CN101281114B - Soaking color transferring method for evaluating magnesium, aluminum and alloy corrosion resistance - Google Patents
Soaking color transferring method for evaluating magnesium, aluminum and alloy corrosion resistance Download PDFInfo
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- CN101281114B CN101281114B CN2008100281531A CN200810028153A CN101281114B CN 101281114 B CN101281114 B CN 101281114B CN 2008100281531 A CN2008100281531 A CN 2008100281531A CN 200810028153 A CN200810028153 A CN 200810028153A CN 101281114 B CN101281114 B CN 101281114B
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Abstract
The invention discloses an immersion changing color method for evaluating the corrosion resistances of magnesium, aluminum and the alloy, which is that the magnesium, the aluminum or the alloy is plunged in the corrosion promotion solution according to the volume to area ratio 2-100ml/cm<2 >, the time needed by that the color of the solution transforms completely is observed. The corrosion promotion solution is a water-base solution, wherein, the indicator is KMnO4, whose concentration is 2-500mg/L, the etchant is HNO3, whose concentration counting as the nitric acid with a density of 1.4g/mLis 0.2-50ml/L. The method provided by the invention is easy and feasible, does not need special instrumentation and equipment, overcomes the defects of the existing spot test method, and enhances thesensitivity and the accuracy of the test.
Description
Technical field
The invention belongs to material science and technical field, particularly a kind of method of evaluating material corrosion resisting property.
Background technology
The material property evaluation occupies critical role in the R﹠D work of material science and technology.Material corrosion stability evaluation result is directly connected to the direction of relevant process optimization, as being the various process for modifying surface of main task with the reinforcing material corrosion stability, comprise anode/differential arc oxidation, chemical conversion, electroless plating, plating or the like, all with results of corrosion-resistance as the foundation that instructs process parameter optimizing.
Material corrosion stability evaluation method is a lot, as Electrochemical Measurement Technology such as 1. electrokinetic potential polarization, ac impedance spectroscopy, cyclic voltammetries, 2. soak, partly soak and soak simulation soak test and dynamic soaking experimental technique entirely, and 3. accelerated corrosion test technology such as salt-fog test, electrolysis accelerated test, or the like.Above-mentioned measuring technology is each tool eternal lasting aspect the corrosion stability of evaluating material, there is following major defect also: rely on expensive testing tool/equipment and must possess sturdy profession basis knowledge, as 1., 2. and 3., wherein technology equipment cost 1. is the highest; Test period is long, as 2. and the test period 3. be generally more than the 24h, some test reaches several weeks most; The parsing complexity of test result is as 1..
At above-mentioned defective, directly perceived, economy and the effectively evaluating method is arisen at the historic moment.Typical in spot method.So-called droplet test, the specimen surface in cleaning drips etchant solution exactly, and solution changes the method for required time as material corrosion stability appraisal standards to corrosion occurring from dripping upward.Method as " electroplating solution and coating performance test " (Zhang Jingshuan etc. write, Chemical Industry Press,, 157-158 page or leaf in 2003) introduction.Spot method is simple and easy to do, and have following main weak point also: one, drop amount are got the liquid instrument and human factor influences bigger; Its two, corrosive liquid has different wellabilities to different materials or the different same material of surface state; Its three, too small corrosive liquid volume, changeable material surface color, the generation etc. of corroding bubble when taking place influences the accurate judgement of tester to " corrosion changes " generation easily.But above-mentioned deficiency causes droplet test result's reappearance, accuracy and comparative to be difficult to satisfactory.
Summary of the invention
The objective of the invention is to overcome the above-mentioned defective that prior art exists, the soaking color transferring method of a kind of evaluating magnesium, aluminium and alloy corrosion resistance thereof is provided.
The present invention is achieved by the following technical programs: the soaking color transferring method of a kind of evaluating magnesium, aluminium and alloy corrosion resistance thereof: magnesium, aluminium or its alloy are immersed corrosion promote liquid, taking place to change the time interval of being experienced fully with solution colour is the corrosion proof quality of annesl time evaluating material.
