Premium
Corrosion inhibition of pure aluminium and AA2014‐T6 alloy by strontium chromate at low concentration
Author(s) -
Liu Yanwen,
Feng Zuwei,
Zhou Xiaorong,
Thompson George E.,
Skeldon Peter,
Lyon Stuart B.,
Gibbon Simon R.,
Graham Derek
Publication year - 2016
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.5845
Subject(s) - chromate conversion coating , corrosion , cathodic protection , aluminium , alloy , metallurgy , materials science , aluminium alloy , leaching (pedology) , strontium , chromium , anode , chemistry , electrode , organic chemistry , environmental science , soil science , soil water
The influence of a low concentration of strontium chromate on the corrosion inhibition of superpure aluminium and AA2014‐T6 aluminium alloy in 0.6 m chloride solution has been investigated to simulate the leaching process of inhibitors from coatings. The potential‐time and polarisation behaviour show influences on both the anodic and cathodic kinetics on the superpure aluminium surface. However, predominant cathodic inhibition was observed for the AA2014‐T6 aluminium alloy. It was evident that chromium species were reduced at cathodic second phase particles, forming a thin passive film at the cathodic sites, which blocks the oxygen reduction reaction and, consequently, provides effective corrosion inhibition. Copyright © 2015 The Authors Surface and Interface Analysis Published by John Wiley & Sons Ltd.