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In general, the results indicate that the perforation corrosion resistance of coated products is much greater than that of cold rolled steel, and that it also increases with coating mass, as well as with application of a barrier organic coating. Magnetite (Fe3O4) was the predominant iron corrosion product found in the crevices of the perforation corrosion test specimens.

A new, standard laboratory test (SAE J 2334) for evaluation of the cosmetic corrosion resistance of autobody steel sheet has been developed through the joint efforts of SAE's Automotive Corrosion Prevention Committee (SAE/ACAP) and the Auto/Steel Partnership's (A/SP) Corrosion Task Force. Results from this test give an excellent correlation with those of on-vehicle tests conducted in Montreal, Quebec, and St. John's, Newfoundland. To establish the precision of the new test, nine laboratories participated in a round-robin evaluation. Each laboratory tested ten standard, painted automotive steel sheet products. The results of this work are analyzed in terms of within-lab repeatability and lab-to-lab reproducibility, and they are an important and final milestone in the development and specification of the new test