Tinned plate with good corrosion resistance and extremely low tin content as well as passivation solution and preparation method thereof

The invention particularly relates to a tin plate with good corrosion resistance and extremely low tin content and a passivation solution and a preparation method thereof, and belongs to the technical field of tin plate passivation, the passivation solution comprises, by molar concentration, 0.08 mol/L-0. 24 mol/L of hexavalent chromium, 0.0016 mol/L-0. 063 mol/L of aluminum ions and/or zinc ions and 0.01 mol/L-1 mol/L of phosphate radicals; the pH value of the passivation solution is 1.0 to 3.5; phosphate is added into chromate, a film is formed at the iron leakage position, and the corrosion resistance of the tin plate with the extremely low tin content is improved. 本发明特别涉及一种耐蚀性好的极低锡量镀锡板及其钝化液和制备方法，属于锡板钝化技术领域，以摩尔浓度计，所述钝化液包括：六价铬0.08mol/L～0.24mol/L、铝离子和/或锌离子0.0016mol/L～0.063mol/L和磷酸根0.01mol/L～1mol/L；所述钝化液的pH值为1.0～3.5；通过在铬酸盐中加入磷酸盐，在漏铁处成膜，提高极低锡量镀锡板的耐蚀性能。