Long-life aluminum and alloy oil removing activating solution and application

Abstract

The invention provides a long-life aluminum and alloy oil removing activating solution and application, and belongs to the technical field of metal surface treatment. The long-life aluminum and alloy oil removing activating solution is prepared from, by concentration, 25-70 g / L of sodium hydroxide, 5-8 g / L of an addition agent and the balance water. The accumulation amount of the sodium hydroxide in the solution is 140 g / L. Dynamic balance is achieved. The addition agent is prepared from, by concentration, 250-282 g / L of 1,2,5,6 sorbitol or 280-320 g / L of sodium gluconate, 3.5-4.5 g / L of ethylenediaminetetraacetic acid disodium, 4-15 g / L of sodium thiosulfate, 3.5-5.5 g / L of sodium hexametaphosphate, 1.5-3 g / L of sodium pyrophosphate, 1.5-3 g / L of nonylphenol polyoxyethylene ether, 1.5-3 g / L of fatty alcohol-polyoxyethylene ether 0-20, 1.5-3 g / L of sodium diethylhexyl sulfosuccinate, 0.5-1.5 g / L of 2-naphthalenesulfonic acid formaldehyde olymer sodium salt and 25 g / L of sodium hydroxide. The oil removing activating effect is remarkably improved, extruding and machining tool marks are eliminated, and the leveling effect is achieved. Alkali consumption is greatly reduced, and the service life of a bath solution is prolonged by 40-50 times. Production efficiency is improved by more than 25%-30%.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to a long-life aluminum and its alloy degreasing and activation solution and its application. Background technique [0002] Aluminum alloy parts should be degreased and activated before the electrochemical oxidation of the surface. It is beneficial to the formation of electrochemical oxide film with protective function; 2) Alkali is very corrosive to aluminum alloy, so the degreasing and activation process of lye can also reduce or eliminate the mold left in the processing of aluminum parts to varying degrees 3) In order to obtain a good electrochemical oxidation film and uniform color on aluminum alloy parts, a uniform oxide film barrier layer should be obtained first, and only the surface after degreasing and activation A uniform barrier layer can be obtained only when it is uniform and smooth, especially for aluminum alloy parts that are to be colored after oxida...

AI Technical Summary

Problems solved by technology

[0003] However, the previous degreasing and activating solution is composed of 25-45g / L industrial grade sodium hydroxide and tap water, which has the following disadvantages: 1) Due to the single composition of the bath solution, it does not have the leveling ability

During the replacement, the sediment is stubbornly attached to the tank wall and the heating pipe, which is very difficult to clean and also affects the thermal efficiency

3) Replace the tank solution once, and the tank solution should be completely discharged during the replacement, and a large amount of acid will be consumed to neutralize it during the discharge process, so that the discharged degreasing and activating tank solution can meet environmental protection requirements and increase costs

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