Optical reflectivity surface treatment method

Abstract

The invention discloses an optical reflectivity surface treatment method. The optical reflectivity surface treatment method comprises the following steps that a product is placed on a product fixing frame, product surface oil contamination is removed through degreasing an water washing working procedures, and the product is cleaned; primary anodic oxidation treatment is carried out, and a sulfuricacid solution is adopted for carrying out primary anodic oxidation on the product; water washing is carried out after primary anodic oxidation, an alkaline solution is used for neutralization, and cleaning is carried out through water washing; sealed pretreatment is carried out, an activating agent is adopted for carrying out sealed pretreatment on the product; neutralization and water washing treatment is carried out after sealed pretreatment; secondary anodic oxidation treatment is carried out, and a sulfuric acid solution is adopted for carrying out secondary anodic oxidation on the product; water washing and neutralization are carried out after secondary anodic oxidation treatment, and water washing treatment is carried out; sealing treatment is carried out, and nickel fluoride and activating agent are adopted for carrying out sealing treatment on the product; and after sealing treatment, cleaning, drying and appearance detection are carried out, and the product is packaged. The product surface optical reflectivity is effectively reduced.

Description

technical field [0001] The invention relates to a surface treatment process, in particular to an optical reflectivity surface treatment method capable of effectively reducing the optical reflectivity of a metal surface. Background technique [0002] On the surface of many products, especially the products with high requirements on the surface quality of the shell, the surface of the product is generally processed, and most of them are blackened. At present, there are two main methods of blackening the product; one is the surface of ordinary products. Blackening treatment is generally a chemical reaction under the condition of high temperature solution (alkali + ammonium nitrite + water). Its purpose is mainly to prevent rust, not for appearance parts and precision products. Electrolytic reaction occurs in sulfuric acid solution, this method is mainly for products with high requirements on appearance and dimensional accuracy. However, for some optical components, not only th...

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Problems solved by technology

[0003] The existing surface treatment mainly includes normal temperature blackening treatment and ordinary anodic oxidation on the surface of ordinary products, and the disadvantages of the normal temperature blackening treatment process on the surface of ordinary products are 1. The film formed by conductive oxidation is only 0.01-0.15 microns, and the wear resistance is not good ; 2. The oxide film is thin, easy to conduct electricity, and cannot be used as an insulation protection product; 3. After blackening, the blackened layer only absorbs a small amount of light, and most of it is reflected, and the reflectivity is high (the reflectivity is above 80%) )

[0004] The disadvantages of ordinary anodizing are 1. Compared with optical black anodizing, the oxide film is wear-resistant, light-resistant, and light-resistant; 2. After ordinary anodizing, the blackened layer also absorbs part of the light. Reflection (reflectivity above 60%)

[0005] At present, there is no blackening process that can reduce the optical reflectance of the product surface to a very small value. The general blackened surface treatment can only reduce the optical reflectance to about 60% at most.

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