Microstructure of trivalent chromium conversion coating on electrogalvanized steel plate
Journal
Electrochemical and Solid-State Letters
Journal Volume
11
Journal Issue
8
Date Issued
2008
Author(s)
Abstract
The microstructure of trivalent chromium conversion coating on electrogalvanized steel plate has been characterized. The as-deposited coating consisted of three layers with a thin inner layer, a porous intermediate layer, and a thin outer layer. Baking at 90°C for 30 min reduced the population density and size of cracks in the coating. Meanwhile, the outer layer became denser, but the immediate layer became highly porous. During baking at elevated temperatures, the chemical species and voids within the coating redistribute, which, in turn, suppresses the formation of microcracks that are commonly seen in the hexavalent chromium counterpart. © 2008 The Electrochemical Society.
Type
journal article