Casting surface treatment agent and preparation method thereof

Abstract

The invention relates to a casting surface treatment agent and a preparation method thereof. The invention is characterized in that the casting surface treatment agent comprises the following components in percent by volume: 5 to 30 percent of phosphoric acid, 0.05 to 5.0 percent of fatty acid salt containing 8 to 30 carbon atoms, 10 to 80 percent of monohydric alcohol containing 1 to 3 carbon atoms, 0.025 to 6.0 percent of surface active agents, 0 to 2 percent of essence or pigment and 0 to 60 percent of water. The surface treatment agent of the invention overcomes the defects of strong flavor, harmful effect to human bodies and environment pollution in the prior art. Particularly, the monohydric alcohol in the surface active agent is harmless to human bodies and the environment, in addition, the degreasing and descaling work procedures of the casting surface treatment technology are omitted, castings can be directly treated by the spray coating or soaking technology, in addition, the drying time of the castings after the treatment is short, the appearance of work pieces after the treatment is good, and the invention is more favorable for the subsequent treatment of the casting surface. The preparation of the casting surface treatment agent of the invention can adopt the existing production equipment, and in addition, the method is simple.

Description

technical field [0001] The invention relates to a casting surface treatment agent and a preparation method thereof, which is particularly suitable for the surface treatment of cast iron materials or other iron-based metal materials, and belongs to the field of metal surface treatment. Background technique [0002] The main purpose of metal surface treatment is to improve the corrosion resistance of metal materials. Using simple and safe methods for metal surface treatment has always been the goal pursued by people. However, most of the surface treatment agents used in the existing surface treatment methods contain substances harmful to the environment, such as cerium Se, chromium Cr, copper Cu, sulfur S, etc., and the surface treatment process is relatively complicated. For example: the surface treatment agent product (brand HH902) that can be used for casting blackening on the market is mainly composed of cerium Se, chromium Cr, copper Cu, sulfur S, iron Fe, and oxygen O. ...

AI Technical Summary

Problems solved by technology

The two methods disclosed above all contain heavy metal elements, strong corrosive substances, and require high processing technology; the "preparation method of blackening phosphating solution" disclosed in CN101130863 contains nickel nitrate, citric acid, sodium fluoroborate, m-nitrobenzene , sodium sulfonate, sodium tungstate and other surface treatment agents; CN1139705 disclosed "normal temperature iron and steel blackening agent" and CN1085606 disclosed "steel normal temperature rapid blackening agent" all utilize a selenium-containing system. Complex oxidation-reduction reactions and slow continuous precipitation reactions on the steel surface meet the blackening requirements, and the operation is difficult to control and complicated; while the phosphoric acid-containing surface treatment agents commonly used at present, the phosphating process includes product polishing → water washing → degreasing → Water washing→rust removal→water washing→phosphating→water washing→drying, there are too many processes