COMPOSITION FOR A TRIVALENT CHROMIUM CHEMICAL TREATMENT SOLUTION, A MANUFACTURING METHOD THEREOF, AND A CHEMICAL TREATMENT METHOD OF AN ELECTRO-TINNED STEEL SHEET USING THE SAME TO PREVENT OLATION OF A TRIVALENT CHROMIUM COMPOUND

摘要

PURPOSE: A composition for a trivalent chromium chemical treatment solution, a manufacturing method thereof, and a chemical treatment method of an electro-tinned steel sheet using the same are provided to obtain excellent bake discoloration, detinning, sulphide stain resistance, surface wettability, and lacquer adhesion without using hexavalent chromium.;CONSTITUTION: A composition for a trivalent chromium chemical treatment solution comprises a trivalent chromium compound, a complexing agent 0.5-6M, and an antioxidant 0.5-3M. The trivalent chromium compound contains 0.1-4M of chromium. The complexing agent restricts olation of the trivalent chromium compound in an aqueous solution. The antioxidant restricts the oxidation of trivalent chromium compound.;COPYRIGHT KIPO 2013;[Reference numerals] (AA, LL) Division; (BB) Epoxy-phenolic; (CC, NN) Before treatment; (DD, OO) After treatment; (EE, GG, PP, RR) Unlacquered; (FF, HH, QQ, SS) Lacquered; (II, TT) Embodiment 2; (JJ, UU) Comparison case 2; (KK, VV) Control group(untreated); (MM) Epoxy anhydride