Efficient anticorrosion zinc-type phosphating solution and preparation method thereof

Abstract

The invention discloses an efficient anticorrosion zinc-type phosphating solution and a preparation method thereof. The zinc-type phosphating solution comprises the raw material formula components of,by weight, 1-15 parts of Zn<2+>, 10-40 parts of PO4<3->, 0.01-1 part of oxidized graphene, 1-15 parts of a GO dispersing agent, 1-15 parts of a stabilizer, 5-15 parts of a pH modifier and 1000 partsof water. According to the prepared phosphating electrolyte, the safe and non-toxic effects are achieved, a phosphating film can be quickly and efficiently prepared, and especially when a metal workpiece serves as a cathode in the phosphating solution for electrolytic phosphating, the workpiece can have a smooth surface and multiple excellent properties such as scratch resistance and aging resistance. The oxidized graphene can be evenly distributed in a coating of the phosphating film, micro-holes in the surface of a phosphate film are effectively filled with the oxidized graphene, thus an isolation layer is formed, the physical shielding effect is achieved, a way through which a corrosive medium directly makes contact with the metal workpiece is blocked, occurrence of electrochemical corrosion is further inhibited, and the corrosion rate is decreased to a large extent.

Description

technical field [0001] The invention relates to a phosphating solution, in particular to a high-efficiency anti-corrosion zinc-based phosphating solution and a preparation method thereof, in particular to a phosphating solution containing graphene oxide (GO); the phosphating solution is used for metal surface treatment, The invention belongs to the technical field of phosphating anticorrosion. Background technique [0002] Metal corrosion refers to the chemical and electrochemical reactions on the surface of metal materials and the environment to degrade the performance of materials. Metal corrosion will cause huge losses. In my country, the annual loss due to corrosion accounts for about 100 million yuan. Various techniques have long been used to slow down the rate at which corrosion occurs. [0003] At present, the most important anti-corrosion method is to treat the metal surface, passivate the metal surface or isolate the external environment to achieve the purpose of ...

AI Technical Summary

Problems solved by technology

The traditional phosphating process is: degreasing-water washing-rust removal-water washing-surface adjustment-phosphating-water washing-drying, the process is cumbersome and complicated, and the film-forming principle of the phosphating film determines that there will be a treatment process Trouble, the speed of forming a phosphate film is slow or even unable to form a film

The Chinese invention patent application with the application number CN201610397553.4 discloses a formula for carbon steel pipe phosphating solution at room temperature. A large amount of toxic sodium nitrite phosphating stabilizer is added to the formula, which does not meet the requirements of environmental protection and greatly limits the its field of application

The Chinese invention patent with the application number CN201310066354.1 discloses a phosphating solution for anticorrosion of iron towers and its preparation method. The pH is 0.43, the acidity is high, and the waste liquid is difficult to handle, which also causes secondary pollution.

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