Method for coating reflection cup of car lamp

Abstract

The invention discloses a method for coating a reflection cup of a car lamp. The method is characterized in that the method comprises the following steps: (1) activation and cleaning treatment: carrying out activation and cleaning treatment on the surface of the reflection cup, wherein the treatment time lasts for 80-120 S, the vacuum degree in a vacuum chamber reaches 45-60 Pa, and the voltage of a coating electric cabinet output to the vacuum chamber through voltage transformation is 3,000V; (2) evaporation coating of an aluminum film: the aluminizing thickness is not more than 300nm; and (3) coating of a protective film: the voltage of a coating electric cabinet output to the vacuum chamber through voltage transformation is 3,000V, and the thickness of the coated protective film is 2.5-3.0 micrometers. As the method is used, the protective film has acid resistance and alkali resistance and does not fall off after being dipped in hydrochloric acid of concentration 1% or sodium hydroxide of concentration 1% and in water of 50 DEG C for 24h; and as a vacuum coating technology is used, the problem of nonuniform film thickness caused by manual spraying is effectively solved and the quality of the car lamp is greatly improved.

Description

technical field [0001] The invention relates to the technical field of vacuum coating, in particular to a method for coating a car lamp reflector cup. Background technique [0002] At present, the reflective film on the reflective cup of the automobile lamp is mostly prepared by vacuum evaporation and aluminum plating. The reflective film prepared in this way has the advantages of high reflectivity and low price, and the current process is stable and mature. However, due to the poor anti-oxidation and corrosion performance of the aluminum film itself, and it often works under high temperature conditions, if it is not used under the condition of preparing a protective film on the surface, it will inevitably oxidize and turn yellow, reducing its optical performance. At present, the preparation of the protective film of lamps and lanterns mostly adopts the artificial surface spraying organic layer as the protective film, because the process is not completed under vacuum conditi...

AI Technical Summary

Problems solved by technology

However, due to the poor anti-oxidation and corrosion performance of the aluminum film itself, and it often works under high temperature conditions, if it is not used under the condition of preparing a protective film on the surface, it will inevitably oxidize and turn yellow, reducing its optical properties.

At present, the preparation of the protective film of lamps and lanterns mostly adopts the artificial surface spraying organic layer as the protective film, because the process is not completed under vacuum conditions, so the surface of the aluminum film will be corroded, and the coating will also be polluted to varying degrees, reducing the overall The performance of the car lights; more importantly, the sprayed organic coating has poor chemical stability. Under the environment of high temperature and ultraviolet light, its transmittance will be greatly reduced, thereby reducing the reflectivity of the car lights

Coupled with the poor stability of the artificial spraying process, the reflectivity of the car lights prepared by this process is about 75%, which can no longer meet the requirements of high-end cars for lamps.

[0003] Recently, someone proposed to use the monomer to form a protective film on the surface of the car lamp in the environment of ion glow discharge under vacuum conditions. This method can effectively solve the shortcomings of the artificial spraying process, but due to the coating process, The relevant technical parameters controlled are not reasonable, so that the thickness of the protective film produced is relatively thin, which cannot well meet the national standard requirements of the national standard for the protective film on the surface of the car lamp