Aluminum alloy silicon-free efficient degreasing fluid and preparation method thereof

Abstract

The invention relates to the field of aluminum alloy surface treatment, in particular to an aluminum alloy silicon-free efficient degreasing fluid and a preparation method thereof, which can be used for solving the problem that an aluminum alloy degreasing agent forms gel easily, adheres to the surface of the substrate and is difficult to remove in the presence of silicate in the prior art. The silicon-free efficient degreasing fluid comprises an alkali metal hydroxide, phosphate, a buffering agent, a corrosion inhibiting agent, a surfactant and the like, and comprises the balance of water besides silicate, wherein the pH value is 10-12; the working temperature is 40-60 DEG C; the alkali oxide content is 1-10 g / L; the phosphate content is 8-30 g / L; the buffering agent content is 5-20 g / L;the corrosion inhibiting agent content is 0.5-3 g / L; and the surfactant content 0.5-5 g / L. In the invention, the degreasing fluid is prepared by uniformly mixing alkali metal oxide, phosphate, a buffering agent, a corrosion inhibiting agent, a surfactant and water. The silicon-free efficient degreasing fluid has superior decontamination capability, and can be widely used for cleaning the surfacesof various aluminum alloy workpieces.

Description

technical field [0001] The invention relates to the field of aluminum alloy surface treatment, in particular to an aluminum alloy silicon-free high-efficiency degreasing liquid and a preparation method thereof. Background technique [0002] Aluminum alloy workpieces usually need to be degreased before surface treatment such as electroplating, chemical conversion, anodic oxidation, etc., to remove oil and other pollutants on the surface of the workpiece. At present, commonly used degreasing agents for aluminum alloys usually add silicate to enhance emulsifying ability and corrosion inhibition performance. However, silicates tend to form colloids and adhere to the surface of the substrate and are difficult to remove. In addition, in order to enhance the degreasing ability, these degreasing agents often need to use high temperatures above 70°C, which will increase the cost of degreasing treatment and waste energy. Contents of the invention [0003] The purpose of the present...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a silicon-free high-efficiency degreasing liquid suitable for aluminum alloy substrates and its preparation method, which can solve the problem in the prior art that aluminum alloy degreasing agents are easy to form colloids attached to the surface of the substrate and difficult to remove.

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