Corrosion resistance of Gold 21K alloy immersed in artificial sweat in the absence and presence of 100 ppm of urea and also 100 ppm of D-Glucose has been investigated by polarization study and AC impedance spectra. It is observed that Corrosion resistance of Gold 21K alloy immersed in artificial sweat in the presence of 100 ppm of urea / D-Glucose increases. Hence it is concluded that people wearing ornaments made of Gold 21K alloy need not worry about the excess of urea / D-Glucose in their sweat. When Gold 21K alloy is immersed in artificial sweat in the presence of 100 ppm of urea, Linear Polarisation Resistance value increases from 103389Ohmcm2 to 123437Ohmcm2 ; corrosion current decreases from 4.036 x10-7A/cm2 to 3.308 x10-7A/cm2 ; charge transfer resistance value increases from 10490 Ohmcm2 to 14070 Ohmcm2 ; impedance value increases from 4.253 to 4.324; double layer capacitance decreases from 4.862x10-10 F/cm2 to 3.625x10-10 F/cm2 , and phase angle increases from 38.91 to 70.14. When Gold 21K alloy is immersed in artificial sweat in the presence of 100 ppm of D-Glucose, Linear Polarisation Resistance value increases from 103389Ohmcm2 to 4817257Ohmcm2 ; corrosion current decreases from 4.036 x10-7A/cm2 to 0.161x10-7A/cm2 ; charge transfer resistance increases from 10490Ohmcm2 to 33300Ohmcm2 ; impedance value increases from 4.253 to 4.977; double layer capacitance decreases from 4.862x10-10 F/cm2 to 1.5315x10-10 F/cm2 , and phase angle increases from 38.91° to 79.74°.
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°.
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