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Manufacturing processes in the electroplating industry employ hazardous chemicals and generate hazardous waste, including hexavalent chromium compounds and heavy metal cyanides. We designed a reagent-based treatment technology that can remove these contaminants and is relatively simple to implement and maintain. The technology features low reagent consumption but high treatment efficiency and simplifies separating precipitates from the treated effluent. The paper presents a detailed description of how to neutralise electroplating shop wastewater. We propose a system of organizational and technological measures to improve chemical safety.

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The purpose of this paper is to report on the results of metallographic research into the quality of X15N27T3MR-VD steel wire (EP700-VD). The reason for the research was an oxidized zone with intergranular cracking which had been detected on the surface of the wire. To remove the defects, a variety of chemical methods were applied to the surface. As the research shows, after the chemical treatment methods such as winding springs, blowing them with corundum, etching in a mixture of HNO3 and HF, and electropolishing were applied to the surface, the defects were removed completely.