Four notes in the process of Extrusions oxidized aluminum profile’post-treatment

(1) rinse with hot water.The purpose of hot water washing is to age the film layer.But the water temperature and time should be strictly controlled, too high film thinned, the color became pale.Processing time is too long also can appear the similar problems, suitable temperature and time are: temperature 40 ~ 50 ° C time 0. 5 ~ 1 min

(2) dry.It is better to dry by natural air, and the workpiece washed with hot water is slanted on the shelf, so that the free water on the working surface is straight down to the bottom.The water that flows to the corner edge of lower end USES towel to absorb, the film layer color that is dried by this method is not affected, appear natural.
(3) the aging.Aging method according to climate condition to decide, there are in the summer the sun exposure in the sun, rainy or winter available oven roasted, process condition is: temperature of 10 ~ 40 ~ 50 ° C time 1 to 5 min
(4) repair unqualified parts.The unqualified conductive oxide film should be selected before drying and aging process. After drying and aging, the film layer is difficult to be removed and will affect the roughness of workpiece surface.The author has made some explorations in the process. Through various methods, it is found that the following methods are effective and simple without affecting the surface quality of the workpiece. The specific process is as follows.First, the unqualified workpiece is clamped on the clamping device for aluminum anodization. Then, the anodization process of aluminum in sulfuric acid solution is performed for 2~ 3min. After the film layer is soft and peeling, the conductive anodization can be re-conducted after the alkali solution is cleaned and the nitric acid is exposed to light.