Estudio de la calidad superficial de la película seca de pintura en las carretillas mediante el proceso de detección de discontinuidades (HOLIDAYS), en la empresa I.M.ESCO de la ciudad de Ambato

Abstract

The experimental work is about the study of the application process of monolayer powder electrostatic coating, in the smooth surface of the wheelbarrow components of the I.M.ESCO company and it was compared with the same process but in rough surface. The coating used is of hybrid epoxy-polyester type, in scarlet red color and the smooth surface preparation is carried out by means of a chemical wash with deoxidizer, while in order to obtain a rough surface, it was complemented with a cleaning by means of sand blasting using mineral grit, based on the code SSPCSP10. Witness plates were used for the control of the paint film surface quality; in the case of thickness measurement, five spots were established with three measuring points in each case, while for the adhesion control by cross-hatching two sets of lines were made, which are cut at right angles to obtain a plot of 36 squares; For the test by hydraulic thrust, dollies were placed on the control plate, which were detached by the pressure. Regarding the detection of the holidays, a micro-hole detector equipment was used that was used directly on the surface of the wheelbarrow components. It was determined that the most suitable electrostatic painting process to achieve a high level of surface quality of the dry film of paint in the wheelbarrow is achieved by preparing the surface with a chemical wash with phosphatizing deoxidizer and abrasive sand blasting with mineral shot, with a curing mechanism convertible by melting in a drying oven for 10 minutes.