环保型无机缓蚀剂对AZ91D镁合金的缓蚀效果  

Inhibition Effect of Environmental Protection Inorganic Corrosion Inhibitor on AZ91D Magnesium Alloy

作　　者：王丽 顾威 郭荣 付文 WANG Li;GU Wei;GUO Rong;FU Wen(College of Chemical Engineering,Guangdong University of Petrochemical Technology,Maoming 525000,China)

机构地区：[1]广东石油化工学院化学工程学院,广东茂名525000

出　　处：《电镀与精饰》2020年第4期18-22,共5页Plating & Finishing

基　　金：广东省自然科学基金(2017A030310663,2018A030307018,2018A0303070003);广东省教育厅育苗工程(702/517053);广东省非常规能源工程技术研究中心(GF2018A005)。

摘　　要：本文采用微弧氧化工艺对镁合金进行预处理,然后研究了磷酸氢二钠、四硼酸钠、四硼酸钠/磷酸氢二钠等环保缓蚀剂对微弧氧化镁合金的缓蚀效果。用电子显微镜对微弧氧化样品及添加缓蚀剂浸泡样品的腐蚀形貌进行分析,用XRD对浸泡腐蚀样品表面成分进行分析。结果表明,室温下,1.2 g/L磷酸氢二钠、四硼酸钠、四硼酸钠/磷酸氢二钠的缓释率分别达到28.07%、45.41%和74.13%,四硼酸钠/磷酸氢二钠复配缓蚀剂缓释效果优于单一缓蚀剂。添加缓蚀剂样品表面形成偏硼酸镁及磷化物层,表面裂纹减少,浸泡腐蚀与电化学腐蚀结果一致。In this paper,the magnesium alloys was pretreated by micro-arc oxidation process,and then the corrosion inhibition effects of environmental protection inhibitors of Na2HPO4,Na2B4O7 and Na2B4O7/Na2HPO4 on micro-arc oxidation magnesium alloys were studied.The corrosion morphology of micro-arc oxidation samples and corrosion inhibitor-impregnated samples were analyzed by electron microscopy,and the surface composition of corrosion samples was analyzed by XRD.The results showed that the slow release rates of 1.2 g/L Na2HPO4,Na2B4O7 and Na2B4O7/Na2HPO4 reached 28.07%,45.41%and 74.13% respectively at room temperature.The corrosion inhibition effect of Na2B4O7/Na2HPO4 composite inhibitor was better than that of single inhibitor.Magnesium metaborate and phosphide layers were formed on the surface of the samples with corrosion inhibitors,and the surface cracks were reduced.The results of im mersion corrosion were consistent with those of electrochemical corrosion.

关 键 词：镁合金 磷酸氢二钠 四硼酸钠 缓释剂 

分 类 号：TG174.45[金属学及工艺—金属表面处理]