Anhydrous phosphating agent

Abstract

The invention discloses an anhydrous phosphating agent. The anhydrous phosphating agent is prepared from, by weight, 20 parts to 40 parts of phosphoric acid, 3 parts to 15 parts of polyvinyl butyral, 3 parts to 12 parts of silicone oil, 5 parts to 10 parts of sodium borate, 8 parts to 18 parts of resin, 3 parts to 14 parts of citric acid and 30 parts to 60 parts of organic solvents. A preparation method of the anhydrous phosphating agent includes the following steps that a, mixed liquid of polyvinyl butyral resin and the organic solvents is prepared; b, phosphoric acid and citric acid organic solvent mixed liquid is prepared; and c, mixing is performed, wherein the solutions obtained in the steps of a and b, silicone oil and sodium borate are mixed according to the formula, and the phosphating agent is prepared in a stirring manner. The phosphating agent is good in phosphating effect, small in sewage discharge amount, free of corrosivity, simple in preparation process and low in cost.

Description

Technical field

[0001] The invention relates to the technical field of phosphating agents, in particular to an anhydrous phosphating agent. Background technique

[0002] Phosphating treatment is to use the cleaned metal surface under the action of phosphating solution to form a non-metallic, non-conductive, porous phosphoric acid conversion film through a chemical reaction to facilitate the physical properties of the coating oil film. The process of immersing steel, aluminum or zinc workpieces in a specific phosphating solution based on acid phosphate and depositing a water-insoluble crystalline phosphate conversion coating on the surface is called phosphating. There are many classifications of phosphating processes. According to the composition of the phosphating solution, it can be divided into zinc-based phosphating, zinc-calcium-based phosphating, iron-based phosphating, manganese-based phosphating and composite phosphating.

[0003] The currently commonly used phosphat...