CN102297815A - Sample and method for determining metal corrosion rate - Google Patents
Sample and method for determining metal corrosion rate Download PDFInfo
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- CN102297815A CN102297815A CN2011101340736A CN201110134073A CN102297815A CN 102297815 A CN102297815 A CN 102297815A CN 2011101340736 A CN2011101340736 A CN 2011101340736A CN 201110134073 A CN201110134073 A CN 201110134073A CN 102297815 A CN102297815 A CN 102297815A
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Abstract
The invention relates to the field of metal corrosion experiments, and especially relates to a sample and a method for determining the metal corrosion rate. The sample for determining the metal corrosion rate is a capsule type. The method for determining the metal corrosion rate comprises the following steps: 1, processing a metal to be detected into the sample by machining; 2, obtaining an original weight G1 and an original surface area S of the sample by determining; 3, corroding the sample by fixing the sample in a corrosion medium; 4, taking out the sample when an experiment period is finished, and removing corrosion products; 5, drying for 24h in an oven, and obtaining a sample weight G2 by weighing; and 6, obtaining the metal corrosion rate according to a formula (G2-G1)/P*S*T by supposing the experiment period as T and the metal density as P, and treating G2-G1 as the weight loss. The metal sample which has the advantage of reasonable design overcomes an avoidless accelerated corrosion effect of corners of traditional rectangular samples. The method for determining the metal corrosion rate has the advantages of less error and accurate calculating result.
Description
Technical field
The present invention relates to metal erosion experiment field, particularly measure rate of metal corrosion sample and method thereof.
Background technology
In metal corrosion and protection Study on Technology field, judge that the metal erosion degree methods mainly contains weight-loss method and corroded area method, because weight-loss method is easy and simple to handle, is convenient to accurate measurement, by vast corrosion research personnel are adopted.But, the resultant error of weight-loss method measurement at present is bigger, trace it to its cause, be because in rate of metal corrosion mensuration process, test button generally adopts rectangular structure, because rectangular parallelepiped has 12 limits and 8 angles, has sharp angle effect clearly, sharp angle effect be meant two sides or three constitute angles less than 120 ° situation under, can produce stress at sharp corner and concentrate, when stress acquired a certain degree, sharp corner was the place that cracks at first, under the sustained stress effect, the continuous expansion of crackle finally causes the finished product fracture or splits.In corrosion process, there is machining stress in corner especially corner positions, and defectives such as dislocation are more, causes metal arrisdefect to occur in corrosion process and lacks the limit, the serious distortion of corrosion weight loss, thereby make the corrosion rate error that calculates bigger, in order accurately to measure corrosion of metal speed, the present invention takes to change the method for metal corrosion coupon shape, avoided tangible sharp angle effect, make the rate of metal corrosion of measuring truly reasonable, reduced error, improved measuring accuracy.
Summary of the invention
In order to overcome the shortcoming of prior art, the invention provides a kind of mensuration rate of metal corrosion sample and method thereof, this test button is reasonable in design, has overcome the unavoidable corner accelerated corrosion of traditional rectangle sample effect.The assay method error is little, and result of calculation is accurate.
Measure the rate of metal corrosion sample, be capsule-type.
Measure the rate of metal corrosion sample, be ball-type.
Measure the rate of metal corrosion sample, be ellipse.
Measure the method for rate of metal corrosion, comprise the following steps: (1), metal to be measured be processed into sample by machining; (2), measure the original weight and the surface area of sample, obtain original weight G1 and surface area S; (3), sample is fixed in the corrosive medium corrodes; (4), after finishing experimental period, take out sample, know corrosion product; (5), in baking oven the oven dry 24 hours after, the title sample weight is G2; (6), to establish described experimental period be T, density metal is P, G2-G1 is weightless weight, promptly gets rate of metal corrosion according to formula (G2-G1)/P*S*T.
Test button of the present invention is reasonable in design, has overcome the unavoidable corner accelerated corrosion of traditional rectangle sample effect.The assay method error is little, and result of calculation is accurate.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is a sample front view of the present invention;
Fig. 2 is a sample left view of the present invention.
Embodiment
As shown in drawings, the sample of mensuration rate of metal corrosion is a capsule-type.
The total surface area of described sample should be more than 10cm2.
Described sample, if consider the data contrast, different metals should be taked identical or approaching size.
Measure the method for rate of metal corrosion, comprise the following steps: (1), by machining metal to be measured be processed into sample, as shown in drawings; (2), measure the original weight and the surface area of sample, obtain original weight G1 and surface area S; (3), sample is fixed in the corrosive medium corrodes; (4), after finishing experimental period, take out sample, know corrosion product; (5), in baking oven the oven dry 24 hours after, the title sample weight is G2; (6), to establish described experimental period be T, density metal is P, G2-G1 is weightless weight, promptly gets rate of metal corrosion according to formula (G2-G1)/P*S*T.
The sample of described step (1) when having oxide skin to adhere on the specimen surface, is used the way of cutting or grinding and is removed.The emery cloth of described grinding or sand paper granularity meet GB/T 2481.1 standards, grind in order, avoid heating during grinding, are that the waterproof abrasive paper of W20 carries out wet-milling with granularity at last.When if specimen surface has requiring of roughness unanimity, can grind with grinding machine.
The sample of described step (1) with absolute ethyl alcohol or acetone oil removing, is deposited in the exsiccator standby after the surface clean.
