The metal finishing processes improve the surface of a basic material by cleaning it, hardening or softening it, smoothing or roughening it, depositing another metal on it by chemical exchange, electroplating another metal or series of metals on it, converting its surface by chemical deposition, coating it with organic materials, and oxidizing by electrolysis.
While metal finishing processes using materials which may generate hazardous wastes; such as spent plating solutions, all cyanides, acidic, alkaline, heavy metal, cleaning and stripping bath solution, heavy metal sludges.
The first question that should always be asked of an electroplating job is "How is your waste treated?" Since our start in 1973, we have taken this more seriously than any other aspect of our business.
Using checklists can help us to create unnecessary waste, labor, and paper work problems. This is for checking if any waste reduction strategies can cause problems.
Before Plating Process; we examine these issues.
- Inspection of all parts before plating
- Ensure that surfaces are clean, dry, and free of rust and mill scale. Unclean surfaces may be responsible for producing a poor quality product and shortening process and rinse bath life.
- Mechanically cleaning parts
- Clean parts using a wire brush or other mechanical means whenever possible. This reduces the amount of solvent needed for cleaning parts.
- Continuously monitor baths
- Monitor bath characteristics such as pH, chemical concentrations, and metal content to maintain the baths. Many plating processes have ideal operating ranges. Making the necessary adjustments will extend bath life.
- High bath life extended by filtration or precipitation
- Remove bath contaminants and extend bath life using continuous filtration. Filtration systems remove accumulated solids that reduce process bath effectiveness.
- Using Non-chelated process chemicals
- Non-chelated process chemicals decrease sludge volume because additional chemical treatment is not necessary. Non-chelating chemicals can be used for processes in which it is not necessary to keep metals from adhering to work piece surfaces.
- Replace cyanide process baths with non- cyanide process baths to simplify treatment required
- Replace cyanide process chemicals with non-cyanide process chemicals. Waste stream treatment of free cyanide involves chemicals that increase waste sludge volume.
- Keep waste streams segregated
- Segregate waste streams to increase wastewater treatment efficiency and recovery efficiency. Segregate acidic from alkaline wastes, chrome from non-chrome containing wastes, chelated from non-chelated wastes, and cyanide from non-cyanide-containing wastes.