Blackening technology for copper product

Abstract

The invention discloses a blackening technology for a copper product. The technology includes the following steps that 1, degreasing and decontaminating are performed, and specifically, stains on thesurface of the product are removed; 2, overflowing and rinsing are performed, and specifically, the stains on the surface of the product are washed; 3, pickling and activating are performed, and specifically, oxides on the surface of the product are removed; 4, overflowing and rinsing are performed, and specifically, the stains are washed; 5, blackening for the first time is performed, and specifically, a light-color blackening layer is formed; 6, overflow and rinsing are performed; 7, blackening for the second time is performed, and specifically, a stable blackening layer is formed; 8, overflow and rinsing are performed; 9, sealing is performed, and specifically, an anti-oxidation film is formed outside the blackening layer of the finished product; 10, overflow and rinsing are performed;11, drying is performed; 12, vibration and grinding are performed to remove dust, and specifically, accumulated dust and impurities on the surface of the product are removed. According to the blackening technology of the copper product, the requirements that the blackening layer of the product does not leak copper in a long-time salt spray test and does not fade for a long time in high-temperature, high-humidity, thermal-shock and low-temperature cold-shock continuous tests can be met, and the product has the good light reflection resistance and refraction resistance.

Description

technical field [0001] The invention relates to the technical field of metal blackening treatment, in particular to a copper product blackening process. Background technique [0002] Blackening (bluening) technology is widely used in the protection and decoration treatment of the surface of tools, measuring tools, fasteners, instruments, mechanical parts, photographic equipment and military products. The traditional blackening process uses a high-temperature alkaline oxidation system containing sodium nitrite, which needs to be treated at about 140°C for 30-90 minutes, or even longer. It also has the disadvantages of high energy consumption, long production cycle, especially the carcinogenic effect of sodium nitrite, poor working conditions, and environmental pollution. Due to these problems, people have devoted themselves to the research and development of the normal temperature blackening process in recent years, and corresponding normal temperature blackening agent produ...

AI Technical Summary

Problems solved by technology

[0003] At present, for the blackening treatment of copper products, copper lens or gasket surface, the traditional blackening method used in metal parts is usually adopted. The original blackening line is mainly suitable for the blackening treatment of the surface of auto parts. Salt The fog test and various physical tests have low requirements; the salt spray test and various physical tests of optical lens products have high requirements, and the original blackening process is used for blackening, and the salt spray test and physical dependence test after blackening cannot meet the requirements. According to the customer's technical requirements, copper leakage will occur after more than 90 hours of salt spray test, and discoloration will occur in continuous tests of high temperature, high humidity, thermal shock, and low temperature cold shock