Patent ID: 8420224
Filing Date: 2013-04-16
Classification: C23C,C25D,Y10T

Abstract:
1. A rust preventive coated zinc or zinc alloy plated steel sheet superior in surface conductivity, comprising: a zinc or zinc alloy plated steel sheet coated with a thin-film primary rust preventive coating layer; the thin-film primary rust preventive coating layer having an average thickness of 0.2 μm to 5.0 μm, the zinc or zinc alloy plated steel sheet having an arithmetic average roughness of a zinc plated layer surface, Ra, of 0.3 μm to 2.0 μm, as defined by JIS B 0601, obtained using a stylus-type surface roughness meter, as defined by JIS B 0651, and a maximum peak height, Rp, of 4.0 μm to 20.0 μm, wherein the arithmetic average roughness of a zinc plated layer surface, Ra (peak), obtained by measuring a range of evaluation length of 20 μm of peak parts of 80% or more of the Rp by an electron beam 3D roughness analyzer is 70% or more of the arithmetic average roughness, Ra (average), obtained by measuring a range of evaluation length of 20 μm of parts of a height of ±20% about an average line, obtained by a stylus-type surface roughness meter, by an electron beam 3D roughness analyzer.