Aluminum alloy surface antiseptic protectant and antiseptic method

[0026] The technical solutions of the present invention will be described in detail below through specific embodiments. These embodiments are only used to explain and describe the present invention and cannot be understood as limiting the present invention.

[0027] An anticorrosive protective agent for aluminum alloy surface, characterized in that: its composition includes 2-mercaptobenzothiazole MBT, 2-mercaptobenzimidazole MBI, 2-mercaptobenzoxazole MBO, benzotriazole BTA, and polyacrylate , High-density polyethylene, lubricants and surfactants. The amount of high-density polyethylene is 3-5% by weight; the amount of polyacrylate is 3-5% by weight.

[0028] In terms of weight percentage, the 2-mercaptobenzothiazole MBT: 2-mercaptobenzimidazole MBI: 2-mercaptobenzoxazole MBO: benzotriazole BTA is 2:1:1:1. The lubricant is one or a combination of stearic acid, butyl stearate or oleamide.

[0029] The surfactant is one or a combination of nonylphenol polyoxyethylene, fatty acid polyoxyethylene ether sodium sulfate or fatty acid polyoxyethylene ether ammonium sulfate.

[0030] A method for preparing a low-temperature corrosion protection agent for aluminum alloy surface is to combine 2-mercaptobenzothiazole MBT, 2-mercaptobenzimidazole MBI, 2-mercaptobenzoxazole MBO and benzotriazole BTA in proportions. Acrylic resin and high-density polyethylene are added to a sealed container containing organic solvents, and the water bath is heated and stirred to dissolve the complexing agent. The temperature of the water bath is 30-60°C, and the best choice is 30-40°C. The percentage is 1.0% of the solution, and then add 1/2 of the total weight of the above four substances as a lubricant and the same surfactant as the total weight of the above four substances.

[0031] The organic solvent is one or more combinations of dichloroethane, trichloroethane, trichloromethane, ethanol, acetone or epichlorohydrin.

[0032] The low-temperature anti-corrosion method of the aluminum alloy surface includes the following steps:

[0033] 1). Pre-coating treatment: Use mechanical, chemical or electrochemical methods to reduce dust and remove oil stains and various corrosives. If the aluminum alloy is electroplated, it is not necessary to do pre-coating treatment;

[0034] 2) Phosphating: prepare NaH 2 PO 4 -H 3 PO 4 The solution is used as a phosphating agent; the phosphating time is 3 minutes.

[0035] 3) Cleaning: Degreasing with absolute ethanol first, and then cleaning the workpiece with distilled water to clean the surface and make it neutral;

[0036] 4) Drying: The aluminum alloy workpiece must be dried before coating to avoid contact between the protective agent and water during coating, which will affect the effect, and keep the weight in a drying oven;

[0037] 5) Coating: Coating the clean and dry aluminum alloy workpiece with an anticorrosive protective agent; the coating can be dipping, brushing, spraying or curtain coating. If the dip plating method is selected, the dip plating time is 15-20 min.

[0038] 6) Drying: Place for 1-2 minutes under ventilated conditions.