LaCl3含量对Ni-P涂层耐腐蚀性能的影响  

Influence of LaCl3 Concentration on Corrosion Resistance of Ni-P Coating

作　　者：郭方 孙万昌[1] 张磊[2] 贾宗伟 刘晓佳 董亚茹 GUO Fang;SUN Wanchang;ZHANG Lei;JIA Zongwei;LIU Xiaojia;DONG Yaru(College of Materials Science and Engineering,Xi＇an University of Science and Technology,Xi＇an 710054,China;CSIC NO.12 Research Institute,Xingping 713102,China)

机构地区：[1]西安科技大学材料科学与工程学院,陕西西安710054 [2]中国船舶重工集团公司第十二研究所,陕西兴平713102

出　　处：《热加工工艺》2018年第18期147-149,153,共4页Hot Working Technology

基　　金：陕西省科技攻关项目(2014K08-09);国家自然科学基金资助项目(50172023);榆林市产学研科技计划项目(2012);陕西省教育厅专项计划资助项目(No.11JK0824)

摘　　要：在不同浓度的LaCl3镀液中,采用化学镀方法在镁合金基体表面制备Ni-P镀层。利用扫描电镜观察了Ni-P镀层的表面形貌,通过全腐蚀浸泡实验测出镀层的腐蚀速率,借助电化学测试了Ni-P镀层的腐蚀过电位及塔菲尔（Tafel）极化曲线。结果表明：Ni-P镀层表面形貌为胞状组织。随着镀液中LaCl3含量的增加,Ni-P镀层的耐蚀性提高,当LaCl3添加量为0.30 g/L时,Ni-P镀层的腐蚀速率最低,过腐蚀电位最正,容抗弧半径最大,耐蚀性最好;当LaCl3添加量为0.35 g/L时,反而会降低Ni-P镀层的耐蚀性。Ni-P coating was prepared on the surface of magnesium alloy by electroless plating with different LaCl3 concentration. The surface morphologies of the coating were observed with scanning electron microscopy（SEM）. The corrosion rate of the coating was measured by the immersion corrosion test. The corrosion potential and the polarization curves（Tafel） of the coating were tested by electrochemical method. The results show that the surface of morphology of Ni-P coating is cellular structure. With the increase of LaCl3 content in plating solution, the corrosion resistance of Ni-P coating improves. When the LaCl3 concentration is 0.30 g/L, the corrosion rate of the coating is the lowest, the over corrosion potential is the most positive, and the capacitive arc radius is the largest, and the corrosion resistance is the best. When LaCl3 addition is0.35 g/L, the corrosion resistance of Ni-P coating decreases.

关 键 词：稀土LaCl3 化学镀 NI-P镀层 耐蚀性 

分 类 号：TG174.44[金属学及工艺—金属表面处理]