Corrosion behavior of zinc-nickel alloy electrodeposited coatings

Journal Article · Sun Aug 01 00:00:00 EDT 1999 · Corrosion

DOI:https://doi.org/10.5006/1.3284028· OSTI ID:684429

Fabri Miranda, F J ^[1]; Margarit, I C.P.; Mattos, O R; Barcia, O E ^[2]; Wiart, R ^[3]

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1. USIMINAS, Ipatinga, Minas Gerais (Brazil)
2. UFRJ, Rio de Janeiro (Brazil)
3. Univ. Pierre et M. Curie, Paris (France)

Various types of zinc-electrocoated steel sheets are used to improve the durability of car bodies. Among these coatings, the Zn-Ni alloy has higher corrosion resistance than pure Zn, as well as better welding and painting properties. The corrosion mechanism of the Zn-Ni alloy has been investigated mainly on the basis of accelerated tests and electrochemical measurements. There are few data about long-term corrosion tests. In the present study, the behavior of unpainted Zn-Ni alloy coated steel was studied during 3 years of exposure in industrial and marine environments. Electrochemical impedance spectroscopy (EIS) and surface analysis (scanning electron microscopy [SEM] and Auger electron spectroscopy [AES]) were the experimental techniques used. Long-term atmospheric corrosion mechanism of Zn-Ni coatings was discussed and compared with that proposed based on short-term tests.

• Sponsoring Organization: USDOE
• OSTI ID: 684429
• Journal Information: Corrosion, Vol. 55, Issue 8; Other Information: PBD: Aug 1999
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
33 ADVANCED PROPULSION SYSTEMS
CORROSION
ZINC ALLOYS
NICKEL ALLOYS
AUTOMOBILES
ELECTRODEPOSITED COATINGS
STEELS
ENVIRONMENT
SPECTROSCOPY
MICROSCOPY