PENGARUH PROSES PAINTING PRIMER DAN TOP COAT TERHADAP DAYA REKAT CAT PADA BAJA A 36
Abstract – The painting process is the final manufacturing process caried out to protect objects from rust. In the process, many many factors that were ignored properly. These factors also determine the results and quality of painting and ability of paint to be sticked. Based on the problema above, this riset was made to study variations in surface preparation, aplicator, relative humidity primary coat and top coat on adhesion and factorial design values that can produce optima adhesion on A 36 steel in the process. Experimental design and factorial design methods with 5 factors (4 with 2 levels and 1 with 3 levels) were used based factorial design in 48 trials. The test uses a pull of test approves the ASTM D-4541 standard. The result of the pull of test influence the surface preparation factor of 0,29%, the applicator at 28,09%, the humidity of 28,09%, the primary coat at 49,97% and the top coat 10,48%. These parameters have a signficant effect. The effect of surface preparation parameters is less significant on adhesion while the applicator, humidity, type of primer and top coat have a significant effect. Sandblasting, conventional air spray, 60% humidity, epoxy and alkyd are optimal parameters for painting.