Effect of Ti/CrN and Ti/TiN/CrN Coatings on the Corrosion Resistance of 8418 Hot-working Steel Against Al Alloy Melt
摘 要
为减少铝合金压铸模的粘铝倾向,提高模具寿命,采用多弧离子法在8418热作模具钢表面分别沉积Ti/CrN双层和Ti/TiN/CrN三层镀层。用扫描电子显微镜和X射线衍射仪分析镀层的微观结构、成分和相组成。结果表明: 沉积获得的Ti/CrN和Ti/TiN/CrN镀层的总厚度分别为2.0 μm和1.9 μm,镀层组织均匀,与基体结合紧密,无明显缺陷。700 ℃铝合金熔体腐蚀试验结果表明,沉积Ti/CrN或Ti/TiN/CrN镀层都能明显改善8418热作模具钢的抗铝液腐蚀性能,镀层间和镀层与基体间的结合紧密。
Abstract
In order to reduce the adhesion tendency of aluminum melt on die casting mould, and improve the service life of the die, multi-arc ion plating was used to deposit Ti/CrN double layers coating and Ti/TiN/CrN triple layers coating on the surface of 8418 hot-working die steel. Scanning electron microscopy and X-ray diffraction were used to study the microstructure, composition and phase constituent of the coating. The results showed that the total thickness of Ti/CrN and Ti/TiN/CrN coatings was 2.0 μm and 1.9 μm, respectively. Uniform coatings with good bonding were obtained, and obvious defects were not observed. 700 ℃ A356 aluminum alloy melt test showed that both Ti/CrN and Ti/TiN/CrN coatings could improve the corrosion resistance of the 8418 hot-working die steel significantly against the aluminum alloy melt and no dehiscence of coating layers could be observed after dipping.
中图分类号 TG174.4 DOI 10.11973/fsyfh-201605009
所属栏目 试验研究
基金项目 广东省重点实验室建设项目(2012A061400011)
收稿日期 2015/10/26
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备注易耀勇(1966-),高级工程师,博士,主要从事材料焊接性研究,
引用该论文: LUO Zhe-min,NI Dong-hui,YI Yao-yong,LI Lie-jun. Effect of Ti/CrN and Ti/TiN/CrN Coatings on the Corrosion Resistance of 8418 Hot-working Steel Against Al Alloy Melt[J]. Corrosion & Protection, 2016, 37(5): 388
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