A kind of aluminum-lithium alloy pre-milling processing technology
A treatment process, aluminum-lithium alloy technology, applied in the field of aluminum-lithium alloy chemical milling pre-treatment process, can solve the problems of poor bonding force of aluminum-lithium alloy material chemical milling protective glue, batch repair of parts, over-etching of parts chemical milling area, etc. , to achieve the effect of avoiding chemical milling over erosion, simple and easy operation, and improving product quality
Active Publication Date: 2015-10-28
SHENYANG AIRCRAFT CORP
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Problems solved by technology
In the actual chemical milling production, due to the poor bonding force between the aluminum-lithium alloy itself and the chemical milling protective glue, the parts after chemical milling often have the phenomenon of over-etching in the chemical milling area (also known as: edge licking), resulting in batch repair of parts. even scrapped
Mechanical supplementary machining or new production of over-eroded parts after chemical milling is the method currently used by manufacturers. This method is inefficient, and mechanical supplementary machining is delayed, which affects product quality. Newly produced parts increase production costs, and new parts cannot be guaranteed. quality
Method used
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Embodiment Construction
[0009] A pretreatment process method for aluminum-lithium alloy chemical milling, the process method is as follows:
[0010] 1) Light emission: After the parts are mounted, immerse in nitric acid solution to emit light to remove heavy oil stains on the surface of the parts. Process control: take ρ=1.42g / mL nitric acid and prepare a 210~360mL / L nitric acid aqueous solution. Soak for 2~5min;
[0011] 2) Cold water washing: parts are washed in cold water;
[0012] 3) Alkali corrosion: remove the scale on the surface of the parts, process control: sodium hydroxide aqueous solution, 20g / L~35g / L, temperature 40~55℃, time 0.5~2min;
[0013] 4) Warm water washing: parts are washed in warm water at 40~60°C;
[0014] 5) Cold water washing: parts are washed in cold water;
[0015] 6) Lighting: restore the bright matrix of the part, process control: take nitric acid with ρ=1.42g / mL, prepare it into a 210~360mL / L nitric acid aqueous solution, and soak it until the part is shiny at room ...
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The invention discloses a pretreatment technique for lithium aluminum alloying and milling. The technique comprises the following steps: 1) emitting light; 2) washing by cold water; 3) etching by alkali; 4) washing by warm water; 5) washing by cold water; 6) emitting light; 7) washing by cold water; 8) anodizing by sulfuric acid; 9) washing by cold water; 10) filling by sodium dichromate; 11) washing by warm water; 12) spraying; 13) drying. By adopting the pretreatment technique, the binding force of spare parts and a protecting adhesive is greatly improved after the pretreatment process is improved by leading in a sulfuric acid anodizing process; the milling erosion phenomenon is avoided; the rejection rate is reduced; the product quality is improved.
Description
technical field [0001] The invention relates to a pretreatment process for aluminum-lithium alloy chemical milling. Background technique [0002] Aluminum-lithium alloys have special properties such as low density, high elastic modulus, high specific strength and high specific stiffness, and are more and more widely used in industrial industries. In the actual chemical milling production, due to the poor bonding force between the aluminum-lithium alloy itself and the chemical milling protective glue, the parts after chemical milling often have the phenomenon of over-etching in the chemical milling area (also known as: edge licking), resulting in batch repair of parts. Even scrapped. Mechanical supplementary machining or new production of over-eroded parts after chemical milling is the method currently used by manufacturers. This method is inefficient, and mechanical supplementary machining is delayed, which affects product quality. Newly produced parts increase production c...
Claims
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IPC IPC(8): C23F1/04C25D11/08
Inventor 张燕燕解二伟张雪锋
Owner SHENYANG AIRCRAFT CORP