目的 探究84消毒液对304不锈钢腐蚀行为的影响及其腐蚀机理。方法 采用数码相机和三维视频显微镜对304不锈钢进行宏观与微观腐蚀形貌观察,结合电化学测试分析研究84消毒液对304不锈钢腐蚀行为的影响。结果 在喷洒试验初期,在不锈钢表面可观察到少量较浅的点蚀坑生成,腐蚀电位升高,腐蚀电流密度下降。随着喷洒时间的延长,试验后期,点蚀坑增加和变大,腐蚀电位降低,腐蚀电流密度提高,304不锈钢的耐腐蚀性能降低,腐蚀速率提高。结论 大气环境下喷洒84消毒液,304不锈钢发生局部腐蚀。试验初期,NaClO促进了不锈钢钝化膜的形成,腐蚀速率下降。随着喷洒时间的延长,NaClO被还原形成的Cl-,使钝化膜发生破裂,促进了不锈钢的点蚀。
Abstract
The work aims to explore the corrosion behavior and mechanism of 304 stainless steel (304SS) in 84 disinfectant. The macroscopic and microscopic corrosion morphology of 304 stainless steel was observed by digital camera and three-dimension microscope. The effect of 84 disinfectant on corrosion behavior of 304 stainless steel was studied in combination with electrochemical analysis. At the initial stage of spraying experiment, a small number of shallow pitting pits could be observed on the stainless steel surface, the corrosion potential increased, and the corrosion current density decreased. With the extension of spraying time, in the later period of the experiment, the pitting pit increased and became larger, the corrosion potential decreased, the corrosion current density increased, the corrosion resistance of 304 stainless steel decreased, and the corrosion rate increased. When spraying 84 disinfectant in atmospheric environment, 304 stainless steel has local corrosion. At the beginning of the experiment, NaClO promotes the formation of stainless steel passivation films, and the corrosion rate decreases. With the extension of spraying time, the reduction of NaClO to Cl- causes the passivation film to break and promotes the pitting corrosion of stainless steel.
关键词
84消毒液 /
304不锈钢 /
腐蚀 /
次氯酸钠 /
点蚀
Key words
84 disinfectant /
304 stainless steel /
corrosion /
NaClO /
pitting corrosion
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基金
广东省自然科学基金项（2021A1515012129）; 湛江市科技发展专项（2022A01029）
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