摘要
基体表面粗糙度影响着化学镀镍层的耐蚀性。使用扫描电镜观察了不同基体表面粗糙度时镀层的表面形貌,采用动电位极化和交流阻抗等技术考察了基体表面粗糙度对镀层耐蚀性的影响。结果表明:当Q345钢基体表面粗糙度为1.81μm时,表面沉积的Ni-P化学镀层的胞状物大小不一,镀层的平整性差,自腐蚀电流密度大,腐蚀速率相对较高;当基体表面粗糙度下降到0.39μm和0.17μm时,镀层表面胞状物的大小趋于一致,且镀层的平整性提高,镀层更容易发生钝化,自腐蚀电流密度下降,耐蚀性得到了改善。
The surface roughness of substrate affects the corrosion resistance of electroless nickel coating.The surface morphology of the coating obtained at different substrate surface roughnesses was observed using scanning electron microscope （SEM）,and the effects of the substrate surface roughness on the corrosion resistance of the coating were inspected by potentiodynamic polarization and electrochemical impedance and other methods.The results show that the grains of the electroless Ni-P coating prepared on the surface of Q345 steel with 1.81 μm surface roughness are uneven in size,the coating smoothness is poor,the self-corrosion current density is high,and the corrosion rate is relatively higher too; when the substrate surface roughness decreases to 0.39 μm and 0.17 μm,the coating surface cellular object size tends to be consistent,the coating smoothness is also improved,the coating passivation is easier to occur,and the self-corrosion current density decreases,as a result the corrosion resistance is improved.
出处
《电镀与环保》
CAS
CSCD
北大核心
2014年第6期18-20,共3页
Electroplating & Pollution Control
关键词
表面粗糙度
化学镀
耐蚀性
surface roughness
electroless plating
corrosion resistance
