B - Operations – Transporting – 23 – K
Patent
B - Operations, Transporting
23
K
204/25
B23K 3/00 (2006.01) C25D 3/56 (2006.01) C25D 5/10 (2006.01)
Patent
CA 1217303
IRON-ZINC ALLOY ELECTRO-GALVANIZED STEEL SHEET HAVING A PLURALITY OF IRON-ZINC ALLOY COATINGS ABSTRACT OF THE DISCLOSURE An iron-zinc alloy electro-galvanized steel sheet having a plurality of iron-zinc alloy coatings, which comprises: at least one iron-zinc alloy coating as the lower layer, formed on the surface of a steel sheet, and at least two iron-zinc alloy coatings as the upper layer, formed on the at least one iron-zinc alloy coating as the lower layer. The ratio of iron content to the coating weight of each of the at least one iron-zinc alloy coating as the lower layer is within the range of from 1 to 15 wt.%, and the total coating weight of the at least one iron-zinc alloy coating as the lower layer is within the range of from 1 to 50 g/m2 per side of the steel sheet. The ratio of iron content to the coating weight of each of the at least two iron-zinc alloy coatings as the upper layer is over 15 wt.%, the ratio of iron content to the coating weight gradually increases from the innermost coating toward the outermost coating of the at least two iron-zinc alloy coatings as the upper layer, the difference in the ratio or iron content to the coating weight between two adjacent coatings of the at least two iron-zinc alloy - 1 - coatings as the upper layer is within the range of from 1 to 15 wt.%, and the total coating weight of the at least two iron-zinc alloy coatings as the upper layer is within the range of from 1 to 40 g/m2 per side of the steel sheet. The difference in the ratio of iron content to the coating weight between the uppermost coating of the at least one iron-zinc alloy coating as the lower layer and the lower- most coating of the at least two iron-zinc alloy coatings as the upper layer is within the range of from 1 to 15 wt.%. The sum of the total coating weight of the at least one iron-zinc alloy coating as the lower layer and the total coating weight of the at least two iron-zinc alloy coatings as the upper layer is within the range of from 10 to 75 wt.% per side of the steel sheet. - 2 -
453331
Adaniya Takeshi
Hara Tomihiro
Nabatame Masaru
Sagiyama Masaru
Shimoma Takashi
Macrae & Co.
Nippon Kokan Kabushiki Kaisha
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