Measurement of underfilm corrosion propagation by use of spotface paint damage

Book · Wed Nov 01 04:00:00 EST 1995

OSTI ID:124428

Jordan, D L; Franks, L L ^[1]; Kallend, J S ^[2]

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1. Inland Steel Flat Products Co., East Chicago, IN (United States)
2. Illinois Inst. of Technology, Chicago, IL (United States). IIT Center

A new method of paint damage for underfilm corrosion testing of painted galvanized steel was introduced. The method was based on the observation that the onset of underfilm creepback propagation in atmospheric exposures is preceded by the formation of red rust at the paint defect. Spotface panel damage, i.e., milling through organic and metallic coatings to create a large, unprotected source of red rust, was used to shorten the time needed to produce underfilm creepback in atmospheric exposures. The traditional scribe method of paint damage was used in the same tests. Statistical techniques were used to rank underfilm creepback performance on a variety of painted metallic coated steels and to provide rank correlations between scribe and spotface data. Spotface data collected at six months provided similar rankings and discriminating ability as scribe data collected after a 30 month atmospheric exposure.

• OSTI ID: 124428
• Report Number(s): CONF-950304--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COATINGS
CORRELATIONS
CORROSION
CORROSION PRODUCTS
DAMAGE
DEFECTS
ELECTROCHEMICAL CORROSION
EXPERIMENTAL DATA
MATERIALS TESTING
PAINTS
PHOSPHATES
SODIUM CHLORIDES
STEELS
TIME DEPENDENCE
ZINC