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Abstrak :
Saat ini, asam sulfamat sebagai bahan industri kimia utama ada di mana-mana. Karena sifatnya yang korosif, maka perlu menggunakan wadah khususnya fungsi penukar panas yang sesuai untuk menghindari kontaminasi larutan. Perilaku korosi baja tahan karat super austenitik, duplex 2205, dan 316L yang terpapar asam sulfamat diteliti dengan menggunakan Metode Kehilangan Berat, Polarisasi dan EIS. Dalam pengujian kehilangan berat, diberikan variasi konsentrasi dan temperatur selama 1 sampai 5 hari paparan. Sedangkan metode pengujian dengan Polarisasi dan EIS dilakukan pada temperature 25°C dengan variasi konsentrasi. Untuk mendukung hasil pengujian korosi, dilakukan karakterisasi pada sampel uji maupun larutannya menggunakan XRD, AAS dan OES. Sedangkan pengamatan visualisasi permukaan produk korosi dilakukan dengan Mikroskop Optik dan SEM-EDS. Hasil penelitian menunjukkan bahwa laju korosi material cenderung meningkat dengan meningkatnya konsentrasi asam sulfamat dan menurun ketika mendekati konsentrasi 80% berat. Baja tahan karat super austenitik memiliki laju dan arus korosi paling kecil serta impedansi yang paling besar daripada duplex 2205 dan 316L. Kesimpulan menunjukkan bahwa material super austenitic stainless steel sangat cocok digunakan di lingkungan asam sulfamat dengan berbagai variasi konsetrasi dan temperatur. ......Currently, sulfamic acid as the main chemical industrial ingredient is ubiquitous. Due to its corrosive nature, it is necessary to use a container especially a suitable heat exchanger function to avoid contamination of the solution. The corrosion behavior of super austenitic, duplex 2205, and 316L stainless steels exposed to sulfamic acid was investigated using the Weight Loss Method, Polarization and EIS. In the weight loss test, various concentrations and temperatures for 1 until 5 days of exposure. While the testing method with Polarization and EIS was carried out at a temperature of 25°C with various concentrations. To support corrosion test results, characterization of the sample and solution was carried out using XRD, AAS and OES. Meanwhile the observation of the surface visualization of corrosion products was carried out with an Optical Microscope and SEM-EDS. The results showed that the corrosion rate of the material tends to increase with increasing concentration of sulfamic acid and decrease when approaching a concentration of 80% by weight. Super austenitic stainless steel has the lowest corrosion rate and current and the highest impedance than duplex 2205 and 316L. The surface morphological characteristics of corrosion products are different for the three materials. In 316L, show pattern intergranular corrosion and selective dissolution patterns are seen at duplex 2205, while at SASS there is no corrosion pattern. The conclusion shows that the super austenitic stainless steel material is very suitable for use in a sulfamic acid environment in various concentrations and temperature.

Abstrak :
Perilaku korosi dari baja tahan karat duplex 2205 dan feritik 410s diamati dalam berbagai konsentrasi larutan sodium klorida. Rangkaian pengujian dilakukan dengan menggunakan metode Electrochemical Impedance Spectroscopy pada suhu ruang. Metode ini dilakukan untuk mengamati impedansi dari material uji. Konsentrasi larutan klorida disiapkan dengan variasi 1, 2, 3, 4 dan 5 w.t. Hasil pengujian terhadap kedua sampel menyatakan bahwa sistem dengan ketahanan korosi paling rendah adalah sistem yang menggunakan 3,5 w.t sodium klorida, yang serupa dengan kandungan klorida air laut. Hasil pengujian juga menyatakan bahwa baja tahan karat duplex 2205 secara umum lebih tahan korosi dibandingkan dengan feritik 410s pada setiap konsentrasi klorida. ......Corrosion behaviour of SS 2205 and SS 410s were investigated in various concentrations of aqueous sodium chloride solutions. Experimental work was carried out by using electrochemical impedance spectroscopy method at room temperature to evaluate the impedance of the system. Sodium chloride solutions were prepared with various concentration i.e. 1, 2, 3.5, 4 and 5 w.t. The testing results were represented by Nyquist plot for both alloys. It was observed that the lowest corrosion resistance of both alloys was at 3,5 w.t NaCl which was similar to typical seawater solution. It was also observed that SS 2205 had better corrosion resistance along with greater impedance than the SS 410s in every NaCl concentration.