Galvanic corrosion study of aluminium alloy plates mounted to stainless and mild steel bolts by accelerated exposure test

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MREMA, Emmanuel ; ITOH, Yoshito ; KANEKO, Akira ; HIROHATA, Mikihito (2016)
  • Publisher: 土木学会
  • Journal: 構造工学論文集A, volume 62, pages 525-536 (issn: 1881-6614)
  • Subject: aluminium alloy | salt water spray test | galvanic corrosion | surface treatment

Despite the fact that aluminium alloy members have a proven durability over stainless steel members, their joint fasteners like bolts, nuts and washers are drawn from steel material due to aluminium alloy inferior mechanical properties. Bare contact between aluminium alloy members and stainless steel fasteners results to galvanic corrosion of aluminium alloy members. A corrosion behaviour study was carried out on different aluminium alloy types with different surface treatments mounted to stainless and mild steel fasteners with different surface treatments and subjected to a 1000 hours salt water spray test. It was found that fasteners treated with zinc flake coating exhibited strongest resistance against galvanic corrosion. Among untreated specimens, aluminium alloy type A5083P-O was found to be the most durable.
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