Pengaruh Suhu Dan Campuran Accelerator (HNO2) Pada Proses Phosphating Di Aplikasi Powder Coating Mild Steel St 37 Terhadap Tingkat Kerekatan Dan Kekerasan Cat

Rohman, Hisyam Syafaat Rudini (2023) Pengaruh Suhu Dan Campuran Accelerator (HNO2) Pada Proses Phosphating Di Aplikasi Powder Coating Mild Steel St 37 Terhadap Tingkat Kerekatan Dan Kekerasan Cat. Undergraduate thesis, Politeknik Negeri Jember.

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Abstract

This study aims to determine the effect of the value of a mixture of nitric acid as much as 1.8 grams/liter, 2.7 grams/liter and 3.6 grams/liter with room temperature, 45oC and 55oC in the manganese phosphating process as much as 75 grams / liter, on powder coating applications on the level of adhesion and hardness of paint. From the results of the coating that has been made, a paint hardness test will be carried out with a pencil hardness tester tool to determine the flatness of the coating, which refers to ASTM D 3633 which is given a load of 750 grams, and the level of paint hardness is tested using a cross cut test where this tool has 6 blades to scratch the paint layer which refers to the ISO 2406: 2007 standard. The results of hardness testing conducted at the Engineering Laboratory, University of Malang obtained the highest hardness value of HB with a mixture of accelerator as much as 1.8 gr/l, 2.7 gr/l and 3.6 gr/l using a temperature of 55oC and the lowest hardness value in a mixture of HNO2 1.8 gr/l and 2.7 gr/l using room temperature with a result of 6B. From the results of the adhesion test, the highest value of 4B with a mixture of HNO2 as much as 1.8 gr/l, 2.7 gr/l and 3.6 gr/l using a temperature of 55oC have a percentage of peeling paint values of 1.696%, 3.179% and 1.696%, while the lowest value with classification 2B with a mixture of HNO2 as much as 1.8 grams/liter using room temperature has a percentage of paint peeling of 17.344%. It can be concluded that the higher temperature and the number of accelerators can increase adhesion and hardness of the paint.

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