NH_(4)VO_(3)浓度对铝合金微弧氧化热控膜层结构和性能的影响  

Effect of NH_(4)VO_(3)concentration on microstructure and properties of thermal control coatings fabricated by micro-arc oxidation on aluminum alloys

作　　者：李正强 马颖[1] 欧凯奇 安晓丽 衡志丹 王晟[1] LI Zheng-qiang;MA Ying;OU Kai-qi;AN Xiao-li;HENG Zhi-dan;WANG Sheng(State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050

出　　处：《兰州理工大学学报》2025年第2期1-7,共7页Journal of Lanzhou University of Technology

基　　金：甘肃省创新研究群体计划(1111RJDA011)。

摘　　要：在以磷酸盐-硅酸盐复合盐系为基础的电解液中,加入不同浓度的着色盐NH_(4)VO_(3),探讨其浓度变化对微弧氧化膜层宏观形貌、黑度、微观结构、物相组成、耐蚀性以及热控性能的影响.结果表明:随着NH_(4)VO_(3)浓度的增加,膜层黑度值逐渐减小,颜色加深,但当其浓度超过临界值时,膜层成膜性变差.使膜层呈现黑色的原因是V_(2)O_(3)物相的生成.NH_(4)VO_(3)的加入使得黑色膜出现了自封孔现象,从而使得膜层的耐蚀性得到明显改善.黑色膜的电化学耐蚀性比基体和未加着色盐的膜层分别提高了5个和3个数量级.膜层吸收率最大为0.927,发射率最大为0.882.黑色膜层的热控性能和耐蚀性得到了同时提升.The effects of different concentrations of NH_(4)VO_(3)coloring agent on the morphology,darkness,microstructure,phase composition,corrosion resistance,and thermal control properties of the micro-arc oxidation(MAO)coatings were investigated by incorporating varying concentrations of NH_(4)VO_(3)coloring agent into the electrolyte based on the phosphate-silicate solution system.The results demonstrated that as the concentration of NH_(4)VO_(3)increases,the darkness of the coating gradually decreases while its color intensifies.However,when the concentration exceeds a critical value,coating formation deteriorates.The black appearance of the coating is attributed to V_(2)O_(3)phase formation.The addition of NH_(4)VO_(3)promotes a self-sealing micro-pore phenomenon in the black coating,significantly enhancing its corrosion resistance.Electrochemical detection revealed that corrosion resistance of the black coatings is 5 and 3 orders higher than that of both substrate and non-colored coatings,respectively.Moreover,maximum absorptance and emittance values for the black coatings are measured as 0.927 and 0.882,respectively.Both thermal control and corrosion resistance properties for a black coating are achieved simultaneous improvement.

关 键 词：铝合金 微弧氧化 黑色膜 热控性能 耐蚀性 

分 类 号：TG174[金属学及工艺—金属表面处理]