Pengaruh Temperatur Aging Dan Waktu Tahan Post-Heat Pada Proses Copperizing Terhadap Kekerasan, Ketahanan Korosi , Serta Struktur Mikro Baja Aisi 1006

Baja karbon sudah cukup memuaskan untuk digunakan untuk kebutuhan dalam industri. Pennambahan Cu pada baja struktur telah dilakukan untuk meningkatkan ketahanan korosi. Penelitian ini dilakukan penambahan Cu melalui proses difusi pada permukaan baja menggunakan metode copperizing. Setelah itu diberikan proses tambahan yaitu pemanasan pada temperature 11000 C. Setelah itu dilakukan proses water quenching. Kemudian dilakukan proses aging pada temperature yang divariasikan. Struktur mikro sampel hasil copperizing adalah quasi-polygonal dan acicular ferrite, Semakin tinggi temperature aging semakin besar ukuran butir sampel, semakin lama waktu post-heat yang diberikan semakin banyak acicular. Kekerasan maksimum berada pada sampel dengan proses copperizing dan diberi post-heat 20 menit dan di-aging pada temperature 4000 C dengan nilai kekerasan 192.77 HV. Laju korosi saja berkurang dengan adanya proses copperizing karena pada sampel hasil copperizing membentuk lapisan Cu2O yang menghambat laju korosi. =========================================================== Low carbon steel is already have many beneficial for industrial need, but in some other way low carbon steel cannot meet the requirement for used.. Each alloying elements give different effect for steel. Cu in structural steel is proved to strengthen its corrosion resistance. In this study addition of Cu is done by diffusion process in steel’s surface. After the process copperizing is given an additional process of heating at a temperature 11000 C is done and continued with the process of water quenching. Then aging process in to be done in some temperature variation. The microstructure obtained after copperizing process are acicular and quasi-polygonal ferrite. The increasing of aging temperature caused the structure to grow and reduce acicular ferrite content. The longer post-heat temperatur the more acicular ferrite obtainned in steel. The highest hardness obtained is at copperizing sampel with 20 minutes post-heat followed with 4000 C aging temperature, the value is 192.77HV. Corrosion rate of steel decrease in copperized sample, it is caused by Cu2O layer formed in the sample’s surface