Abstract
<p>Corrosion occurs in almost all metals. Even corrosion-resistant metals are corroded, but their corrosion rate is different from ordinary or non-corrosion resistant metals. This study examines the corrosion rate that occurs in stainless steel that is stainless steel. Stainless steel contains high enough chromium levels that can reduce the rate of corrosion that occurs. The metal material to be studied is the AISI 420 steel, which belongs to the Martensitic Stainless Steel class. This study examined the effect of heat treatment on corrosion rate and hardness level of AISI 420 steel. The heat treatment carried out was Quenching at 1020<sup>o</sup>C with a holding time of 60minutes with an oil cooling medium. After quenching the subsequent heat treatment is tempering with temperature variations of temperature 200<sup>o</sup>C and 300<sup>o</sup>C with a resistance time of 45 minutes and air cooling media. The results of this study showed that the base material specimens had the highest corrosion rate of 0.569 mm/y. The lowest corrosion rate is in specimens with quenching process with a value of 0.267 mm/y. The highest Vickers hardness values were found in specimens with quenching process with a value of 551 kg/mm<sup>2</sup>. The lowest hardness value is in the specimen with tempering process at 300<sup>o</sup>C with 405 kg/mm<sup>2</sup>.</p>
Highlights
The heat treatment carried out was Quenching at 1020oC with a holding time of 60minutes with an oil cooling medium
After quenching the subsequent heat treatment is tempering with temperature variations of temperature 200oC and 300oC with a resistance time of 45minutes and air cooling media
The results of this study showed that the base material specimens had the highest corrosion rate of 0.569 mm / y
Summary
Hampir disetiap bidang kehidupan manusia menggunakan alat bantu yang alat tersebut digunakan untuk mempermudah kehidupan manusia. Ada dua hal yang dapat digunakan untuk membedakan atau membagi korosi itu menjadi dua yaitu korosi yang disebabkan atau berasal dari bahan itu sendiri dan korosi yang disebabkan dari lingkungan. Faktor dari bahan meliputi kemurnian bahan, struktur bahan, bentuk kristal, unsur-unsur kimia yang ada dalam bahan, teknik pencampuran bahan dan sebagainya. Sedangkan faktor yang berasal dari lingkungan meliputi tingkat pencemaran udara, suhu, kelembaban, keberadaan zat-zat kimia yang bersifat korosif dan sebagainya. Korosi merupakan penyebab utama kerusakan pada suatu konstruksi yang menggunakan bahan logam, atau yang sebagian besar komponennya memakai bahan logam. Bahan-bahan korosif yaitu yang dapat menyebabkan korosi terdiri atas asam, basa serta garam, baik dalam bentuk senyawa anorganik maupun organik. Dari sekian banyak penyebab korosi dari lingkungan, hujan asam merupakan salah satu pencemaran udara yang dapat mengakibatkan korosi pada logam
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