[unimüts]

5.6. REMOVAL OF COATING. Low-grade chromium coatings can be easily removed spoverkhnosti of article. The chrome-plated details, prepared from steel and alloys on the copper basis, process at room temperature in the hydrochloric acid, diluted 1:1. Chromium is dissolved sufficiently energetically; for accelerating the process the solution podogrevayetsya to 35-40o. For convenience in the observation of the dissolution of chromium of detail one should load into the bath on the grids from polyvinyl chloride plastic. This method is unfit for the details, whose saturation by hydrogen is not allowed, for example, for the cast iron piston rings. The method, which consists of the anodic dissolution of chromium in the alkali, adapts for such details. For the removal of chromium they curtain article to the anodic rod in the bath with 15-20- percent solution of the caustic soda. Anodic etching is produced with room temperature and anodic current density of 10-15 a/dm2. Steel plates serve as cathodes. In the solution the presence of chlorine ions, which facilitate the dissolution of the base metal of detail, is not allowed. The removal of chromium can be produced also by the anodic dissolution of coating in the chromium electrolyte. However, made this in the bath of chromium-plating should not be in view of the pollution of electrolyte by iron and a strong increase in the concentration of trivalent chromium. This method can be rekomendovan for the removal of chromium from the aluminum details. Resultant in this case on the surface of aluminum oxide film is moved away by cleaning by its emery cloth or by dissolution in the alkali. But preparation - it is good to wash detail in solvents. For the removal of coating this it will be sufficiently.


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