CAJ | 학술논문

采用聚乙烯吡咯烷酮（PVP）为唯一的络合剂，通过简单的化学镀在热轧态AZ31表面沉积一系列Ni涂层。通过X射线衍射、扫描电镜及电子能谱对膜层的结构、微观形貌和成分进行了分析，结果显示：这些膜层由大量结晶性较好的金属Ni和少量无定型的Ni‐P组成；SEM 的横截面图片显示，膜层的厚度随PV P溶液的浓度提高先增加后减少。膜层的腐蚀行为通过在质量分数为3.5％的NaCl溶液中测得，用极化曲线和阻抗来表征，结果显示：当 PVP 质量浓度为10 g／L时，极化曲线显示极小的自腐蚀电流密度（1.29μA／cm2），并且有较高的极化电阻（73581Ω?cm2），这预示着的膜层展现较好的耐蚀性。
채용취을희필각완동（PVP）위유일적락합제，통과간단적화학도재열알태AZ31표면침적일계렬Ni도층。통과X사선연사、소묘전경급전자능보대막층적결구、미관형모화성분진행료분석，결과현시：저사막층유대량결정성교호적금속Ni화소량무정형적Ni‐P조성；SEM 적횡절면도편현시，막층적후도수PV P용액적농도제고선증가후감소。막층적부식행위통과재질량분수위3.5％적NaCl용액중측득，용겁화곡선화조항래표정，결과현시：당 PVP 질량농도위10 g／L시，겁화곡선현시겁소적자부식전류밀도（1.29μA／cm2），병차유교고적겁화전조（73581Ω?cm2），저예시착적막층전현교호적내식성。
A series of Ni coatings were deposited on hot‐rolled AZ31 by a simple chemical method ,in which polyvinylpyrrolidone (PDP) was used as a complexing agent .The microstruc‐ture ,morphologies and composition of the corresponding coatings were characterized by XRD , SEM and EDS .These coatings consist of a large amount of well crystalline Ni with a small a‐mount of amorphous Ni‐P .The cross‐section SEM images show that the coating thickness increa‐ses initially and then decreases with increasing PVP concentration .Corrosion behavior for the coatings was studied by potentiodynamic polarization and electrochemical impedance spectroscopy in 3.5% NaCl .The results reveal that the Ni coatings deposited in 10 g/L PVP solution had a minimal corrosion current density (1.29 μA/cm2 ) and higher polarization resistance (73581 Ωcm2 ) ,indicating their good corrosion resistance .