中南大学学报（自然科学版）2018，Vol.49Issue(2)：316-322,7.DOI:10.11817/j.issn.1672-7207.2018.02.008
AlTiN,AlTiN-Cu和AlTiN/AlTiN-Cu涂层的组织结构与耐腐蚀性能
Microstructure and corrosion resistance of AlTiN, AlTiN-Cu and AlTiN/AlTiN-Cu coatings
摘要
Abstract
AlTiN, AlTiN-Cu and AlTiN/ AlTiN-Cu coatings were produced by cathode arc evaporation deposition equipment on WC-6％ Co substrates. Surface and cross-sectional morphologies of coatings were observed by SEM. Phase structures of coatings were studied by XRD. The corrosion resistances of coatings were investigated using Tafel polarization curve and electrochemical impedance spectroscopy in 3.5％ NaCl solution. The results show that the amount of droplets on AlTiN coating surface increases with the increase of addition of Cu, but the grain size of it is refined, and the structure is more compacted, and the porosity decreases. Compared with cemented carbide substrate, the corrosion current densities (icor) of AlTiN, AlTiN-Cu and AlTiN/AlTiN-Cu coated cemented carbides reduce by 40％,80％ and 93％, respectively, and the charge transfer resistances(Rct) of AlTiN, AlTiN-Cu and AlTiN/AlTiN-Cu coated cemented carbides increase by 2.91,3.72 and 7.85 times, respectively. Obviously, corrosion resistances of coated cemented carbides are greatly improved. The corrosion resistant abilities of three kinds of coatings decreases from large to small in following order: AlTiN/AlTiN-Cu, AlTiN-Cu and AlTN.关键词
涂层硬质合金/AlTiN-Cu/AlTiN/AlTiN-Cu/Tafel极化曲线/电化学阻抗谱/孔隙率Key words
coated cemented carbide/AlTiN-Cu/AlTiN/AlTiN-Cu/Tafel polarization curve/electrochemical impedance spectroscopy/porosity分类
矿业与冶金引用本文复制引用
陈浩,陈康华,徐银超,王云志,祝昌军,潘晨曦..AlTiN,AlTiN-Cu和AlTiN/AlTiN-Cu涂层的组织结构与耐腐蚀性能[J].中南大学学报（自然科学版）,2018,49(2):316-322,7.基金项目
国家科技重大专项(2014ZX04012011) （2014ZX04012011）
国家自然科学基金重大科研仪器设备研制专项(51327902)(Project (2014ZX04012011) supported by the Major National Science and Technology （51327902）
Project(51327902) supported by the Major Research Equipment Development of National Natural Science Foundation of China) （51327902）
