Hard chromium plating process of hard film mould of rubber component

Abstract

The invention discloses a hard chromium plating process of a hard film mould of a rubber component, comprising the steps of pre-cleaning, activation, hard chromium plating, post-cleaning, deoxidization and detection of the hard film mould. The hard chromium plating process is characterized in that plating solution chemical components subject to the hard chromium plating comprises the following contents: 200-250g / L of chromium trioxide, 1-1.2g / L of SO4<2-> ion and 3-4g / L of Cr<3+> ion; the temperature of the plating solution in electro-plating is between 55 DEG C and 60 DEG C, the concentrationof anode current is between 25A / dm<2> and 45A / dm<2> and the electro-plating time is between 25 minutes and 40 minutes; and the anode material for the hard chromium plating selects lead-tin alloy materials which contain 7-10 percent of tin. The invention ensures that a groove of the hard film mould has even hard chromium plating, improves the production efficiency and prolongs the service life ofthe hard film mould.

Description

technical field [0001] The invention relates to a hard chrome plating process, in particular to a hard chrome plating process for a film mold of rubber parts. Background technique [0002] The characteristics of the traditional metal surface hard chromium plating process: 1. Low anode current efficiency (between 8-13%); 2. Poor throwing ability and depth capability; 3. Low surface hardness of the coating (HV01 600-900); 4. The glossy area of ​​the coating surface is narrow; 5. The density is low and there are many pores; 6. The process requirements are strict, and the operation is difficult to meet the requirements; 7. For the complex geometry of the mold such as the rubber film of our company, it is almost impossible to obtain a uniform coating by using the traditional process. Impossible to obtain, for the film lower mold width 5-7mm deep 40-60mm groove solution deep plating can not be plated to let alone have a uniform coating, when this type of mold is used, the working ...

AI Technical Summary

Problems solved by technology

[0002] The characteristics of the traditional metal surface hard chromium plating process: 1. Low anode current efficiency (between 8-13%); 2. Poor throwing ability and depth capability; 3. Low surface hardness of the coating (HV01 600-900); 4. The glossy area of ​​the coating surface is narrow; 5. The density is low and there are many pores; 6. The process requirements are strict, and the operation is difficult to meet the requirements; 7. For the complex geometry of the mold such as the rubber film of our company, it is almost impossible to obtain a uniform coating by using the traditional process. Impossible to obtain, for the film lower mold width 5-7mm deep 40-60mm groove solution deep plating can not be plated to let alone have a uniform coating, when this type of mold is used, the working temperature is (150-230° ) is highly corrosive to the metal surface. This type of mold is a difficult mold with high manufacturing cost. In this case, the service life is low. Once the surface is deeply corroded, the scrap of the mold will directly affect the product benefit, and in the production process The number of decontamination in the medium, increasing the impact on production efficiency, and using sandblasting also generally reduces the service life of the mold