Metal surface passivation solution

Abstract

The invention discloses a metal surface passivation solution which is characterized by comprising the following components in parts by mass: 1-3 parts of zinc nitrate, 1-4 parts of inorganic acid, 4-5 parts of water-soluble imidazoline, 2-3 parts of polycarboxylic acid, 0.1-0.3 part of phosphoryl carboxylic acid copolymer, 1-3 parts of ethylene diamine tetra (methylene sodium phosphate) and 100 parts of water. And 0.1-1 part of a defoaming agent is also included. Wherein the inorganic acid is selected from one or more of sulfuric acid, phosphoric acid and boric acid; the defoaming agent is selected from one or more of glycerol trihydroxy polyether, polyoxypropylene glycerol, polyoxyethylene oxypropylene glycerol, C7-C9 alcohol and a polyether modified silicone oil defoaming agent. The passivation solution has the following advantages that the passivation solution does not contain dichromate and nitrite, and a metal material adopting the passivation solution is excellent in corrosion resistance and adhesive force after being passivated.

Description

technical field [0001] The invention belongs to the technical field of passivation solution, and in particular relates to a metal surface passivation solution. Background technique [0002] Metals in the atmosphere will react chemically or electrochemically with oxygen, water and other impurities under certain conditions to cause metal corrosion. Metal corrosion not only damages the metal material itself in terms of its shape, color and mechanical properties, but more importantly, it reduces the quality level of its products, and damages its precision and sensitivity. Although stains from corrosion of metal surfaces can be removed from the metal substrate, these methods are often time consuming and also reduce the strength of the metal. In addition, when the metal surface is coated with polymer coatings, adhesives or rubber preservatives, the corrosion of the metal surface will cause the loss or weakening of the adhesion between the preservative coating and the metal surfac...

AI Technical Summary

Problems solved by technology

At present, the main research on chromium-free passivation technology at home and abroad includes molybdate passivation, silicate passivation, titanium salt passivation, rare earth alloy passivation, organic matter passivation and phytic acid passivation, but there is no one without Chromium passivation can completely replace the traditional chromate passivation process in production

[0005] The authorized notification number is the invention patent of CN 108546942 B, which discloses a metal surface treatment passivation solution, which solves the above problems to a certain extent, but the passivation effect of this solution on the surface of stainless steel with a large surface area is not good.