標題: Effect of phosphate surface pretreatment on corrosion resistance and adhesion of PI coating on Mg-5 wt.% Sn alloy
作者: Lee, Hsiao-Chien
Huang, Yi-Chia
Liu, Tzeng-Feng
Whang, Wha-Tzong
Chao, Chuen-Guang
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: corrosion;chrome-free conversion coating;XPS;polyimide;magnesium-tin alloy
公開日期: 18-Jun-2015
摘要: In this study, phosphate surface pretreatment (PSPT) and poly[pyromellitic dianhydride-co-4,4MODIFIER LETTER PRIME-oxydianiline] polyimide (PMDA-ODA PI) coating were used to provide corrosion protection for Mg-5 wt.% Sn alloy. PSPT enhanced the adhesion of PI coating by mechanical interlocking and chemical anchoring. Surface roughness was increased and provided stronger mechanical interlocking. Phosphates were formed on the alloy surface to act as anchor groups. Energy dispersive X-rayspectrometer and X-ray photoelectron spectroscopy results indicated that bonds formed between anchor groups and PI coating. The bonds provided chemical anchoring and enhanced the adhesion of PI coating. The increase of corrosion resistance of PI coating on Mg-5 wt.% Sn alloy (E-corr = -0.86V/SCE, [GRAPHICS] mu A cm(-2) and corrosion rate far less than [GRAPHICS] showed the bonds were stable enough to stand the attack of electrolyte and inhibit the electrochemical reaction at the interface.
URI: http://dx.doi.org/10.1080/01694243.2015.1022497
http://hdl.handle.net/11536/124432
ISSN: 0169-4243
DOI: 10.1080/01694243.2015.1022497
期刊: JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY
Volume: 29
Issue: 12
起始頁: 1229
結束頁: 1245
Appears in Collections:Articles