Phosphorus-free degreaser for surface spraying pretreatment of steel

Abstract

The invention relates to a steel surface spraying process, and particularly relates to a steel surface spraying pretreatment agent. The phosphorus-free degreaser for surface spraying pretreatment of steel is a mixed solution prepared from the following components in mass concentration: 15-30 g / L anhydrous sodium metasilicate, 5-10 g / L sodium carbonate, 4-6 g / L alkylphenol ether sulfosuccinate sodium salt, 2-4 g / L sodium lauryl sulfate, 5-10 g / L fatty alcohol-polyoxyethylene ether, 2-4 g / L isopropanol, 0.2-0.4 g / L defoaming agent FAG470, 0.5-2.5 g / L disodium edetate and the balance of water. The invention can realize thorough degreasing at normal temperature, and is easy to perform cleaning operation and low in foam.

Description

technical field [0001] The invention relates to a steel surface spraying process, in particular to a steel surface spraying pretreatment agent. Background technique [0002] At present, most of the degreasing agents used in the pre-treatment of steel surface spraying in the industry have high treatment temperatures and contain phosphates that will aggravate the eutrophication of water bodies, which affect the environment; while non-phosphorus degreasing agents contain sodium hydroxide, which has poor cleaning performance after degreasing, Sodium orthosilicate, or the amount of surfactant is too high, there are problems of incomplete cleaning or excessive foam. [0003] In the prior art, the degreasing agent formula generally contains sodium alkylbenzene sulfonate. Although it has strong emulsifying power and degreasing power, the foam stability is too strong and it is combined with calcium and magnesium ions in water. Calcium salt that is difficult to dissolve in water, Aff...

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Problems solved by technology

[0002] At present, most of the degreasing agents used in the pre-treatment of steel surface spraying in the industry have high treatment temperatures and contain phosphates that will aggravate the eutrophication of water bodies, which affect the environment; while non-phosphorus degreasing agents contain sodium hydroxide, which has poor cleaning performance after degreasing, Sodium orthosilicate, or the amount of surfactant is too high, there is a problem of incomplete cleaning or excessive foam

[0003] In the prior art, the degreasing agent formula generally contains sodium alkylbenzene sulfonate. Although it has strong emulsifying power and degreasing power, the foam stability is too strong and it is combined with calcium and magnesium ions in water. Calcium salt that is difficult to dissolve in water, Affect degreasing effect and cleanliness

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