铝车轮低压铸造模具腐蚀起因分析  

Study on Corrosion Cause of the Aluminum Wheel Mold During Low Pressure Die-casting Process

作　　者：陈振明 林嘉华 付加攀 陈庆勋 赵海东[2] CHEN Zhenming;LIN Jiahua;FU Jiapan;CHEN Qingxun;ZHAO Haidong(Foshan Nanhai Superband Mould Co., Ltd., Foshan 528234,China;Nation Engineering Research Center for Metallic Net Shape Forming, South China University of Technology, Guangzhou 510640, China)

机构地区：[1]佛山市南海奔达模具有限公司,广东佛山528234 [2]华南理工大学国家金属材料近净成形工程技术研究中心,广东广州 510640

出　　处：《铸造技术》2019年第6期589-592,共4页Foundry Technology

基　　金：佛山市重大科技项目(应用型核心技术攻关领域)(2016AG100932)

摘　　要：利用光学显微镜和扫描电镜分析了铝车轮低压铸造模具腐蚀的形成原因。结果表明,模具型腔在表层涂料脱落后,与高温铝液直接接触而发生粘铝反应,进而形成Fe-Al-Si金属间化合物的过渡层。最终在高温铝液的反复作用下,过渡层不断扩散并从模具表面脱离,从而导致模具出现腐蚀现象。The corrosion phenomenon in the wheel mold during low pressure die casting process was investigated with optical microscope and scanning electron microscope. The results show that the surface of the mold cavity reacts with the high-temperature aluminum liquid after the falling off of the coating, which results in soldering in the mold surface. Then,the transition layer is formed and it composes of Fe-Al-Si intermetallic compound. Finally, after the cyclic action of the high-temperature aluminum liquid, the transition layer continuously diffuses and falls off from the mold surface, and it eventually causes corrosion of the mold.

关 键 词：铝合金车轮 低压铸造 模具 粘铝 腐蚀 

分 类 号：TG241[金属学及工艺—铸造]