Stock material or miscellaneous articles – All metal or with adjacent metals – Having composition – density – or hardness gradient
Patent
1984-04-27
1985-09-24
Rutledge, L. Dewayne
Stock material or miscellaneous articles
All metal or with adjacent metals
Having composition, density, or hardness gradient
428659, 428684, C23C 102
Patent
active
045433003
ABSTRACT:
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/m.sup.2 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 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/m.sup.2 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 lowermost 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.
REFERENCES:
Toda, H. et al., "Development of Two-Layered Zn-Fe Alloy Electroplated Steel Sheet-New Coated Steel Sheet for Automotive Body", SAE 840212 (1984).
Ito, K. et al., "Properties of Zn-Fe Alloy Electroplated Steel Sheets", SAE 840214 (1984).
Adaniya Takeshi
Hara Tomihiro
Nabatame Masaru
Sagiyama Masaru
Shimoma Takashi
Nippon Kokan Kabushiki Kaisha
Rutledge L. Dewayne
Yee Deborah
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