摘要
采用中性盐雾试验法和电化学试验法对锌镍合金镀层的耐蚀性进行了研究。通过X射线衍射、辉光放电光谱、扫描电镜等分析手段,对锌镍合金镀层的成分变化规律、微观形貌和结构以及腐蚀产物进行研究。结果表明:随镀层厚度的增加,锌的含量不断增加,镍的含量是先增加后减小,镀层中形成了镍的富积层;含镍量不同,镀层的结构不同。含镍量在5%以下的锌镍合金主要是η相,含镍量在79%以上的锌镍合金主要是α相。其余范围内,锌镍合金镀层的相结构体现出很复杂的结构特征。经过钝化处理后锌镍合金镀层耐蚀性远高于镀锌钝化、镀隔钝化和镉钛合金镀层;锌镍合金镀层腐蚀产物主要是ZnO和ZnCl2.4Zn(OH)2,含有少量的2ZnCO3.3Zn(OH)2。
The corrosion resistance of a zinc-nickel alloy had been studied by electrochemical testing and neutral salt spray testing. The coating components, microcosmic appearance, structure and corrosion products of zinc-nickel alloy had been analyzed by means of XRD, Glow Discharge Optical Emission Spectrometry and SEM. When the thickness of zinc-nickel alloy coatings increased, the content of zinc increased, but the content of nickel increased at first and then decreased. There was enrichment of nickel in the coating. Zinc-nickel alloy electrodeposit exhibited different phases as a function of their alloy compositioru When the content of nickel was less then 5 %, the alloy was composed maily of ηphrase which is a solid solution of nickel in zinc. When the content of nickel exceeded 79%, the alloy was composed maily of a-phrase. In other ranges, zinc-nickel alloy exhibited sophisticated phases. The corrosion resistance of passivated zinc-nickel alloy was much more better than that of passivated zinc coatings, passivated cadmium coatings and alloys of cadmium-titanium. The corrosion products were mainly ZnO and ZnCl2 . 4Zn（OH）2, with little 2ZnCO3.3Zn（OH）2.
出处
《腐蚀与防护》
CAS
北大核心
2006年第11期552-554,共3页
Corrosion & Protection
基金
中国石油天然气集团公司石油管力学和环境行为重点实验室开放项目资助
关键词
锌镍合金
耐腐蚀性
合金电沉积
Zinc-nickel alloy
Corrosion resistance
Alloy eloctrodeposition
