Research on citric acid passivation parameters and corrosion resistance performance of SCM435 steel for fasteners

IF 4.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics Pub Date : 2025-09-19 DOI:10.1016/j.matchemphys.2025.131553

Shuai Wang , Yuexin Zhang , Zhijun He , Ying Liu , Xiaolin Sun , Xin Li , Hongxuan Pang

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Abstract

In this study, citric acid is used to passivate SCM435 steel, which can be regarded as an ideal anti-corrosion solution in the field of ship engineering. The experiment focused on investigating the effects of citric acid dosage, hydrogen peroxide concentration, passivation temperature and time on the surface morphology and corrosion resistance of the passivation film. The results show that the optimal citric acid passivation process is: 15 wt% citric acid, H₂O₂ 16 wt%, passivation temperature of 40 °C and treatment time of 50 min (F4). After the F4 treatment, a large number of dense and uniform irregular particles formed on the surface of SCM435 steel. The chromium content in the passivation layer is significantly higher than that of the substrate, while the iron content is comparatively lower. Moreover, a passivation film of Cr/Fe oxides or hydroxides was formed on the surface of the steel. After the FeCl₃ pitting test, the corrosion rate ratio decreased to 0.24. Compared with the un-passivated counterparts, the corrosion current density and corrosion rate of the passivated SCM435 steel are markedly reduced (F4), exhibiting excellent corrosion resistance.

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紧固件用SCM435钢柠檬酸钝化参数及耐腐蚀性能研究

本研究采用柠檬酸对SCM435钢进行钝化处理，是船舶工程领域一种理想的防腐溶液。实验重点考察了柠檬酸用量、过氧化氢浓度、钝化温度和时间对钝化膜表面形貌和耐蚀性的影响。结果表明，柠檬酸钝化的最佳工艺为：柠檬酸15 wt%， H2O2 16 wt%，钝化温度40℃，处理时间50 min （F4）。F4处理后，SCM435钢表面形成大量致密均匀的不规则颗粒。钝化层中的铬含量明显高于基体，而铁含量相对较低。此外，在钢表面形成了一层Cr/Fe氧化物或氢氧化物的钝化膜。经FeCl3点蚀试验后，腐蚀速率比降至0.24。与未钝化钢相比，钝化后的SCM435钢的腐蚀电流密度和腐蚀速率明显降低（F4），表现出优异的耐蚀性。

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来源期刊

Materials Chemistry and Physics 工程技术-材料科学：综合

CiteScore

8.70

自引率

4.30%

发文量

1515

审稿时长

69 days

期刊介绍： Materials Chemistry and Physics is devoted to short communications, full-length research papers and feature articles on interrelationships among structure, properties, processing and performance of materials. The Editors welcome manuscripts on thin films, surface and interface science, materials degradation and reliability, metallurgy, semiconductors and optoelectronic materials, fine ceramics, magnetics, superconductors, specialty polymers, nano-materials and composite materials.