Described corrosion promotes that liquid is group water solution, and wherein indicator is KMnO
4, its concentration is 2～500mg/L; Wherein etchant is HNO
3, its concentration is that the nitric acid of 1.4g/mL is counted 0.2～50ml/L with density.
Described corrosion promote the long-pending ratio with material surface area of liquid promptly the appearance face than being 2-100ml/cm
2
Compared with prior art, the present invention has following advantage:
One, overcomes many defectives of existing spot method, improved the sensitivity of test and result's reappearance and comparability.By adjusting the relative content of developer and etchant, can control the test duration flexibly.
Two, simple, need not special instruments and equipment, be particularly suitable for needing the material corrosion stability is carried out the occasion (as the situation of various process for modifying surface process parameter optimizings) of fast assessing in enormous quantities, improved detection efficiency.
Embodiment
Below in conjunction with embodiment the specific embodiment of the present invention is described in detail.
Embodiment 1
Face with newly joining corrosion promotion liquid: 2mg/LKMnO with distilled water by following composition
4, 0.2ml/LHNO
3(density is 1.4g/mL, down together).The AZ91D magnesium alloy sample is polished to 1500# successively through silicon carbide paper is from coarse to fine, dry up after washing, the absolute ethyl alcohol rinsing.Compare 2ml/cm by the appearance face
2Sample is immersed above-mentioned corrosion promote liquid, jolt gently, observing solution is 2 minutes and 16.11 seconds by lilac red time of being experienced that becomes colorless.
Embodiment 2
Remove and change solution composition into 5mg/LKMnO
4, 0.5ml/LHNO
3Outward, other is with embodiment 1.It is 1 minute and 34.82 seconds by light violet magenta time of being experienced that becomes colorless that the result observes solution.
Embodiment 3
Remove and change solution composition into 10mg/LKMnO
4, 1ml/LHNO
3Outward, other is with embodiment 1.It is 1 minute and 0.13 second by aubergine time of being experienced that becomes colorless that the result observes solution.
Embodiment 4
Remove and change solution composition into 10mg/LKMnO
4, 2ml/LHNO
3Outward, other is with embodiment 1.It is 28.76 seconds by aubergine time of being experienced that becomes colorless that the result observes solution.
Embodiment 5
Remove and change solution composition into 10mg/LKMnO
4, 4ml/LHNO
3Outward, other is with embodiment 1.It is 12.47 seconds by aubergine time of being experienced that becomes colorless that the result observes solution.
Embodiment 6
Remove carrying out surface modification treatment after sample polishing, the cleaning, outside washing afterwards, drying up, other is with embodiment 4.It is 6 minutes and 54.38 seconds by aubergine time of being experienced that becomes colorless that the result observes solution.
Embodiment 7
Remove and change solution composition into 100mg/LKMnO
4, 10ml/LHNO
3Outward, other is with embodiment 1.It is 32.64 seconds by aubergine time of being experienced that becomes colorless that the result observes solution.
Embodiment 8
Remove and change solution composition into 500mg/LKMnO
4, 50ml/LHNO
3Outward, other is with embodiment 1.It is 21.86 seconds by royal purple time of being experienced that becomes colorless that the result observes solution.
Embodiment 9
Change 100ml/cm into except that holding the face ratio
2Outward, other is with embodiment 3.It is 27 minutes and 30.14 seconds by aubergine time of being experienced that becomes colorless that the result observes solution.
Embodiment 10
Except that sample being changed into the AM60B magnesium alloy, other is with embodiment 4.It is 45.56 seconds by aubergine time of being experienced that becomes colorless that the result observes solution.
Embodiment 11
Except that sample being changed into high-purity magnesium, other is with embodiment 4.It is 27.46 seconds by aubergine time of being experienced that becomes colorless that the result observes solution.
