Diseño del proceso de galvanizado para piezas eléctricas automotrices (pernos, platinas, tornillos, terminales de batería) con producción a mediana escala

Abstract

The purpose of this Curricular Integration Project consisted of designing a galvanizing process for electromotive accessories, such as: nuts, screws, bolts, etc. A small-scale laboratory replica of the process was built to obtain data that will determine the final design of the process. To achieve this, bolts of different sizes 10 and 2 centimeters and a nut were used. With this, the conditions suitable for the galvanizing process were determined, obtaining values of a 14 pH, optimum temperatures of between 18 and 22 C, and concentrations of 0.1441m3 for the water, 38.90 kg NaOH, and 5.187 kg ZnCl2, for a volume of 0.4323m3 corresponding to the design of the process. For the bath, a non-cyanide alkaline solution was chosen as electrolyte and finally it was electroplated in order to reinforce and improve the final appearance of the product. For the final design of the process, Barrel Plating was chosen due to the size of the accessories to be coated and based on the dimensioning of the barrel; the respective calculations were made to obtain the dimensions of 1.17m for the width, 1.125m for the length and 0.80m for the height of the barrel. Once the final product was obtained, the quality control according to the NTE INEN 951:2013 ELECTROLYTIC COATINGS GENERAL REQUIREMENTS, THICKNESSES AND ABBREVIATIONS and NTE INEN 1189:2013 (METALLIC COATINGS. DETERMINATION OF CORROSION RESISTANCE. TROPICALISATION TEST), standards were carried out. In turn it was recommended to be aware of the impurities as the level of purity of the substances used is important and affects the final result.