<![CDATA[ABSTRAKPenggunaan baja di industri pertambangan salah satunya pada rockbolt. Namun sering kali karena pengaruh lingkungan, baja tersebut mengalami penurunan kualitas dan menyebabkan berkurangnya umur pakai dikarenakan terjadi korosi. Salah satu upaya untuk mencegah hal tersebut maka baja perlu dilapisi dengan material lain yang anti korosi. Penelitian ini menyelidiki pengaruh waktu perendaman pada proses hot dip galvanizing terhadap ketebalan lapisan dan laju korosi baja SS540. Proses hot dip galvanizing dilakukan dengan cara mencelupkan spesimen baja SS540 kedalam cairan zinc (Zn) pada temperatur 4500C. Waktu pencelupan divariasikan selama 30 detik, 60 detik dan 90 detik. Setelah proses hot dip galvanizing spesimen baja SS540 diuji ketebalan lapisan dan laju korosi. Ketebalan lapisan memiliki nilai Standart ISO 1461: 2009 yaitu 70 μm. Hasil uji ketebalan menunjukkan bahwa semakin lama waktu perendaman maka ketebalan lapisan pada spesimen semakin meningkat. Hasil pengujian ketebalan pada variasi waktu 30 detik sebesar 79,3 μm, meningkat sebesar 96,0 μm pada 60 detik. Sedangkan pada 90 detik meningkat menjadi 126,9 μm. Tebal tipisnya lapisan zinc pada spesimen uji juga berpengaruh terhadap laju korosi. Hasil pengamatan menunjukkan bahwa semakin tebal lapisan zinc, laju korosinya semakin rendah. Terbukti pada hasil uji laju korosi nilai terendah didapat ketika ketebalan lapisan senilai 126,9 μm dengan laju korosi 0,4924 mm/y. Sehingga lama waktu perendaman hot dip galvanizing berpengaruh terhadap ketebalan dan laju korosi. Semakin lama waktu perendaman maka semakin rendah nilai laju korosi.Kata kunci : Hot dip galvanizing, ketebalan, laju korosi ABSTRACTThe use of steel in the mining industry is one of them in rockbolt. But often due to environmental influences, the steel has decreased quality and causes reduced service life due to corrosion. One effort to prevent this is that steel needs to be coated with other materials that are anti-corrosion. This study investigated the effect of soaking time in the hot dip galvanizing process on the coating thickness and corrosion rate of SS540 steel. The hot dip galvanizing process is carried out by dipping SS540 steel specimens into zinc (Zn) liquid at a temperature of 4500C. The immersion time is varied for 30 seconds, 60 seconds and 90 seconds. After hot dip galvanizing process, SS540 steel specimens are tested for layer thickness and corrosion rate. The layer thickness has a Standard ISO 1461: 2009 value of 70 μm. The thickness test results show that the longer the soaking time, the layer thickness on the specimen increases. The thickness test results at a 30-second time variation of 79.3 μm, increasing by 96.0 μm at 60 seconds. While at 90 seconds it increases to 126.9 μm. The thickness of the zinc layer on the test specimen also affects the corrosion rate. The results showed that the thicker the zinc layer, the lower the corrosion rate. It is proven in the corrosion rate test results that the lowest value is obtained when the layer thickness is 126.9 μm with a corrosion rate of 0.4924 mm / y. So that the length of soaking time of hot dip galvanizing affects the thickness and corrosion rate. The longer the soaking time, the lower the corrosion rate value. Keywords : Hot dip galvanizing, thickness, corrosion rate]]>
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