Corrosion Study of A516 Grade 70 Steel in Sodium Aluminate Solution of Bayer Process Containing Sulfide and Determination of Sulfide by a Practical Method
Subject Areas : Applied ChemistryMohammad Reza Ramazani 1 , Mohammad Hadi Givianrad 2 * , Mohamad Saber Tehrani 3 * , Parviz Abroomand Azar 4
1 - گروه شیمی، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران
2 - گروه شیمی، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران
3 - Department of chemistry, Science and Research Branch, Islamic Azad University, Tehran, Iran
4 - گروه شیمی، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران
Keywords: Corrosion, A516 steel, Sulfide, Aluminate solution, Bayer process,
Abstract :
Sulfide ions in the Bayer process solution can accelerate the corrosion of steel equipment. In the present research, after determining the concentration of sulfide ions in sodium aluminate solution of Bayer process by a developed method and investigating the source of sulfide in the aluminate solution, the corrosion rate of A516 grade70 steel pieces in the presence of S2- ion was investigated. For this purpose, the corrosion of pieces of A516 grade70 steel in dimensions (5x15x25 mm) in concentrations of 0.2 to 0.6 g/L of sulfide ions was investigated for 5 days inside the autoclave under conditions similar to the Bayer process. The corrosion rate was calculated using the method of measuring the weight loss of steel samples. In addition, the corrosion rate of steel pieces in the pure sulfide solution and in the aluminate solution whose sulfide was neutralized by nitrate was investigated and compared. The results demonstrated that steel corrosion rate in the presence of pure sulfide is very insignificant. However, steel corrosion rate in aluminate solution containing sulfide, even with small quantities, is significant.
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