Effect of chloride ion content on pitting corrosion of dispersion-strengthened-high-strength steel

Corrosion Communications Pub Date : 2022-09-01 DOI:10.1016/j.corcom.2022.03.005

Ping Li, Min Du

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引用次数: 13

Abstract

Chloride ion is an important corrosion factor in marine environment. Chloride ion has a small radius and strong permeability, which can destroy the oxide film on the surface of marine structural steel. The uneven adsorption of chloride ion on the metal surface will cause pitting corrosion. The effect of chloride ion content on pitting corrosion of the as-cast and heat-treated Dispersion-Strengthened-High-Strength (DSHS) steel was studied by electrochemical test, composition analysis and surface analysis. The results showed that high content of chloride ion reduced the content of dissolved oxygen in the solution, and the corrosion rate of DSHS steel was the slowest in 5.0 wt.% NaCl solution. In high content chloride ion solution, the formation of α-FeOOH was inhibited and the protection of corrosion products was weakened. Pitting corrosion of DSHS steel before and after heat treatment was the most serious in 2.0 wt.% NaCl solution. After heat treatment, grain size of DSHS steel decreased, and more dense and stable protective corrosion products were produced. Therefore, the induction and development of pitting corrosion of heat-treated DSHS steel were inhibited.

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氯离子含量对分散强化高强钢点蚀的影响

氯离子是海洋环境中重要的腐蚀因子。氯离子半径小，渗透性强，能破坏海洋结构钢表面的氧化膜。氯离子在金属表面的不均匀吸附会引起点蚀。通过电化学试验、成分分析和表面分析，研究了氯离子含量对铸态和热处理分散强化高强钢点蚀的影响。结果表明:高氯离子含量降低了溶液中溶解氧的含量，在5.0 wt.% NaCl溶液中，DSHS钢的腐蚀速度最慢;在高含量氯离子溶液中，α-FeOOH的生成受到抑制，腐蚀产物的保护作用减弱。在2.0 wt.% NaCl溶液中，DSHS钢在热处理前后的点蚀最为严重。热处理后，DSHS钢的晶粒尺寸减小，产生更致密、更稳定的防护腐蚀产物。因此，热处理后的DSHS钢点蚀的产生和发展受到抑制。

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来源期刊

Corrosion Communications

CiteScore

7.30

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0.00%

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