| 摘要 |
PURPOSE:To develop a steel plate which has excellent corrosion preventiveness and electrodeposition paintability and has the characteristic to permit resistance welding by plating a metal electrochemically baser than Fe on the surface of the steel plate then forming an amorphous film of the oxide of a specific metal thereon. CONSTITUTION:Zn, Zn-Fe alloy, Zn-Ni alloy or the like electrochemically baser than Fe is plated on the surface of a steel plate. A soln. prepd. by dissolving the alkoxide of 1 or >=2 kinds of metals among Si, Al, Ti, Zn, Ta, etc. in alcohol and ester such as ethyl acetate, butyl acetate or the like is coated on the plated surface. The steel plate is then heated to 100-600 deg.C in an atmosphere of air, Ar, N2, etc. to form the dense amorphous film of the oxide of said metal. The steel plate which has excellent corrosion preventiveness of the steel used as the substrate, has good electrodeposition paintability and permits resistance welding is thus obtd.
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