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据《Сталъ》1988,No11报道:镀锡板的使用性能(涂漆性、焊接性)取决于它的表面状态,最主要的是钝化膜和油膜。在电镀锡机组中镀锡板表面钝化的标准工艺是:25—30g/l重铬酸钠,阴极电流密度4—10A/dm~2,温度45—85℃。钝化膜中的铭含量一般为0.06—0.15mg/dm~2,金属铬含量占30—50％。这种膜能防止镀锡板在运输和储存期间的腐蚀,能改善漆层的结合力及对亚硫酸盐腐蚀的耐久性,并且不会妨害焊接过程。因此,在镀锡板生产中,都仔细控制铬膜的组成和质量。
According to “Сталъ” 1988, No11 report: tin plate performance (paint, weldability) depends on its surface state, the most important is the passivation film and film. In the tin plating tin plate surface passivation of the standard process is: 25-30g / l sodium dichromate, cathode current density 4-10A / dm ~ 2, temperature 45-85 ℃. In the passivation film Ming content is generally 0.06-0.15mg / dm ~ 2, the metal chromium content of 30-50%. This film prevents tinplate corrosion during shipping and storage, improves paint adhesion and durability against sulphite corrosion without interfering with the welding process. Therefore, the composition and quality of the chromium film are carefully controlled in tinplate production.