Nd(NO_(3))_(3)的添加对TC4 MAO涂层润湿性和耐蚀性的影响  

Effect of Nd(NO_(3))_(3) on Wettability and Corrosion Resistance of TC4 MAO Coating

作　　者：王卓 张唯一 张云龙[1] 伊洪勇 李文博 李成海[1] 潘佳琦 杨涵崧[1] WANG Zhuo;ZHANG Wei-yi;ZHANG Yun-long;YI Hong-yong;LI Wen-bo;LI Cheng-hai;PAN Jia-qi;YANG Han-song(Collage of Materials Science and Engineering,Jiamusi University,Jiamusi 154007,China)

机构地区：[1]佳木斯大学材料科学与工程学院,黑龙江佳木斯154007

出　　处：《稀土》2021年第2期48-55,共8页Chinese Rare Earths

基　　金：黑龙江省教育厅科学研究项目(2016-KYYWF-0556)。

摘　　要：为了提高TC4合金的耐腐蚀性,尝试利用微弧氧化技术在TC4表面制备陶瓷涂层,探究微弧氧化电解液中Nd(NO3)3的添加对TC4微弧氧化(MAO)涂层表面性能的影响作用。在硅酸盐电解液体系下对TC4进行微弧氧化处理,测定获得的TiO_(2)MAO涂层相组成、三维轮廓形貌、表面粗糙度、接触角以及电化学极化曲线等性能参数。TC4表面涂层由锐钛矿相TiO_(2)和金红石相TiO_(2)组成。随着电解液中Nd(NO3)3添加量增加,TC4微弧氧化涂层中锐钛矿相TiO_(2)和金红石相TiO_(2)的含量加强。电解液中加入Nd(NO3)3能够促进TiO_(2)相的转化。当Nd(NO3)3添加量超过6‰时,涂层中出现腐蚀坑和非晶态物质。添加Nd(NO3)3后,涂层接触角呈现出先降低后升高的趋势,但均比未添加Nd(NO3)3接触角小,接触角在23°~61°范围内变化。与未添加Nd(NO3)3的涂层相比,添加Nd(NO3)3涂层的腐蚀电位正向移动。添加适当的Nd(NO3)3后涂层腐蚀电流下降在1~2个数量级,耐腐蚀性提高。In order to improve corrosion resistance of TC4 alloy,the ceramic coating was prepared on the surface of TC4 by micro-arc oxidation technology,and the influence of Nd(NO3)3 on the surface performance of TC4 micro-arc oxidation(MAO)coating was investigated.TC4 plates were treated with micro-arc oxidation under silicate electrolytic system and the obtained TiO_(2)MAO coating phase composition,3 D contour morphology,surface roughness,contact angle and electrochemical polarization curve were determined.The surface coating of TC4 was composed of anatase phase TiO_(2)and rutile phase TiO_(2).With the increase of Nd(NO3)3 in electrolyte,the content of anatase phase TiO_(2)and rutile phase TiO_(2)in TC4 micro-arc oxidation coating was enhanced.The addition of Nd(NO3)3 in the electrolyte could promote the conversion of TiO_(2)phase.When the addition content of Nd(NO3)3 exceeded 6‰,corrosion pits and amorphous substances appeared in the coating.After adding Nd(NO3)3,the contact angle of coating showed a trend of decreasing first and then increasing,but it was smaller than that without Nd(NO3)3,so the contact angle varied from 23°to 61°.Compared with that without Nd(NO3)3,the corrosion potential of TiO_(2)coating with Nd(NO3)3 addition moved in a positive direction.After adding appropriate amount of Nd(NO3)3,the corrosion current decreased in 1~2 orders of magnitude,so the corrosion resistance improved.

关 键 词：微弧氧化 接触角 粗糙度 极化曲线 稀土硝酸盐 

分 类 号：TG174.44[金属学及工艺—金属表面处理]