Fe-based electroplated steel sheet, chemical-conversion-treated steel sheet, electrodeposition-coated steel sheet, and automotive part

An Fe-based electroplated steel sheet comprising:

• a cold-rolled steel sheet having a chemical composition containing Si in an amount of 0.1 mass % or more and 3.0 mass % or less;
• and
• an Fe-based electroplating layer formed on one or both surfaces of the cold-rolled steel sheet with a coating weight per surface of 1.0 g/m2 or more, wherein
• in an emission intensity profile at a wavelength indicating Si measured in a depth direction from a surface of the Fe-based electroplating layer by glow discharge optical emission spectrometry, (i) there exists a peak with an emission intensity higher than an average Si intensity (ISi) in a depth range of 10.0±0.1 μm from an interface between the Fe-based electroplating layer and the cold-rolled steel sheet, (ii) a peak maximum of the peak is located deeper than 0.10 μm below the surface of the Fe-based electroplating layer, and (iii) a depth at which the emission intensity first becomes equal to the average Si intensity (ISi) after gradually decreasing in the depth direction from the peak maximum of the peak is within 2.00 μm from 0.10 μm below the surface of the Fe-based electroplating layer, and
• an average value of C concentration in a range of 10 μm to 20 μm in a thickness direction from the surface of the Fe-based electroplating layer is 0.10 mass % or less.