to see red rust when eroding to 72h.Occur that the time of red rust judges the protective effect of coating according to galvanized steel, the same time occurs that red rust judges with red rust size.The coating of these five groups of galvanized steels is simulating the protective effect under industrial atmospheric environment by being followed successively by weak by force: K > I > J > H > G.
Embodiment 3
A, B, C, D, E, F six groups of samples provided for first steel mill are tested, and occur that time of red rust and red rust area are to judge the corrosion stability of coating with galvanized steel.The photomacrograph of six groups of samples corrosion different time (24h, 48h, 72h) as shown in Figure 3.As can be seen from Figure 3, there is etching time or the red rust area difference of red rust in different galvanized steel.All there is red rust when corroding 24h in B, C, D, F group sample, wherein B, C group red rust difference in areas is few, and the red rust difference in areas of D, F group is few, and the red rust area of B, C group is slightly larger than D, F group; Red rust is there is in A group sample when corroding 48h; Red rust is there is in E group when corroding 72h.Occur that time of red rust and red rust area judge the corrosion stability of coating according to galvanized steel, the protective effect under simulation industrial atmospheric environment of the coating of these six groups of galvanized steels is by being followed successively by weak by force: E > A > D=F > B=C.
In a word, the inventive method has caught the key feature of atmospheric corrosion process-" dry/wet " cycle alternation, and the Main Factors of industrial atmospheric medium, with NaHSO
3be main, add a small amount of NaCl simultaneously.The present invention can for the galvanized sheet of different batches of the galvanized sheet of different factory or same factory or the galvanized sheet etc. of different surface treatment; carry out the corrosion process under simulation industrial atmospheric environment; the corrosion stability of coating is judged with the corrosion rate of zinc coat; or occurring that time of red rust and red rust area are to judge the corrosion stability of coating with galvanized steel, Fast Evaluation zinc coat is corrosion stability and protection life-span under industrial atmospheric environment.For the zinc-plated protection of reasonable selection and predict its protection life-span foundation is provided.
Claims (7)
1. the corrosion simulation method of galvanized steel coating under industrial atmospheric environment, is characterized in that: the method take galvanized steel as test material, adopts the mode that spraying/drying cycles is corroded to simulate industrial atmospheric process; The spray liquid of spray process simulation industrial atmospheric used medium consists of: NaHSO
310.41g/L, NaCl0.585g/L, all the other are distilled water.
2. the corrosion simulation method of galvanized steel coating under industrial atmospheric environment according to claim 1, it is characterized in that: during described spraying/drying cycles corrosion, a cycle period is 12h, and wherein spray 4h, dry 8h, the temperature of spraying and dry run is 35 DEG C.
3. the corrosion simulation method of galvanized steel coating under industrial atmospheric environment according to claim 2, it is characterized in that: the quantity of described cycle period needs to determine according to test, terminate test before namely galvanized steel coating occurring red rust or terminate test after there is red rust.
4. the corrosion simulation method of galvanized steel coating under industrial atmospheric environment according to claim 1, it is characterized in that: the relative humidity of described spray process is 100%, the relative humidity of described dry run is less than 20%.
5. the Evaluation of Corrosion Resistance method of galvanized steel coating under an industrial atmospheric environment, it is characterized in that: the method is evaluated principle and is: the red rust stage does not appear in coating surface, judge the corrosion stability of coating with the corrosion rate of zinc coat, corrosion rate is larger, and corrosion stability is poorer; When red rust appears in galvanized steel, then judge the protective effect of zinc coat with the time of red rust appearance, more early, red rust area is larger for red rust time of occurrence, and the coating protective effect of galvanized steel is poorer.
6. the Evaluation of Corrosion Resistance method of galvanized steel coating under industrial atmospheric environment according to claim 5, is characterized in that: when red rust appears in galvanized steel, when there is red rust in the same time with red rust size to judge the protective effect of zinc coat.
7. the Evaluation of Corrosion Resistance method of galvanized steel coating under industrial atmospheric environment according to claim 5, it is characterized in that: when judging corrosion resistance of coating with the corrosion rate of zinc coat, described corrosion rate procurement process is as follows:
First the corrosion weight loss (at least three group data) of galvanized steel sample different tests time is calculated, then by Δ W=A+Bt formula, matching is carried out to corrosion weight loss Δ W and etching time t, Δ W is corrosion weight loss (g/m2), t is etching time (hour), A, B are the constant relevant with test material and experimental enviroment, are obtained by fitting result.Take etching time as horizontal ordinate, corrosion weight loss is ordinate graphing, and the slope of fitting a straight line is corrosion rate.
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Cited By (6)
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| CN108844890A (en) * | 2018-06-13 | 2018-11-20 | 昆明理工大学 | A kind of electrodeposition lead and its alloy anode life assessment method |
| CN109159365A (en) * | 2018-08-30 | 2019-01-08 | 珠海格力精密模具有限公司 | Plastic material is to the corrosive evaluation method of injection mold |
| CN109580464A (en) * | 2018-11-22 | 2019-04-05 | 广西电网有限责任公司电力科学研究院 | A method of detection evaluation grid equipment coating quality |
| CN111307703A (en) * | 2020-04-22 | 2020-06-19 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Corrosion resistance evaluation method of stainless steel material |
| CN112051209A (en) * | 2020-10-09 | 2020-12-08 | 国网四川省电力公司电力科学研究院 | Automatic evaluation method for corrosion degree of power transmission and transformation steel member |
| CN113252542A (en) * | 2021-04-16 | 2021-08-13 | 首钢集团有限公司 | Evaluation method for fracture corrosion resistance of coated steel plate |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108844890A (en) * | 2018-06-13 | 2018-11-20 | 昆明理工大学 | A kind of electrodeposition lead and its alloy anode life assessment method |
| CN109159365A (en) * | 2018-08-30 | 2019-01-08 | 珠海格力精密模具有限公司 | Plastic material is to the corrosive evaluation method of injection mold |
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| CN111307703B (en) * | 2020-04-22 | 2023-04-07 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Corrosion resistance evaluation method of stainless steel material |
| CN112051209A (en) * | 2020-10-09 | 2020-12-08 | 国网四川省电力公司电力科学研究院 | Automatic evaluation method for corrosion degree of power transmission and transformation steel member |
| CN113252542A (en) * | 2021-04-16 | 2021-08-13 | 首钢集团有限公司 | Evaluation method for fracture corrosion resistance of coated steel plate |
| CN113252542B (en) * | 2021-04-16 | 2022-09-09 | 首钢集团有限公司 | Evaluation method for fracture corrosion resistance of coated steel plate |
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