镍基合金镀层在北方老工业城市冬季降水中的腐蚀行为 |
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作者姓名: | 史艳华 梁平 陈吉 张国福 武占文 孙冬来 |
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作者单位: | 辽宁石油化工大学机械工程学院, 抚顺 113001 |
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摘 要: | 为研究镍基合金镀层在北方老工业城市冬季降水中的腐蚀行为,采用电沉积技术制备了Ni-P、Ni-Fe合金镀层,对其结构与耐蚀性能进行检测.结果表明:不同镍基合金镀层在冬季降水中耐蚀性能不同,其中Ni-Fe合金镀层由于Fe掺杂增加了镍基合金与氧的亲和力,可以快速在Ni-Fe合金镀层表面形成一层连续的氧化膜,对基体起到很好的防护作用,电位最正,自腐蚀电流密度值最小,耐蚀性较好,年腐蚀速率约为20号钢的1/2;而Ni-P合金镀层表面形成氧化膜的速率较缓慢,阻抗值较低,不适合在北方老工业城市的室外装饰与防护中应用.
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关 键 词: | 镍合金 镀层 冬季降水 腐蚀 电化学阻抗谱 极化 |
收稿时间: | 2011-07-20 |
Corrosion behavior of nickel base alloy coatings in the winter precipitation contamination of Chinese north old industrial city |
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Affiliation: | School of Mechanical Engineering, Liaoning Shihua University, Fushun 113001, China |
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Abstract: | In order to study the corrosion behavior of nickel-based alloy coatings in the winter precipitation of Chinese north old industrial city,Ni-P and Ni-Fe coatings were prepared by electrodeposition,and the phase structure and corrosion resistance of the nickel coatings were examined.Experimental results show that the corrosion resistances of different nickel coatings are different.The Ni-Fe coating has a nobler potential,a lower corrosion current density and a better corrosion resistance.Its corrosion rate is about half of 20 Steel's one.This is because that Fe in the nickel coating has a greater affinity with oxygen and can form a continuous oxide film quickly on the surface of the Ni-Fe coating.But the oxide film on the Ni-P coating forms slowly and its impedance resistance is lower than that of the Ni-Fe coating.Thus the Ni-P coating is not suitable to be used for outdoor decoration and corrosion protection in Chinese north old industrial city. |
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