铝合金表面活性燃烧高速燃气喷涂WC涂层的耐中性盐雾腐蚀性能
Corrosion Resistance of WC Coatings Sprayed by AC-HVAF on Aluminum Alloy in Neutral Salt Spray
摘 要
利用活性燃烧高速燃气(AC-HVAF)喷涂技术在7075高强铝合金基体上制备了WC-10Co4Cr和WC-14Co涂层,并利用SEM、EDS、XRD、电化学测试以及中性盐雾(NaCl)腐蚀试验等方法分析了涂层的物相、微观组织、耐腐蚀性能和腐蚀产物形貌.结果表明:所制备的WC涂层均未出现明显的脱碳现象,都很致密,孔隙率低于1%且与基体结合较好;WC涂层的腐蚀电位明显高于7075铝合金基体的,而涂层中加入铬元素后进一步提高了涂层的腐蚀电位;WC-10Co4Cr涂层在600 h中性盐雾试验中的耐腐蚀性能好于WC-14Co涂层的.
WC涂层
电化学
中性盐雾试验
AC-HVAF
WC coating
electrochemistry
neutral salt spray testing
Abstract
WC-10Co4Cr and WC-14Co coatings were prepared using activated combustion high velocity air fuel (AC-HVAF) spraying technology on 7075 high strength aluminum alloy substrate.The microstructure,corrosion resistance and corrosion morphology were investigated by means of SEM,EDS,XRD,electrochemical testing and neutral salt spray testing.The results show that WC coatings presented no obvious decarburization.The coatings were dense and the porosity was below 1%.The binding with the substrate was fairly good.The corrosion potential of the 7075 Al alloy substrate metal was increased obviously by the coating and increased further when Cr was added in the bonded phase.WC-10Co4Cr coating exhibited better corrosion resistance than WC-14Co coating in neutral salt spray for 600 h.
中图分类号 TG174
所属栏目 新材料 新工艺
基金项目
收稿日期 2008/3/4
修改稿日期 2008/10/20
网络出版日期
作者单位点击查看
备注任建平(1979-),男,江西新余人,硕士研究生.
引用该论文: REN Jian-ping,LIU Min,DENG Chun-ming,SONG Jin-bing. Corrosion Resistance of WC Coatings Sprayed by AC-HVAF on Aluminum Alloy in Neutral Salt Spray[J]. Materials for mechancial engineering, 2009, 33(3): 39～42
任建平,刘敏,邓春明,宋进兵. 铝合金表面活性燃烧高速燃气喷涂WC涂层的耐中性盐雾腐蚀性能[J]. 机械工程材料, 2009, 33(3): 39～42
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参考文献
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【2】LUKASAK D A,HART R M.Strong aluminum alloys haves airframe weight[J].Advanced Materials & Processes,1991(10):46.
【3】路伟.提高发动机铝合金件耐磨性的表面处理工艺[J].电镀与装饰,2007,29(3):25-41.
【4】马光,王国刚,孙冬,等.两种AC-HVAF喷涂WC涂层微观组织以及耐蚀性研究[J].材料工程,2007(8):73-78.
【5】樊自拴,孙冬柏,俞宏英,等.超音速火焰喷涂技术研究进展[J].材料保护,2004,37(9):33-35.
【6】邓春明.300M低合金钢基HVAF WC涂层的研究[D].广州:广东工业大学,2006:44-45.
【7】MONTICELLI C,FRIGNANI A,ZUCCHI F.Investigation on the corrosion process of carbon steel coated by HVAFWC/Co cermets in neutral solution[J].Corrosion Science,2004,46:1225-1237.
【8】SOUZA V A D,NEVILLE A.Linking electrochemical corrosion behavior and corrosion mechanisms of thermal spray cermet coatings(WC-CrNi and WC／CrC-CoCr)[J].Materials Science and Engineering A,2003,352:202-211.
【9】邓春明,周克崧,刘敏,等.Cr对超音速火焰喷涂WC-Co涂层抗中性盐雾腐蚀性能的影响[J].材料开发与应用,2007,22(3):33-36.
【10】邓春明,周克崧,刘敏,等.超音速火焰喷涂及封孔处理对低合金钢抗中性盐雾腐蚀性能的影响[J].材料保护,2006,39(10):33-35.
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