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Corrosion simulation method and corrosion resistance evaluation method of galvanized steel coating in industrial atmosphere environment

A technology of atmospheric environment and simulation methods, applied in the fields of weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc.

Inactive Publication Date: 2016-01-27
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no standardized and standard method for evaluating the corrosion resistance of galvanized sheets in industrial atmospheric environments. Therefore, it is of great practical significance to carry out research on the corrosion resistance of galvanized sheets in industrial atmospheric environments and establish a standardized evaluation method.

Method used

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  • Corrosion simulation method and corrosion resistance evaluation method of galvanized steel coating in industrial atmosphere environment
  • Corrosion simulation method and corrosion resistance evaluation method of galvanized steel coating in industrial atmosphere environment
  • Corrosion simulation method and corrosion resistance evaluation method of galvanized steel coating in industrial atmosphere environment

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Experimental program
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Effect test

Embodiment 1

[0024] Tests were carried out on three groups of samples E, I, and J, and the corrosion resistance of the coating was judged by the corrosion rate of the zinc coating. Take samples according to the set test period, conduct rust removal treatment analysis, calculate corrosion weight loss, and end the test before red rust appears. The atmospheric corrosion weight loss ΔW of zinc and the corrosion time t conform to the linear law ΔW=At+B, and the constant terms A and B depend on the test environment and test materials. figure 1 The fitting straight lines and test data points of the corrosion weight loss and corrosion time of the E, I, J groups of samples in the simulated industrial atmospheric environment are given. The linear fitting correlation coefficients of these three galvanized steels are all above 0.99, indicating that the fitting correlation is very good. The specific fitting parameters are as follows:

[0025] E: ΔW = 1.1164t-0.8711, R 2 =0.993;

[0026] I: ΔW = 1.1...

Embodiment 2

[0030] Tests were carried out on five groups of samples of G, H, I, J, and K provided by Steel Plant B, and the corrosion resistance of the coating was judged by the time and area of ​​red rust on the galvanized steel. The macroscopic photos of the five groups of samples corroded for different times (24h, 48h, 72h) are as follows: figure 2 shown. from figure 2 It can be seen that the corrosion time for red rust to appear on different galvanized steels is different. The samples of Groups G and H appeared red rust after 24 hours of corrosion, but the area of ​​red rust appeared in the samples of Group H was relatively small; Group J appeared a small amount of red rust when corroded for 48 hours; Group I appeared a small amount of red rust when corroded for 72 hours , K group samples still did not see red rust when corroded to 72h. The protective effect of the coating is judged according to the time when the red rust appears on the galvanized steel, and the red rust appears ...

Embodiment 3

[0032]Tests were carried out on six groups of samples A, B, C, D, E, and F provided by Steel Plant A, and the corrosion resistance of the coating was judged by the time and area of ​​red rust on the galvanized steel. The macroscopic photos of the six groups of samples corroded for different times (24h, 48h, 72h) are as follows: image 3 shown. from image 3 It can be seen that the corrosion time or red rust area of ​​different galvanized steels is different. The samples of groups B, C, D, and F all showed red rust when they were corroded for 24 hours. Among them, the areas of red rust in groups B and C were similar, and the areas of red rust in groups D and F were similar. The areas of red rust in groups B and C were slightly larger than Groups D and F; red rust appeared in group A when corroded for 48 hours; red rust appeared in group E when corroded for 72 hours. According to the time and area of ​​red rust on galvanized steel to judge the corrosion resistance of the coat...

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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 [0001] The invention relates to the technical field of atmospheric corrosion simulation and evaluation of galvanized steel, in particular to a corrosion simulation method and a corrosion resistance evaluation method of a galvanized steel coating in an industrial atmospheric environment. Background technique [0002] During the use and service of metal materials, corrosion will inevitably occur due to chemical, electrochemical or physical interactions with the environment, such as rusting of steel. Due to the spontaneity and pervasiveness of corrosion, huge economic losses are caused. In order to improve the corrosion resistance and service life of steel and reduce the loss caused by corrosion, researchers have developed a variety of methods to improve the corrosion resistance of steel. Among them, the galvanizing protection method has been widely used due to its remarkable effect, relatively simple process, and low price. [0003] The standard electrode pot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00
Inventor 吕旺燕王振尧钟西舟苏伟韩薇刘世念
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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