摘要
为了进一步改善Ni-P化学镀层的耐蚀性,扩大化学镀层的应用范围,在Ni-P化学镀液中加入FeSO4,制备了Ni-Fe-P镀层。通过扫描电镜观察和分析了Ni-P和Ni-Fe-P镀层的表面形貌和成分,通过2273电化学设备测试了2种镀层在3.5%NaCl腐蚀溶液中的动电位极化和交流阻抗曲线。结果表明:Ni-Fe-P镀层比Ni-P镀层的晶粒更加细小、致密,表面质量更好,有利于减少腐蚀介质渗入;与Ni-P镀层相比,Ni-Fe-P镀层在腐蚀溶液中具有更正的腐蚀电位和更低的腐蚀电流密度,镀层的膜电阻和电荷转移电阻更高,腐蚀反应阻力更大,镀层的耐蚀性得到提高。
Electroless Ni-Fe-P coating was prepared by introducing FeSO4 into electroless Ni-P plating bath.The surface morphology and composition of electroless Ni-P and Ni-Fe-P coatings were observed using a scanning electron microscope.The dynamic potential polarization curves and electrochemical impedance spectra of both coatings in 3.5% NaCl solution were tested by means of a 2273 electrochemical test rig.Results show that Ni-Fe-P coating is composed of finer and more compact particles and has better surface quality as compared with Ni-P coating,which is beneficial to retarding the attack by corrosive medium and improving corrosion resistance.Ni-Fe-P coating immersed in 3.5% NaCl solution had a smaller corrosion current density and higher film resistance and charge transfer resistance than the Ni-P coating,showing improved corrosion resistance.
出处
《材料保护》
CAS
CSCD
北大核心
2011年第4期61-63,8-9,共3页
Materials Protection
关键词
Ni—Fe—P化学镀层
耐蚀性
动电位极化
交流阻抗
electroless Ni-Fe-P coating
corrosion resistance
dynamic potential polarization
electrochemical impedance
