Ni-W-Fe-P四元合金镀层在酸碱盐溶液中的腐蚀行为  

Corrosion Behavior of Ni-W-Fe-P Quaternary Alloy Coating in Acid,Alkali and Salt Solutions

作　　者：张云霞[1] 赫志晗 

机构地区：[1]辽宁石油化工大学继续教育学院,辽宁抚顺113001 [2]辽宁石油化工大学机械工程学院,辽宁抚顺113001

出　　处：《电镀与环保》2017年第6期29-32,共4页Electroplating & Pollution Control

摘　　要：在Ni-W-P合金镀液中加入硫酸亚铁,并通过适当的工艺在Q235钢表面制备了Ni-W-FeP四元合金镀层。采用扫描电子显微镜观察了镀层的表面形貌,通过能谱仪测试了镀层中各元素的质量分数,通过X射线衍射仪分析了镀层的结构,并借助极化曲线和交流阻抗曲线方法考察了镀层和Q235钢在体积分数为5%的H2SO4溶液、质量分数为5%的NaOH溶液和质量分数为3.5%的NaCl溶液中的腐蚀行为。结果表明:Ni-W-Fe-P合金镀层为非晶态结构,表面较为均匀,W和Fe的质量分数分别约为2.71%和1.56%。在上述三种腐蚀介质中,镀层的耐蚀性远优于Q235钢的,主要是镀层在酸、碱、盐介质中表面形成钝化膜所致。Ni-W-Fe-P quaternary alloy coating was prepared on the surface of Q235 steel through adding ferrous sulfate into the Ni-W-P plating solution. The surface morphology was observed using scanning electron microscope, the mass fraction of each element was tested using energy disperse spectroscopy, the structure was analyzed by X-ray diffraction, and the corrosion behavior of alloy coating and Q235 steel in 5% （volume fraction） H2SO4, 5% （mass fraction） NaOH and 3. 5% （mass fraction） NaCl solution was tested by means of potentiodynamic polarization curve and electrochemical impedance spectroscopy method. The results showed that Ni-W-Fe-P alloy coating was amorphous, the surface was uniform, and the mass fraction of W element and Fe element was about 2.71% and 1.56% respectively. The corrosion resistance of alloy coating was far better than that of Q235 steel in the three kinds of corrosive medium, which was mainly because of passivation film formed on the surface of alloy coating in acid, alkali and salt solutions.

关 键 词：化学镀 Ni-W-Fe-P四元合金镀层 耐蚀性 

分 类 号：TG174[金属学及工艺—金属表面处理]