摘要
对用复合电镀法电镀不锈钢镀层进行了研究。将金属铬微粒充分悬浮于硫酸盐型高铁铁镍二元合金镀液中,进行复合电镀,当控制镀液中Fe^(2+)/Ni^(2+)比值为2:3、铬微粒悬浮量200g/L、添加剂20mg/L时,镀得了成分类似于304不锈钢的69Fe-16Ni-15Cr的复合镀层。该复合镀层在氮气气氛中于950C下热处理4至16h时,发现其结构由单一的α相转变为以r相为主的r+α+[Fe,Cr]_(23)C_6的混合组织。经如此热处理16h后的复合镀层,其抗腐蚀能力与冶炼304不锈钢的相接近,在3％NaCl水溶液中,测得其腐蚀速度仅稍高于304不锈铜的腐蚀速度。改变热处理方法将有可能进一步改善复合镀层的性能。
Electroplating of stainless steel coatings with composite electroplating technique was investigated. The experimental results show that(Fe-Ni)-Cr composite coatings can be obtained from a high iron Fe-Ni binary alloy plating bath with the sufficient suspension of Cr particles in the bath. A composite coating with composition of 69Fe-16Ni-15Cr which is similar to that of 304 stainless steel was obtained under the conditions of Fe^(2+)/Ni^(2+)ratio 2:3, Cr particle suspension amount 200g/L and additive addition 20mg/L in the bath. It was found that after heat treatment at 950 C in N_2 atmosphere for 4 to 16h the structure of the composite coating changed from a single α phase structure to a mixed structure of r+a+[Fe, Cr]_(23)C_6 with r as the main phase. After thus heat treatment for 16h, the corrosion resistance of the composite coating is close to that of 304 stainless steel. The corrosion rate of the composite coating in 3% NaCl solution is only a little higher than that of 304 stainless steel. The performance of the composite coating may probably be improved if the heat treatment process is varied.
出处
《电镀与精饰》
CAS
1991年第1期4-7,共4页
Plating & Finishing
关键词
复合电镀
不锈钢
镀层
电镀
Composite Electroplating,Stainless Steel,Coating
