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Test method for evaluating corrosion resistance of coating

A technology of corrosion resistance and test method, applied in weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc. Layer screening and other issues to achieve the effect of convenient preliminary screening, rapid evaluation, and good reproducibility

Inactive Publication Date: 2015-01-07
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] There are many coatings in the prior art that can play a protective role in the environment containing liquid bromine, but there is a lack of a specific means and test method for evaluating its protective performance, and it is impossible to quickly make a quick estimate of the corrosion resistance of the coating in bromine solution. The evaluation of the bromine solution corrosion resistance coating can not be screened

Method used

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  • Test method for evaluating corrosion resistance of coating
  • Test method for evaluating corrosion resistance of coating
  • Test method for evaluating corrosion resistance of coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Step 1. Cut the Q235 steel into a test piece with a size of 25mm×60mm×2mm, and perform sandblasting on the surface, and clean it for later use;

[0039] Step 2. Use electrostatic spraying technology to evenly spray a Teflon coating on the surface of the test piece to obtain a test piece 1. The Teflon coating should completely cover the test piece 1. Take pictures to record the coating morphology. Measure 1 three times, take the average value, and obtain the size of test piece 1: 27.20mm×62.12mm×5.26mm, and the mass is 15.8978g;

[0040] Step 3, configure the corrosion solution in the reactor, wherein the mass ratio of each component is liquid bromine: water: n-hexane = 0.5: 1.5: 98, and install the test piece 1 in the reactor lined with polytetrafluoroethylene ;

[0041] Step 4. Place test piece 1 in the reaction kettle for hanging test, take the piece after 24 hours, clean the surface and dry to get test piece 2;

[0042] Step 5. After the test, the test piece 2 was ...

Embodiment 2

[0045] The difference from Example 1 is that in step 2, a ceramic coating containing SiC is uniformly sprayed on the surface of the test piece by plasma spraying technology to obtain a test piece 1, the size of which is 27.14mm×62.08mm×5.18 mm, the mass is 18.2465g.

[0046]In step 5, the mass of the test piece 2 after the experiment is 18.2298g, and the weight loss of the test piece before and after the test is calculated by the formula (1) by the weight loss method to be 0.0167g, and the corrosion rate is 0.1620g / (m 2 h).

Embodiment 3

[0048] The difference from Example 1 is that in step 2, a ceramic coating containing TiC is evenly sprayed on the surface of the test piece by using plasma spraying technology to obtain a test piece 1, and the size of the test piece 1 is 27.12mm×62.10mm×5.20 mm, the mass is 18.8531g.

[0049] In step 5, the mass of the test piece 2 after the experiment is 18.8442g, and the weight loss of the test piece before and after the test is calculated by the formula (1) by the weight loss method to be 0.0089g, and the corrosion rate is 0.0863g / (m 2 h)

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Abstract

The invention provides a test method for evaluating corrosion of a coating in a bromine-containing corrosive solution. The test method comprises the following steps: firstly, cutting a steel plate into a test sheet with a certain size, and pretreating the surface of the test sheet; secondly, coating the surface of the pretreated test sheet with an anticorrosive coating to obtain a test sheet 1, photographing, recording the coating morphology and measuring the size and the quality of the test sheet 1; thirdly, preparing the corrosive solution, putting the test sheet 1 therein for testing, taking out the test sheet 1 after a period time, and drying to obtain a test sheet 2; and finally, weighing the test sheet 2, observing the corrosion morphology, and calculating the weight loss and the corrosion rate of the test sheet 1 so as to evaluate the corrosion resistance of the coating. By the test method, corrosion resistances of different coatings in a bromine solution can be evaluated, preliminary screening for the coatings resistant to the corrosion of the bromine solution is facilitated, and a basis for selecting the anticorrosive coating in the bromine solution environment is provided.

Description

technical field [0001] The invention belongs to the technical field of evaluating the corrosion resistance of a coating in a bromine solution, and in particular relates to a test method for evaluating the corrosion of a coating in a corrosion solution containing bromine. Background technique [0002] Bromide and chloride ions are common active anions in chemical production. They can be adsorbed on the metal surface in solution, thereby destroying the protective layer or passivation film on the surface of the material, causing pitting corrosion and intergranular corrosion of materials with good corrosion resistance. Corrosion and other localized corrosion, so that the equipment fails prematurely. Therefore, coating protection, as an economical and effective means of steel structure corrosion protection, has always attracted the attention of scholars at home and abroad, and the coatings required for different corrosion environments are not the same. Mainly reflected in the dif...

Claims

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Application Information

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IPC IPC(8): G01N17/00
Inventor 李春玲王培纪贤晶王志坤孙霜青王秀民胡松青
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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