Room-temperature rust removal blackening agent and preparation method thereof

Abstract

The invention discloses a room-temperature rust removal blackening agent and a preparation method thereof, and belongs to the technical field of metal surface anti-corrosion treatment. The rust removal blackening agent is prepared from a rust removal solution, a blackening solution, a composite emulsion, nano-montmorillonite, a polyaniline emulsion, texanol ester alcohol, glycerinum and deionized water. The method comprises the following steps: preparing the rust removal solution, the blackening solution and the composite emulsion, and then respectively adding the nano-montmorillonite, the glycerinum and the polyaniline emulsion to the specified amount of deionized water; adding the rust removal solution under a continuous stirring condition, stirring evenly, and slowly adding the blackening solution; further stirring and dispersing, and then slowly adding the composite emulsion; and slowly adding the texanol ester alcohol and further stirring under a room temperature condition, so as to prepare the room-temperature rust removal blackening agent. The room-temperature rust removal blackening agent disclosed by the invention can directly carry out rust removal and blackening on the steel surface to replace the technologies of acid pickling, rust removing and the like. The room-temperature rust removal blackening agent has the characteristics of high rust removal blackening speed, excellent antiseptic property and the like.

Description

Technical field: [0001] The invention belongs to the technical field of metal surface anticorrosion treatment, and in particular relates to a normal temperature derusting and blackening agent for steel surface treatment and a preparation method thereof. Background technique: [0002] At present, in order to prevent corrosion and rust of steel parts, it is necessary to carry out blackening treatment on the surface of parts. The process generally adopts degreasing→water rinsing→rust removal→water rinsing→activation→water rinsing→blackening→water rinsing→immersion and dehydration to prevent rust Oil sealing, most normal temperature blackening agents used in the prior art all contain selenide, and the price of selenide is not only expensive but also highly toxic, and long-term use will inevitably cause environmental pollution. Chinese patent CN201310199938.6 discloses a self-healing and environment-friendly steel blackening agent at room temperature. The blackening agent uses co...

AI Technical Summary

Problems solved by technology

[0002] At present, in order to prevent corrosion and rust of steel parts, it is necessary to carry out blackening treatment on the surface of parts. The process generally adopts degreasing→water rinsing→rust removal→water rinsing→activation→water rinsing→blackening→water rinsing→immersion and dehydration to prevent rust Oil seal, most normal temperature blackening agents used in the prior art contain selenides, which are not only expensive but also highly toxic, and long-term use will inevitably cause environmental pollution

Chinese patent CN201310199938.6 discloses a self-healing and environment-friendly steel blackening agent at room temperature. The blackening agent uses copper nitrate, ammonium molybdate tetrahydrate, sodium thiosulfate, sodium dihydrogen phosphate, oxalic acid, nickel sulfate, Preparation of methyl formamide, lanthanum oxide, aluminum potassium sulfate, sodium chloride, citric acid and surfactants, etc. The blackening agent has strong blackening ability, selenium-free environmental protection, simple process, and the steel obtained from blackening will turn black at room temperature The film layer has good corrosion resistance and self-healing properties, but there are shortcomings such as excessive solution precipitation, poor bonding between the blackened layer and the base metal, etc.

Chinese patent CN201110030425.3 discloses a zinc-chromium film blackening agent, the raw materials are: chlorotrifluoroethylene: 78-90%; blackening agent (carbon black): 2-5%; vinyl chlorosilane: 0.1-0.5%; Zinc dihydrogen phosphate and iron sulfate: 3-5%; Sodium dodecylsulfonate: 0.1-1%; Full methyl etherified amino resin: 0.1-0.6% mixed. The blackening layer is a film layer containing fluorinated resin. The appearance of the film layer is black and bright, which avoids the whitening phenomenon of the traditional painting process. However, the blackening agent prepared by this process has poor stability, and the dispersion of resin and carbon black is not stable enough.

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