Toyo Kohan Co., Ltd.

Masashi Ichishima

Koh Yoshioka

Yoshikazu Kondo

Shinichirou Horie

Katsumi Kanda

Etsuro Tsutsumi

Toshifumi Koyanagi

Junichi Fujimoto

Hiroki Yanaga

Takao Nishimura

Takashi Tanaka

A roughened plated sheet including a roughened plated layer having a roughened nickel plated layer and a zinc plated layer formed on at least one surface of a metal substrate in this order from the metal substrate side, wherein a ten-point average roughness Rzof a surface of the roughened plated layer, according to laser microscope measurement, is 3 μm or more, and the metal substrate is a steel sheet.

Roughened plated sheet

Provided is a roughened plated sheet comprising a roughened plated layer having a roughened nickel plated layer and a zinc plated layer formed on at least one surface of a metal substrate in this order from the metal substrate side, wherein a ten-point average roughness Rzof a surface of the roughened plated layer, according to laser microscope measurement, is 3 &#x3bc;m or more.

Electroplated steel sheet suitable for soldering is provided herein by coating the plated steel sheet with a post-treatment solution in the range of 0.02 to 2 .mu.m in dry thickness. The post-treatment solution contains from 2 to 100 g/l of at least one water-soluble or water-dispersed material. The post-treatment solution may further contain chromium ion, hereafter referred to as Cr.sup.6+, from 0.01 to 3 g/l, and/or organic amine soap from 10 to 100 g/l. A suitable pH value of the post-treatment solution is from 3 to 10.

Method for post-treatment of plated steel sheet for soldering

Electroplated steel sheet suitable for soldering is provided by coating the plated steel sheet with a post-treatment solution in the range of 0.01 to 2 um in dry thickness. The post-treatment solution contains from 2 to 200 g/liter of at least one water-soluble or water-dispersed materials other than phosphoric esters, and/or from 5 to 200 g/liter of phosphoric esters, and also contains from 2 to 100 g/liter of at least one water-soluble or water-dispersable organic fluoro compound. The post-treatment solution may further contain from 0.01 to 3 g/liter of Cr.sup.6+ ion, and/or from 10 to 100 g/liter of organic amine soap. A suitable pH value of the post-treatment solution is between 3 and 10.

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Yamaguchi, Japan

Masashi Ichishima