Corrosion resistance of SS 18/8 alloy and Gold 22 K alloy in artificial sweat in the presence of D-Glucose

Abstract

Corrosion resistance of SS 18/8 alloy and Gold 22 K alloy immersed in artificial sweat in the absence and presence of 100 ppm of D-Glucose has been investigated by polarization study and AC impedance spectra. It is observed that corrosion resistance of SS 18/8 alloy and also Gold 22 K alloy immersed in artificial sweat in the presence of 100 ppm of D-Glucose decreases. Hence it is concluded that people wearing ornaments made of these two alloys need to worry about the excess of D-Glucose in their sweat. When SS 18/8 alloy is immersed in artificial sweat in the presence of 100 ppm of D-Glucose, Linear Polarisation Resistance value decreases from 589308032 Ohmcm2 to 87905 Ohmcm2 ; corrosion current increases from 8.923x10-11A/cm2 to 4.008x10-9 A/cm2 ; charge transfer resistance value increases from 4884 Ohmcm2 to 3.168 x10-7 12210 Ohmcm2 ; impedance value decreases from 8.023 to 4.008; double layer capacitance increases from 8.9099x10-14F/cm2 to 1.4868 x10-9 F/cm2 , and phase angle decreases from 94° to 54°. When Gold 22 K alloy is immersed in artificial sweat in the presence of 100 ppm of DGlucose, Linear Polarisation Resistance value decreases from 4248438 Ohmcm2 to 236576 Ohmcm2 ; corrosion current increases from 8.038 x10-9A/cm2 to 1.546 x10-7A/cm2 ; charge transfer resistance decreases from 23680 Ohmcm2 to 6336 Ohmcm2 ; impedance value decreases from 4.647to 4.567; double layer capacitance increases from 2.154 x10-10 F/cm2 to 8.049x10-10 F/cm2 , and phase angle increases from 66° to 64°.