2024铝合金浸镍层的制备及生长过程  

Preparation and growth processes of nickel-immersed coating on 2024 aluminum alloy

作　　者：高旭 陈海宁[1] 韩东晓 刘慧丛[1] 朱立群[1] 李卫平[1] GAO Xu;CHEN Haining;HAN Dongxiao;LIU Huicong;ZHU Liqun;LI Weiping(National Experiment and Teaching Demonstration Center for Materials Science and Engineering,School of Materials Science and Engineering,Beihang University,Beijing 100083,China;Beijing Shiny Tech.Co.Ltd.,Beijing 100854,China)

机构地区：[1]北京航空航天大学材料科学与工程学院,材料科学与工程国家级实验教学示范中心,北京100083 [2]北京航天新立科技有限公司,北京100854

出　　处：《北京航空航天大学学报》2021年第8期1673-1678,共6页Journal of Beijing University of Aeronautics and Astronautics

基　　金：国家重点研发计划(2018YFB2002000);国家自然科学基金(U1637204,51971012)。

摘　　要：利用磷酸的全面腐蚀特性和氯离子的活化作用,设计了磷酸-氯化镍浸镍反应体系,通过表面电位监测及微观形貌表征对不同磷酸浓度与反应温度下的浸镍过程进行分析。结果表明:磷酸浓度是影响浸镍层表面电位及微观形貌的关键因素,当磷酸浓度为25%,反应温度为30℃时,可制得化学性质稳定、包覆性良好且晶粒尺寸均匀的浸镍层。在此反应体系下,浸镍层在形核后通过球状方式叠层生长,在反应进行600 s后得到厚度约1μm的浸镍层,其表面电位可达到-0.51 V左右。A phosphoric acid-nickel chloride reaction system was designed by utilizing the comprehensive corrosion properties of phosphoric acid and the activation effect of chloride ions. By characterizing surface potential and microscopic morphology, the nickel immersion process was analyzed at different phosphoric acid concentration and temperature. The result shows that the concentration of phosphoric acid is a key factor affecting the surface potential and morphology of the nickel-immersed coating. When the concentration of phosphoric acid is 25% and the temperature is 30℃, nickel-immersed coating with stable chemical properties, good coating and uniform grain size can be prepared. In this reaction system, the nickel-immersed coating grows in a spherical manner after nucleation. After reacting for 600 s, a nickel-immersed coating with a thickness of about 1 μm is obtained, and its surface potential can reach about-0.51 V.

关 键 词：铝合金 镀前预处理 浸镍 磷酸 表面电位 

分 类 号：TG146.2[一般工业技术—材料科学与工程]