Trivalent chromium pre-treatment for corrosion protection of aluminum alloys -- an electrochemical evaluation

Book · Sat Dec 31 00:00:00 EST 1994

OSTI ID:83097

Agarwala, V S; Beckert, D W; Fabiszewski, A S; Pearlstein, F ^[1]

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1. Naval Air Warfare Center, Warminster, PA (United States). Aircraft Division

A corrosion resistant chemical conversion coating on aluminum alloys was developed using a trivalent chromium bath. Electrochemical impedance spectroscopy and dc-polarization measurements were made to determine the nature of the surface films formed. The results showed a 10 to 100 fold increase in the polarization resistance of the surface films compared to the untreated aluminum alloy. These electrochemical results compared well with the corrosion behavior in salt spray tests. The trivalent chromium-treated surfaces showed no corrosion for up to 200 hours in 5% salt spray. A post-treatment with an oxidizer even further improved its resistance which almost doubled its corrosion protection.

• OSTI ID: 83097
• Report Number(s): CONF-940222-; TRN: IM9533%%519
• Resource Relation: Conference: Corrosion 94: National Association of Corrosion Engineers (NACE) international annual conference, Baltimore, MD (United States), 28 Feb - 4 Mar 1994; Other Information: PBD: 1994; Related Information: Is Part Of Corrosion/94 conference papers; PB: 5005 p.
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CORROSION PROTECTION
CHROMIUM
CHEMICAL COATING
ELECTROCHEMICAL CORROSION
SEAWATER
CORROSIVE EFFECTS
SAMPLE PREPARATION
EXPERIMENTAL DATA