Polyaniline type normal-temperature blackening agent as well as preparation method and application thereof

Abstract

The invention discloses a polyaniline type normal-temperature blackening agent as well as a preparation method and application thereof, and relates to the technical field of metal surface treatment. The polyaniline type normal-temperature blackening agent is prepared from the following components in parts by weight: 0.1 to 1.5 parts of copper sulfate pentahydrate, 0.1 to 2.5 parts of sodium tungstate dihydrate, 0.5 to 12 parts of polyaniline reaction liquid, 0.05 to 1.2 parts of nickel sulfate, 0.1 to 1.3 parts of sodium thiosulfate, 0.05 to 1.2 parts of disodium 1-hydroxyethylidene-1, 1-diphosphonate, 0.01 to 1.0 part of fatty alcohol-polyoxyethylene ether and a proper amount of deionized water. In the components, copper sulfate pentahydrate, sodium tungstate dihydrate and polyaniline reaction liquid are used as main film-forming substances, nickel sulfate is used as a secondary film-forming substance, sodium thiosulfate is used as a film-forming aid, disodium 1-hydroxyethylidene-1, 1-diphosphonate is used as a chelating agent, and fatty alcohol-polyoxyethylene ether is used as a dispersion stabilizer. The finally formed blackening film can cut off the direct connection between metal and oxygen, meanwhile, the continuous protection effect can be achieved, and under the combined action of all the components, the corrosion resistance is obviously improved.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to a polyaniline-type normal-temperature blackening agent and its preparation method and application. Background technique [0002] The blackening treatment of steel is a surface treatment technology that can generate a layer of protective compound on the surface of steel workpieces to improve corrosion resistance. The blackening agent is a chemical preparation to achieve blackening treatment of steel. [0003] At present, the commonly used blackening methods of iron and steel materials are: alkaline chemical oxidation method and acidic chemical oxidation method (blackening at room temperature). The alkaline chemical oxidation method is treated at a high temperature of 135-150 ° C for 30-90 minutes. The film layer is fine, uniform, bright black, high fastness, and good corrosion resistance; but there are long production cycles, high energy consumption, and poor worki...

AI Technical Summary

Problems solved by technology

However, most of the blackening agents contain phosphorus, selenium, nitrite and other polluting substances or the process is complicated and the cost is high, and after blackening the cast iron, in order to prevent the surface from rusting, it is necessary to immerse another kind of blackening agent. Anti-rust treatment is carried out in solvents, but the function of blackening and anti-rust cannot be achieved at the same time, which increases the complexity of operation

How to improve the overall performance of the blackening film, especially the antirust performance has become a new topic, but there is no report on the results of the high corrosion resistance blackening agent