5083 aluminum alloy plate chemical polishing process (2)

5083 aluminum alloy plate chemical polishing process (2)

(5) Polishing temperature. Temperature has an important influence on the efficiency of chemical polishing and the surface quality of 5083 aluminum alloy plate. High temperature, polishing efficiency accelerated, but there will be more gas escape, there is a possibility of gas defects. For the new preparation of chemical polishing bath, should pay attention to the temperature should not be too high; if the amount of dissolved aluminum over to a certain equilibrium level, the temperature of the chemical polishing bath to be higher. With the increase in the amount of dissolved aluminium, to maintain a certain polishing efficiency should improve the temperature of the bath. Once the temperature of the bath exceeds the set upper temperature of 105 ℃, still can not achieve satisfactory brightness, usually adjust the concentration of the bath or adjust the relative density directly related to the concentration.

(6) Transfer of aluminium profiles such as 5083 aluminium alloy sheets. After chemical polishing, aluminium should be quickly transferred to a water washing tank for mechanical washing. If the transfer is not rapid, defects in transfer leaching will occur.

(7) Water washing. Aluminium water washing is the termination of the chemical polishing process and the stagnant chemical polishing bath solution adhering to the aluminium surface must be cleaned. The use of water washing with air agitation is necessary. If a conductive sorghum is used to clean with several up and down movements, it is possible to get the aluminium clean. If the use of circulating flow of warm water (40 ℃) water washing, the effect is better.

(8) ash removal. After washing, the aluminium material is transferred to the ash removal tank liquid for ash removal, usually the ash removal tank liquid contains 25% to 50% of the volume fraction of nitric acid (relative density 1.40). 5083 aluminium alloy plate surface ash removal treatment, need to check the surface quality of chemical polishing, the surface should be flat and bright, if the surface is still attached to a slight copper characteristic colour, that indicates that the ash removal is not sufficient, need to supplement the ash removal time, if necessary, can Increase the content of nitric acid in the bath.