Electrodeposition and corrosion resistance of Ni-P-TiN composite coating on AZ91D magnesium alloy  

AZ91D镁合金Ni-P-TiN复合涂层的电沉积制备及其耐蚀性能（英文）

作　　者：周亚茹[1] 张珊[1] 聂林林 朱泽洁 张鉴清[1] 曹发和[1] 张俊喜[2] 

机构地区：[1]浙江大学化学系,杭州310027 [2]上海电力学院上海市电力材料防护与新材料重点实验室,上海200090

出　　处：《Transactions of Nonferrous Metals Society of China》2016年第11期2976-2987,共12页中国有色金属学报（英文版）

基　　金：Projects(51171172,51131005)supported by the National Natural Science Foundation of China;Project(R16E010001)supported by Zhejiang Provincial Natural Science Foundation of China;Project(2015QNA3011)supported by Fundamental Research Funds for the Central Universities,China;Project(14DZ2261000)supported by Science and Technology Commission of Shanghai Municipality,China

摘　　要：In order to improve the corrosion resistance and microhardness of AZ91D magnesium alloy, TiN nanoparticles were addedto fabricate Ni-P-TiN composite coating by electrodeposition. The surface, cross-section morphology and composition wereexamined using SEM, EDS and XRD, and the corrosion resistance was checked by electrochemical technology. The results indicatethat TiN nanoparticles were doped successfully in the Ni-P matrix after a series of complex pretreatments including activation, zincimmersion and pre-electroplating, which enhances the stability of magnesium alloy in electrolyte and the adhesion betweenmagnesium alloy and composite coating. The microhardness of the Ni-P coating increases dramatically by adding TiN nanoparticlesand subsequent heat treatment. The corrosion experimental results indicate that the corrosion resistance of Ni-P-TiN compositecoating is much higher than that of uncoated AZ91D magnesium alloy and similar with Ni-P coating in short immersion time.However, TiN nanoparticles play a significant role in long-term corrosion resistance of composite coatings.为了提高AZ91D镁合金的耐蚀性能和显微硬度,通过电沉积方法制备Ti N纳米粒子掺杂的Ni-P-Ti N复合涂层。应用扫描电镜、能谱和XRD等手段研究涂层的表面、界面形貌和显微组成,并结合电化学方法研究涂层的耐蚀性能。研究结果表明,经过活化、浸锌和预镀层等系列复杂前处理,可有效提高镁合金在电镀液中的稳定性和涂层结合力,Ti N纳米粒子可以通过电沉积方式掺杂至Ni-P基体中。Ti N纳米颗粒和后续热处理可以有效提高Ni-P涂层的显微硬度。腐蚀结果表明Ni-P-Ti N复合涂层的耐蚀性能比裸AZ91D镁合金大幅增加。在短期浸泡内,Ni-P-Ti N的耐蚀性能与没有Ti N纳米粒子掺杂的Ni-P涂层相当,但Ti N纳米粒子对于提高复合涂层长期耐蚀性能具有重要影响。

关 键 词：AZ91D composite coating TiN nanoparticle ELECTRODEPOSITION corrosion resistance 

分 类 号：TG174.4[金属学及工艺—金属表面处理] TQ153[金属学及工艺—金属学]