Effect of phosphate surface pretreatment on corrosion resistance and adhesion of PI coating on Mg-5 wt.% Sn alloy

Hsiao Chien Lee, Yi Chia Huang, Tzeng-Feng Liu, Wha Tzong Whang, Chuen-Guang Chao

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

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,
Original languageEnglish
Pages (from-to)1229-1245
Number of pages17
JournalJournal of Adhesion Science and Technology
Volume29
Issue number12
DOIs
StatePublished - 18 Jun 2015

Keywords

  • AZ91D MAGNESIUM ALLOY
  • MECHANICAL-PROPERTIES
  • POLY(ETHER IMIDE)
  • GROWTH
  • BEHAVIOR
  • AZ31
  • MORPHOLOGY
  • MICROSTRUCTURE
  • Protection
  • INTERFACES

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