Corrosion of Painted Materials

The most common example is automotive corrosion consisting of (i) cosmetic corrosion and (ii) perforation corrosion. The features of the two modes of corrosion are [Pg.287]

Cosmetic corrosion Surface attack at spots where paint is damaged related to (i) red rust, (ii) paint creep, (iii) chipping factors involved are (i) coating composition and thickness, (ii) surface treatment, (iii) type of paint damage, (iv) type of paint generally evaluated by (i) measuring length of underpaint creep, (ii) extent of rust formation or paint loss [Pg.287]

13 Hanford very fine sandy loam, Bakersfield, CA 290 9.5 3.7 [Pg.288]

Perforation Initiates at the interior and spreads to cause perforation corrosion [Pg.288]

The possible delamination modes are (i) loss of adhesion at paint/phosphate interface, (ii) within phosphate layer due to mechanical fracture (iii) due to dissolution of phosphate (iv) dissolution of coating (v) mechanical failure at coating/steel interface. [Pg.288]

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