The long-pending method of the mensuration specimen surface of described step (2) is: with the size of vernier caliper measurement sample, calculate the total surface area of sample and the useful area (deducting strong point area) of sample.
The method of the mensuration sample original weight of described step (2), sample weight is accurate to 0.01g.
Embodiment:
Metal material to be measured is 2205 stainless steels, and corrosive medium is 6% liquor ferri trichloridi.2205 test button processing dimension: R=5, L=30.Measure the method for 2205 Corrosion of Stainless Steel speed, comprise the following steps:
(1), be ground to smooth with sand paper in order to 2205 test button surfaces; (2), the weighing sample weight is 22.9691g; With the size of vernier caliper measurement sample, the total surface area of calculating sample is 1004.8mm2, and useful area is 1003mm2 (deducting strong point area); (3), 6% liquor ferri trichloridi of configuration is added in the beaker of 500ml, beaker is put in 35 ℃ the constant temperature water bath, sample is put on the support in the beaker, be 24 hours experimental period; (4), remove corrosion product, cleaning-drying is after 24 hours, the weighing sample weight is 22.9665g; (5), 2205 test button corrosion weight losses are 0.0026g, calculating 2205 stainless steels corrosion rate in 6% liquor ferri trichloridi is 0.1078g/m2h.
Claims (6)
1. measure the rate of metal corrosion sample for one kind, it is characterized in that: the capsule-type that is shaped as of measuring the rate of metal corrosion sample.
2. mensuration rate of metal corrosion sample according to claim 1 is characterized in that: described mensuration rate of metal corrosion sample be shaped as ball-type.
3. mensuration rate of metal corrosion sample according to claim 1 is characterized in that: described mensuration rate of metal corrosion sample be shaped as ellipse.
4. mensuration rate of metal corrosion sample according to claim 1, it is characterized in that: the total surface area of described sample should be more than 10cm2.
5. mensuration rate of metal corrosion sample according to claim 1 is characterized in that: described sample, if consider the data contrast, different metals should be taked identical or approaching size.
6. a method of measuring rate of metal corrosion comprises the following steps: (1), by machining metal to be measured is processed into sample; (2), measure the original weight and the surface area of sample, obtain original weight G1 and surface area S; (3), sample is fixed in the corrosive medium corrodes; (4), after finishing experimental period, take out sample, know corrosion product; (5), in baking oven the oven dry 24 hours after, the title sample weight is G2; (6), to establish described experimental period be T, density metal is P, G2-G1 is weightless weight, promptly gets rate of metal corrosion according to formula (G2-G1)/P*S*T.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101340736A CN102297815A (en) | 2011-05-23 | 2011-05-23 | Sample and method for determining metal corrosion rate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101340736A CN102297815A (en) | 2011-05-23 | 2011-05-23 | Sample and method for determining metal corrosion rate |
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| Publication Number | Publication Date |
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| CN102297815A true CN102297815A (en) | 2011-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011101340736A Pending CN102297815A (en) | 2011-05-23 | 2011-05-23 | Sample and method for determining metal corrosion rate |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104949912A (en) * | 2015-07-03 | 2015-09-30 | 上海市刑事科学技术研究院 | Detecting method of metal corrosion feature and corrosion time correlation |
| CN106248514A (en) * | 2016-07-21 | 2016-12-21 | 中石化炼化工程（集团）股份有限公司 | A kind of method testing material high temperature resistant fluid scouring corrosive nature and device thereof |
| CN106442293A (en) * | 2016-10-10 | 2017-02-22 | 武汉钢铁股份有限公司 | Method for testing carbon dioxide corrosion resistance of low-Cr pipeline steel |
| CN110231278A (en) * | 2019-07-05 | 2019-09-13 | 南京钢铁股份有限公司 | A kind of salt spray test method detecting bright as silver material antirust oil protecting effect |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4019133A (en) * | 1975-12-29 | 1977-04-19 | Gulf Research & Development Company | Corrosion detecting and monitoring apparatus |
| CN1220392A (en) * | 1997-10-15 | 1999-06-23 | 栗田工业株式会社 | Corrosion monitoring |
| WO2003073073A2 (en) * | 2002-02-28 | 2003-09-04 | Bnfl (Ip) Limited | Corrosion testing of metals |
-
2011
- 2011-05-23 CN CN2011101340736A patent/CN102297815A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4019133A (en) * | 1975-12-29 | 1977-04-19 | Gulf Research & Development Company | Corrosion detecting and monitoring apparatus |
| CN1220392A (en) * | 1997-10-15 | 1999-06-23 | 栗田工业株式会社 | Corrosion monitoring |
| WO2003073073A2 (en) * | 2002-02-28 | 2003-09-04 | Bnfl (Ip) Limited | Corrosion testing of metals |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104949912A (en) * | 2015-07-03 | 2015-09-30 | 上海市刑事科学技术研究院 | Detecting method of metal corrosion feature and corrosion time correlation |
| CN106248514A (en) * | 2016-07-21 | 2016-12-21 | 中石化炼化工程（集团）股份有限公司 | A kind of method testing material high temperature resistant fluid scouring corrosive nature and device thereof |
| CN106442293A (en) * | 2016-10-10 | 2017-02-22 | 武汉钢铁股份有限公司 | Method for testing carbon dioxide corrosion resistance of low-Cr pipeline steel |
| CN110231278A (en) * | 2019-07-05 | 2019-09-13 | 南京钢铁股份有限公司 | A kind of salt spray test method detecting bright as silver material antirust oil protecting effect |
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Application publication date: 20111228 |