公开(公告)号：US20010001965A1

公开(公告)日：2001-05-31

申请号：US09029574

申请日：1998-03-23

Applicant: Tatsuya Miyoshi

Inventor： TATSUY MIYOSHI ,  TAKAHIRO KUBOTA ,  MASARU SAGIYAMA ,  YOSHIHARU SUGIMOTO ,  MASAAKI YAMASHITA

IPC: C23C022/24

CPC classification number: C23C22/30 ,  C23C2/26

Abstract: In order to manufacture a chromate-coated lead-containing galvanized steel sheet having beautiful spangles and excellent anti-black patina and anti-white rust properties without relying upon any flushing treatment with Ni, etc., a lead-containing galvanized steel sheet obtained by plating in a galvanizing bath containing appropriate amounts of Pb and Al, and having beautiful spangles is coated with a chromate coating solution containing trivalent and hexavalent chromium ions in a molar ratio of 1/9 to 1/1, and nitrate ions in a molar ratio of 0.1 to 1.6 to the total of the chromium ions, preferably after treatment with an aqueous alkali solution having a pH of 9 or above, and washing with water, and the sheet is dried at an appropriate sheet temperature without being washed with water, whereby a chromate film having a coating weight of 5 to 50 mg/m2 is formed thereon. The lead and aluminum with which the galvanized surface is enriched are, as a result, removed effectively, thereby enabling excellent anti-black patina and anti-white rust properties to be obtained.

Abstract translation: 为了制造具有美丽的花边和优异的抗黑色斑点和防白锈锈的铬酸盐涂覆的含铅镀锌钢板，而不依赖于用镍等进行的任何冲洗处理，将含铅镀锌钢板 在含有适当量的Pb和Al并且具有美丽的矩形的镀锌浴中镀覆含有摩尔比为1/9至1/1的三价和六价铬离子的铬酸盐涂层溶液，摩尔比为 相对于铬离子总量为0.1〜1.6，优选用pH为9以上的碱性水溶液处理后，用水洗涤，将该片在适当的片材温度下干燥而不用水洗涤，由此 在其上形成涂层重量为5〜50mg / m 2的铬酸盐膜。 结果，镀锌表面富集的铅和铝被有效地除去，从而获得优异的抗黑色铜绿和抗白锈锈性能。