Abstract
The corrosion resistance of stainless steel in H 2SO 4 can be increased by the presence of electrodeposited Pt on the metal surface. Such an effect is only partly attributable to a greater efficiency of platinum as a cathode for O 2 reduction, which is the sole mechanism in the anodic protection of stainless steel by galvanic coupling with Pt. The greater resistance of platinized stainless steel to corrosion is due to selective deposition of platinum in form of small round particles (~ 0·01 μ dia.), under appropriate conditions of platinizing; these particles can block the most active sites of the stainless steel surface. Electron-microscope observations on thin film samples provided evidence for a certain selectivity of the Pt electrodeposition toward emerging dislocations and grain boundaries. This selectivity is linked with the degree of stability of the passivity state and can be improved by a preliminary passivating treatment.
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