摘要
采用扫描电镜、能谱、X射线衍射、塔菲尔曲线和电化学阻抗谱,研究了热处理对P110钢上化学镀高磷镍–磷合金层在饱和CO2盐水溶液中腐蚀行为的影响。结果表明,热处理使镀层的表面形貌、成分和结构发生了显著变化,但对镀层在饱和CO2盐水中的腐蚀电位影响不大。经200°C热处理后,镀层的腐蚀电流略有下降,而后随热处理温度的升高,腐蚀电流迅速增大。镀态及经200°C热处理的镀层以均匀腐蚀为主;而经400°C和600°C热处理的镀层阻抗谱呈现2个时间常数,有坑蚀发生。
The effect of heat treatment on CO2 corrosion behavior of high-phosphor electroless NiP alloy coating in NaCl solution was studied by electron scanning spectroscopy, energy-dispersive spectroscopy, X-ray diffraction, Tafel curve and electrochemical impedance spectroscopy. The results showed that heat treatment greatly affects the surface morphology, composition and microstructure of electroless NiP alloy coating, but has a slight effect on its corrosion potential in NaCl solution saturated with CO2. The corrosion current density is decreased slightly after heat treatment at 200 ℃, but increased greatly with further increasing heat treatment temperature over 200 ℃. The as-plated and 200 ℃ heat-treated Ni-P alloy coatings mainly undergo homogeneous corrosion. The electrochemical impedance spectra of NiP alloy coatings feature two time constants after heat treatment at 400 ℃ and 600 ℃, indicating the occurrence of pit corrosion.
出处
《电镀与涂饰》
CAS
CSCD
北大核心
2009年第4期16-19,共4页
Electroplating & Finishing
基金
石油管力学和环境行为重点实验室开放基金(GG200350)
关键词
镍—磷合金
化学镀
热处理
二氧化碳腐蚀
塔菲尔曲线
电化学阻抗谱
nickel-phosphorus alloy
electroless plating
heat treatment
carbon dioxide corrosion
Tafel curve
electrochemical impedance spectroscopy
