微量 Ni 被覆を施した薄錫めつき鋼板の Fe-Sn 合金形成挙動

概要

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The behavior of Fe-Sn alloy formation on low tin-plated surface of Ni flash-coated steel substrate was studied at stoving temperature for lacquer coating. The results are as follows : 1) Making Ni flash coating amount as 15mg/m^2 on steel substrate and limiting the amount of alloyed Sn to 400mg/m^2 and less through the reflowing process for tin-plated surface eliminate the unfavorable influence of cathodic passivation on the increase of Fe-Sn alloy during stoving and assure the minimum formation of unfavorable Fe-Sn alloy to weldability after lacquer coating. 2) The developed low tin plated steel sheet product from an electrolytic tinning line has a "dewy" appearance of melted tin. 3) Flash-coated Ni on steel substrate decreases the rate costant for Fe-Sn alloy growth during stoving of the developed product. The Fe-Sn alloy on the developed product after stoving is determined as a phase of very compact FeSn_2, but contains the Ni flash coated on the substrate. The crystal orientation of FeSn_2 on the product after stoving shows a strong preference for (002) plane. 4) The accelerating effect of Cr passivation film on Fe-Sn alloy formation during stoving is derived from Cr^<EC> in the passivation film. The increment of Cr^<EC> amount in Cr passivation film correlates linearly to the increment of Fe-Sn alloy amount during stoving.
社団法人日本鉄鋼協会の論文
1986-07-01