Corrosion performance of plasma-sprayed cast iron coatings on aluminum alloy for automotive components

Kim W., Ahn S., Kim H., Kim J., Ozdemir I., Tsunekawa Y.

SURFACE & COATINGS TECHNOLOGY, vol.200, pp.1162-1167, 2005 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 200
  • Publication Date: 2005
  • Doi Number: 10.1016/j.surfcoat.2005.02.220
  • Journal Name: SURFACE & COATINGS TECHNOLOGY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1162-1167
  • Keywords: EIS, equivalent circuit, plasma spray, cast iron coating, corrosion, porosity
  • Dokuz Eylül University Affiliated: No

Abstract

Corrosion behaviour of coatings sprayed with water-atomized (WA), cast iron powder were investigated by surface analyses and electrochemical methods, such as potentiodynamic polarization test and electrochemical impedance spectroscopy (EIS) in deaerated 0.5 M H2SO4 solution. WA cast iron powders of Fe-3.75C-3.60Si-3.93Al (wt.%) were deposited onto an aluminum alloy (AA383 alloy) substrate by atmospheric DC plasma spraying. Four types of samples were prepared including cast iron liner and aluminum alloy substrate. C-1 coating was produced by using as-received WA cast iron powders without graphite and C-2 coating by using pre-annealing cast iron powder containing graphite structure. The results of the electrochemical tests indicated that the C-2 coating had greater corrosion-resistant properties than the C-1 coating, which could be attributed to its lower porosity, higher protective efficiency, and increased packing factor. (c) 2005 Elsevier B.V All rights reserved.