氧化时间对LAZ933镁锂合金微弧氧化热控涂层的结构与性能的影响  

Effect of Oxidation Time on the Structure and Properties of LAZ933 Magnesium-Lithium Alloy Micro-Arc Oxidation Thermal Control Coating

作　　者：张文涛 辛世刚[2] 李伟[1] 黄卿 ZHANG Wentao;XIN Shigang;LI Wei;HUANG Qing(School of Materials and Chemistry,University of Shanghai for Science and Technology,Shanghai 200093,China;Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 201899,China)

机构地区：[1]上海理工大学材料与化学学院,上海200093 [2]中国科学院上海硅酸盐研究所,上海201899

出　　处：《材料保护》2024年第5期165-171,共7页Materials Protection

摘　　要：利用微弧氧化技术在LAZ933镁锂合金表面制备热控涂层,研究氧化时间对涂层热控性能及耐腐蚀性能的影响,采用扫描电镜、X射线衍射仪、表面轮廓仪、测厚仪等仪器分析氧化时间对涂层的表面形貌、组成、厚度、粗糙度的影响。结果表明:随氧化时间逐渐延长,涂层表面的孔洞数量逐渐减少,孔径逐渐增加并出现微裂纹,且涂层的厚度及粗糙度逐渐增加,半球发射率逐渐上升,太阳吸收比逐渐降低,耐腐蚀性能得到提升,在氧化60 min时,涂层的半球发射率为0.85,太阳吸收比为0.38,自腐蚀电流密度相比于LAZ933镁锂合金降低了1个数量级。The thermal control coating was prepared on the surface of LAZ933 magnesium-lithium alloy by micro-arc oxidation technology.The effects of oxidation time on the surface morphology,composition,thickness,roughness,thermal control and corrosion resistance of the coating were analyzed by scanning electron microscopy,X-ray diffractometer,surface profilometer,thickness gauge and other instruments.Results showed that as the oxidation time gradually prolonged,the number of pores on the coating surface gradually decreased,the pore size gradually rose with the emergence of microcracks,and the thickness and roughness of the coating gradually were raised.Meanwhile,the hemispherical emissivity gradually increased,the solar absorption ratio declined,and the corrosion resistance was improved.When the oxidation time was 60 min,the as-obtained coating possessed the hemispherical emissivity of 0.85 and the solar absorption rate of 0.38,and the self-corrosion current density was an order of magnitude lower than that of LAZ933 magnesium-lithium alloy.

关 键 词：镁锂合金 微弧氧化 热控涂层 耐腐蚀性能 

分 类 号：TG174.45[金属学及工艺—金属表面处理]