Morphology and Mechanism of Benign Inhibitors
Abstract
This project demonstrates that most interfacial issues important to corrosion control can be elucidated by neutron and x-ray reflectivity. The evolution of a surface in a corrosive environment can now be measured in near real time. The data produced give corrosion scientists their first glimpse at active corrosion processes in water under potential control. The methodology was applied to Al protected by Trivalent Chromium Process (TCP) conversion coatings, vanadate conversion coatings and anodized aluminum. In all three cases, water penetrates the protective films. Corrosion protection is due to a thin interfacial layer as water penetrates all films studied. Failure on passive metals can be accelerated by application of an anodic potential. Failure of TCP-coated Al occurs by bulk water penetration of the film at the pitting potential. The compromised film remains on the metal creating an isolated environment conducive to pitting. A new anodic hardening method was developed by exposing TCP-coated Alto increasingly anodic potentials in the presence of a cerium chloride solution.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 2012
- Accession Number
- ADA581696
Entities
People
- Dale W Schaefer
- Naiping Hu
- Peng Wang
- Xuecheng Dong
Organizations
- University of Cincinnati