Comparative study on periodic immersion+infrared aging corrosion behavior of Q345qNH steel and Q420qNH steel in simulated industrial atmospheric environment medium Korrosionsverhalten der Stähle Q345qNH und Q420qNH bei zyklischer Immersion und Infrarotalterung in einem simulierten industriellen atmosphärischen Medium

IF 1.2 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materialwissenschaft und Werkstofftechnik Pub Date : 2024-08-02 DOI:10.1002/mawe.202300248

T. Guo, H. Yang, W. Wu, X. Liu, X. Nan, Y. Hu

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Abstract

The corrosion behavior of Q345qNH steel and Q420qNH steel in simulated industrial atmospheric environment medium was studied by periodic immersion+infrared aging corrosion experiment. The results show that the corrosion type of both samples is uneven comprehensive corrosion, and the rust layer formed in the later stage of corrosion is relatively dense. But average corrosion rate of Q345qNH steel is always lower than that of Q420qNH steel, and the ratio of I_α-FeOOH/I_γ-FeOOH in rust layer is always higher. Compared with Q420qNH steel, Q345qNH steel has fewer surface pits but deeper local pits. The self-corrosion potential of Q345qNH steel increases obviously, the resistance of the rust layer is larger, and protection to the matrix is stronger. This is because the formation of a large number of corrosion microcells induced by fine lamellar sorbite tissue that uneven distributed in Q420qNH steel, which increases the corrosion rate and makes corrosion uneven, while the larger pearlitic group in Q345qNH steel increases the local corrosion rate. However, the higher chromium/carbon ratio in Q345qNH steel promotes the conversion of lepidocrocite to goethite and inhibits the cathode reaction in the infrared drying stage, improving the density and stability of the rust layer.

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Q345qNH 钢和 Q420qNH 钢在模拟工业大气环境介质中的周期性浸泡+红外老化腐蚀行为比较研究 Q345qNH 钢和 Q420qNH 钢在模拟工业大气环境介质中的周期性浸泡和红外老化腐蚀行为研究

通过周期性浸泡+红外老化腐蚀实验研究了 Q345qNH 钢和 Q420qNH 钢在模拟工业大气环境介质中的腐蚀行为。结果表明，两种试样的腐蚀类型均为不均匀的全面腐蚀，腐蚀后期形成的锈层相对致密。但 Q345qNH 钢的平均腐蚀速率始终低于 Q420qNH 钢，锈层中 Iα-FeOOH/Iγ-FeOOH 的比值始终较高。与 Q420qNH 钢相比，Q345qNH 钢的表面凹坑较少，但局部凹坑较深。Q345qNH 钢的自腐蚀潜能明显增加，锈层的阻力更大，对基体的保护更强。这是因为 Q420qNH 钢中分布不均匀的细小片状索氏体组织诱导形成了大量的腐蚀微胞，从而增加了腐蚀速率并使腐蚀不均匀，而 Q345qNH 钢中较大的珠光体基团则增加了局部腐蚀速率。然而，Q345qNH 钢中较高的铬/碳比促进了鳞片闪长岩向闪长岩的转化，抑制了红外干燥阶段的阴极反应，提高了锈层的致密性和稳定性。

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来源期刊

Materialwissenschaft und Werkstofftechnik 工程技术-材料科学：综合

CiteScore

2.10

自引率

9.10%

发文量

154

审稿时长

4-8 weeks

期刊介绍： Materialwissenschaft und Werkstofftechnik provides fundamental and practical information for those concerned with materials development, manufacture, and testing. Both technical and economic aspects are taken into consideration in order to facilitate choice of the material that best suits the purpose at hand. Review articles summarize new developments and offer fresh insight into the various aspects of the discipline. Recent results regarding material selection, use and testing are described in original articles, which also deal with failure treatment and investigation. Abstracts of new publications from other journals as well as lectures presented at meetings and reports about forthcoming events round off the journal.