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Impedance measurements were performed at room temperature in a 0.005 M Na2HPO4 solution on steel and on electrodeposited Zn and Zn–12%Ni before and after phosphating. It was found that potential and impedance parameters (Rct and Cd) for phosphated materials attained nearly steady values within about 20 min, indicating that this solution did not cause meaningful changes in phosphate coatings and...
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