Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《腐蚀科学与防护技术》
Abstract： Corrosion behavior of electrogalvanized steel plate exposed to atmospheres at Qingdao located at the East coast of China and Xishuangbanna, an area of tropical rainforest climate, located at Yunnan province respectively for 2 a was investigated by means of weight- loss measurement, macro-morphology observation, SEM and XRD etc. The electrochemical behavior of the plate in solutions with different chloride concentration was studied by electrochemical impedance spectroscopy. The results showed that the corrosion rates of the steel exposed to the atmospheres at Qingdao and Xishuangbanna are 0.76 and 0.1935 μm/a respectively. Local red rust was observed on the surface of the steel plate exposed to Qingdao atmosphere, which consists of Zn5(OH)8Cl2H2O, ZnO and Zn(OH)2. In the atmosphere at Xishuangbanna, the main corrosion products are 2ZnCO3·3Zn(OH)2, ZnO and Zn(OH)2. Inhomogeneous general corrosion occurs in the two test areas and the electrogalvanized steel plate suffered more severely from corrosion in the atmosphere at Qingdao because of the influence of Cl-.
Subjects: Materials Science >> Materials Science (General) submitted time 2016-11-12 Cooperative journals: 《中国腐蚀与防护学报》
Abstract：通过实海暴露实验，研究了N6纯镍和Monel400镍合金在中国南海海域800米和1200米深海环境下的长周期（3年）腐蚀行为。采用SEM，EDS和XRD技术，分别进行了腐蚀形貌观察，腐蚀产物成分和相组成分析。结果表明：在深海环境下，Monel400镍合金的耐局部腐蚀能力要优于N6纯镍。N6纯镍在绿色腐蚀产物膜（由NiCl2?6H2O组成，还覆盖有少量的CaCO3、MgCO3等无机盐类）下面发生了很严重的隧道腐蚀，甚至出现了局部穿孔现象。Monel400镍合金表面生成了宽浅型的点蚀坑，点蚀坑上覆盖有由(CuNi)2Cl(OH)3组成的腐蚀产物。将本文中的实验结果与文献中同种合金的实验结果对比作图，表明N6纯镍和Monel400镍合金的最大点蚀坑深度均随水深的增加而降低。
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