engleski

Investigation of corrosion behavior of AISI 316L in NaCl solution

The corrosion behavior of AISI 316L stainless steel in 0.5 mol dm-3 NaCl solution was investigated in a quiescent solution, with an electrode rotation rate of 400 rpm, and at electrolyte temperatures 20, 40 and 60 ºC. The investigations included open circuit potential measurements, linear polarization measurements and potentiodynamic polarization measurements. The corroded electrode surface was investigated under an optical microscope after the potentiodynamic polarization measurements. The investigations results have shown that an increase in electrolyte temperature leads to an increase in the corrosion current densities and to a decrease the values of polarization resistance, which meant higher corrosion of steel. The electrode rotation also increases the values of corrosion current density and decreases the values of polarization resistance. The microscopic investigations have shown that the dominant corrosion attack is pitting corrosion. The increase in electrolyte temperature leads to the increase the number of corrosion pits on the electrode surface.

stainless steel ; corrosion ; potentiodynamic polarization

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