METHOD FOR DETERMINING QUANTITY OF ALLOY PHASE IN PLATING LAYER AND METHOD FOR EVALUATING SLIDING PROPERTY OF ALLOYED HOT-DIP GALVANIZEDSTEEL SHEET

摘要

A method for determining alloy phases in a plating layer of a plated metalli c material having plural types of alloy phases which comprises carrying out a controlled potential electrolysis of the alloy phases using the plated metallic material as an anode at each of plural potentials set based on immersion potentials of the base metal and the alloy phases, and determining each of the alloy phases in the plating layer based on the quantity of electricity passed at the above each of plural potentials; and a method for evaluating the sliding property of an alloy galvanized steel plate which comprises carrying out a controlled potential electrolysis using the alloy galvanized steel plate as an anode in an aqueous zinc sulfate-sodium chlorid e solution in the potential range of 940 to 920 mV vs SCE, and evaluating a steel plate exhibiting a quantity of electricity passed in the controlled potential electrolysis less than a predetermined value as an alloy galvanize d steel plate having good sliding property.