Ti/CrN、Ti/TiN/CrN镀层对8418热作模具钢耐铝合金熔体腐蚀性能的影响
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。
镀层
多弧离子镀
铝合金
铝熔体腐蚀
die casting mould steel
coating
multi-arc ion plating
aluminum alloy
Al melt corrosion
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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