Hard chromium electroplating process

Abstract

The invention relates to the technical field of electroplating, in particular to a hard chromium electroplating process. The hard chromium electroplating process comprises the steps of plating part cleaning, acidizing and grinding, multiple cleaning and chromium plating and packaging. Cleaning equipment adopted in multi-cleaning comprises a standing bath, a water bath and a controller; brackets are arranged on two sides of the standing tank, and rotating disks are arranged on the brackets; and hanging rods which are eccentrically installed are arranged on the disks. Impurities can still remainin modeling notches in the surface of a workpiece to affect the cleaning effect of the surface of the workpiece. Therefore, the disks arranged on columns cooperate with the hanging rods eccentricallyinstalled on the disks, the workpiece in the standing tank is driven to swing under the action of the controller, the swinging workpiece is in an irregular motion state under cooperation of variable-speed drive of a servo motor, so that dead angles at the modeling notches of the workpiece are also cleaned, and the completion effect of the subsequent hard chromium plating process is improved.

Description

technical field [0001] The invention relates to the technical field of electroplating, in particular to a hard chromium electroplating process. Background technique [0002] Hard chrome plating is a traditional surface electroplating technology that has been used for more than 70 years; the chrome plating layer has high hardness, wear resistance, corrosion resistance and can maintain a bright surface for a long time, and the process is relatively simple and the cost is low; for a long time, the chrome plating layer In addition to being used as a decorative coating, it is also widely used as a wear-resistant and corrosion-resistant coating for mechanical parts; electroplating hard chromium coating technology is often used to repair damaged parts; for an introduction to the hard chromium electroplating process, see: Li Jiazhu et al., three Influencing Factors of Valence Chrome Hard Chrome Plating [J], Electroplating and Finishing, 2016(No.8).398-401. [0003] At present, the ...

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Problems solved by technology

[0003] At present, the hard chromium electroplating process will cause serious environmental problems. The chromic acid solution used in the chrome plating process will produce chromic acid mist and wastewater. The wastewater in the chrome plating process is treated to meet the discharge standards, but the cleaning steps still consume A lot of water resources, especially in the hard chrome plating process, the reuse of water resources in the cleaning process is worth improving

[0004] Some technical schemes about the hard chromium electroplating process have also occurred in the prior art, as a Chinese patent with application number 2012102109527 discloses a method for electroplating a trivalent chromium hard chromium coating on steel; using DSA anode and sulfuric acid System trivalent chromium solution, temperature around 50°C and current density of 35-65 ampere / square decimeter, through the soft start process of controlling the change of current and tank pressure during the electroplating process and maintaining the acidity within the specified range (pH0.9 ~2.1), obtained a trivalent chromium coating with a thickness of more than 80 microns, the hardness of the coating reached more than HV870, the current efficiency exceeded 35%, the highest plating rate could reach 2 microns / minute, and the bonding force of the coating passed the thermal shock test (heated at 200°C , brine quenching); this technical scheme provides a process for trivalent chromium hard chromium electroplating to replace hexavalent chromium hard chromium electroplating that seriously pollutes the environment, and solves the problem that the existing trivalent chromium electroplating technology cannot obtain thick coatings and the combination of coatings and substrates However, the hard chromium electroplating process in this technical solution also consumes a large amount of water resources to clean the workpiece, which makes the operation of the electroplating process not environmentally friendly.

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