Embodiment 12
Remove with sample change the LY12 aluminium alloy into, solution composition changes 10mg/LKMnO into
4, 50ml/LHNO
3Outward, other is with embodiment 1.It is 5 minutes and 43.11 seconds by aubergine time of being experienced that becomes colorless that the result observes solution.
Obviously, the potassium permanganate in the above-mentioned developer can substitute with dichromate or trivalent iron salt.Dichromate such as potassium dichromate or sodium bichromate or its potpourri.Trivalent iron salt such as iron chloride, ferric nitrate or iron sulfate or its potpourri.
Etchant HNO
3Available following compounds or its mixture replacing: HCl or H
2SO
4
Claims (1)
1. the soaking color transferring method of an evaluating magnesium, aluminium and alloy corrosion resistance thereof, it is characterized in that magnesium, aluminium or its alloy are immersed corrosion promotes liquid, taking place to change the time interval of being experienced fully with solution colour is to estimate the corrosion proof quality of described material the annesl time; Described corrosion promotes that liquid is group water solution, and wherein indicator is KMnO
4, its concentration is 2～500mg/L; Wherein etchant is HNO
3, its concentration is that the nitric acid of 1.4g/mL is counted 0.2～50ml/L with density; Described corrosion promotes that the ratio that liquid is long-pending and described metal material surface is long-pending is 2～100ml/cm
2
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| CN2008100281531A CN101281114B (en) | 2008-05-16 | 2008-05-16 | Soaking color transferring method for evaluating magnesium, aluminum and alloy corrosion resistance |
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| CN2008100281531A CN101281114B (en) | 2008-05-16 | 2008-05-16 | Soaking color transferring method for evaluating magnesium, aluminum and alloy corrosion resistance |
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| CN101281114B true CN101281114B (en) | 2011-06-15 |
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| CN101975739B (en) * | 2010-08-27 | 2012-08-08 | 华南理工大学 | Equipment for dynamically simulating and testing biodegradability of magnesium alloy medical apparatus in vitro |
| CN101968478B (en) * | 2010-08-27 | 2013-02-13 | 华南理工大学 | Equipment for dynamically simulating and testing biodegradability of medical magnesium alloy in vitro |
| CN105021516B (en) * | 2014-04-15 | 2018-11-23 | 上海梅山钢铁股份有限公司 | A kind of test fluid and test pad pasting and its detection method of detection tin-plated board corrosion-resistance |
| CN105259100B (en) * | 2015-10-30 | 2018-04-06 | 上海电力学院 | A kind of aluminium alloy early stage corrosion produces the detection method of Al3+ ions |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85109621A (en) * | 1984-12-11 | 1986-07-16 | 西屋电气公司 | Measure the method for corrosion resisting property |
| US20030068824A1 (en) * | 1999-12-21 | 2003-04-10 | Gerald S. Frankel | Corrosion-sensing composition and method of use |
| DE102004050150A1 (en) * | 2004-10-15 | 2005-07-14 | Daimlerchrysler Ag | Corrosion testing agent for investigating metallic components having a corrosion protection coating for defect sites contains a thickener, an indicator and solvent and is transparent |
| CN1255677C (en) * | 2002-11-29 | 2006-05-10 | 宝山钢铁股份有限公司 | Electrochemical method for rapidly evaluating rustiness action of annealed cold-rolled plate |
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2008
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85109621A (en) * | 1984-12-11 | 1986-07-16 | 西屋电气公司 | Measure the method for corrosion resisting property |
| US20030068824A1 (en) * | 1999-12-21 | 2003-04-10 | Gerald S. Frankel | Corrosion-sensing composition and method of use |
| CN1255677C (en) * | 2002-11-29 | 2006-05-10 | 宝山钢铁股份有限公司 | Electrochemical method for rapidly evaluating rustiness action of annealed cold-rolled plate |
| DE102004050150A1 (en) * | 2004-10-15 | 2005-07-14 | Daimlerchrysler Ag | Corrosion testing agent for investigating metallic components having a corrosion protection coating for defect sites contains a thickener, an indicator and solvent and is transparent |
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