Vanadate post-treatments of anodised aluminium and AA 2024 T3 alloy for corrosion protection. (4th May 2018)

• Record Type: Journal Article
• Authors: Liu, S.; Thompson, G. E.; Skeldon, P.
• Is Part Of: Transactions of the Institute of Metal Finishing. Volume 96:Number 3(2018)
• Page Start: 137
• Page End: 144
• Publication Date: 2018-05-04
• Subjects: Aluminium -- alloy -- anodising -- anodic films -- inhibitor; Metals -- Finishing -- Periodicals; Metals -- Surfaces -- Periodicals; Metallurgy -- Periodicals; 671.705
• DOI: 10.1080/00202967.2018.1419629
• Languages: English
• ISSNs: 0020-2967

Abstract

ABSTRACT: Porous anodic films formed on aluminium in sulphuric acid were post-treated using various double-dip processes that incorporate a sparingly-soluble, vanadate, corrosion inhibitor. The processes were optimised by investigating the effects of the double-dip order, the rinsing step, the immersion time and the double-dip method. The optimised processes were applied to AA 2024-T3 alloy, which was then exposed to salt spray. V-Ce(III) and V-Zn processes provided corrosion protection similar to that of sealed, sulphuric acid-formed films. A V-Ni process provided increased protection, similar to that of hot water sealed films formed in chromic acid.