Abstract:
The UNS S41003 is a low-cost stainless steel with good mechanical properties. This steel can replace carbon steel in a moderate corrosive environment with the aim at increasing the total life cycle of several types of equipment. The objective of this work is to determine the thermodynamic stability, through open circuit potential measurements, of the UNS S41003, UNS S30400 and SAE 1010 steels in a diluted sodium sulfate solution. The open circuit potential was measured in an agitated diluted sodium sulfate solution, with and without 100 ppm of chlorides, decreasing the pH from 9.0 down to the pH at which the UNS S41003 passive layer breakdown occurs. The results have shown that the UNS S41003 and the UNS S30400 passive layer breakdown, in chloride free solutions, occurs below the pH 3.2. The SAE 1010 steel open circuit potential continuously decreases with pH reduction but, at pH 4.5, there is a steeper drop. In the chloride containing solution, the UNS S41003 and UNS S30400 steel passive layer breakdown occurs below the pH 6.0. The SAE 1010 steel has the same behavior as the chloride free solution but its open circuit potential presents a steeper drop at pH 4.0.
Reference:
VIANA, Adolfo K.N.; PANOSSIAN, Zehbour; OLIVEIRA, Tarcisio R. de; SANTOS, Celia Aparecida Lira dos. Comparative thermodynamic stability of the stainless UNS S41003, UNS S30400, and carbono steel SAE 101’0 in diluted sodium sulface solution. In: INTERNATIONAL CORROSION CONGRESS, 21., AND THE INTERNATIONAL CORROSION MEETING, 8., 2021, São Paulo. (on-line). Proceedings… 4 p.
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The UNS S41003 is a low-cost stainless steel with good mechanical properties. This steel can replace carbon steel in a moderate corrosive environment with the aim at increasing the total life cycle of several types of equipment. The objective of this work is to determine the thermodynamic stability, through open circuit potential measurements, of the UNS S41003, UNS S30400 and SAE 1010 steels in a diluted sodium sulfate solution. The open circuit potential was measured in an agitated diluted sodium sulfate solution, with and without 100 ppm of chlorides, decreasing the pH from 9.0 down to the pH at which the UNS S41003 passive layer breakdown occurs. The results have shown that the UNS S41003 and the UNS S30400 passive layer breakdown, in chloride free solutions, occurs below the pH 3.2. The SAE 1010 steel open circuit potential continuously decreases with pH reduction but, at pH 4.5, there is a steeper drop. In the chloride containing solution, the UNS S41003 and UNS S30400 steel passive layer breakdown occurs below the pH 6.0. The SAE 1010 steel has the same behavior as the chloride free solution but its open circuit potential presents a steeper drop at pH 4.0.
Reference:
VIANA, Adolfo K.N.; PANOSSIAN, Zehbour; OLIVEIRA, Tarcisio R. de; SANTOS, Celia Aparecida Lira dos. Comparative thermodynamic stability of the stainless UNS S41003, UNS S30400, and carbono steel SAE 101’0 in diluted sodium sulface solution. In: INTERNATIONAL CORROSION CONGRESS, 21., AND THE INTERNATIONAL CORROSION MEETING, 8., 2021, São Paulo. (on-line). Proceedings… 4 p.
Document with restricted access. Login to BiblioInfo, Library/IPT-DAIT to access PDF text:
https://escriba.ipt.br/pdf_restrito/177432.pdf
