Abstract
The electrochemical and corrosion behaviour of Zn-20Sn and Zn-0.50Ag alloys in dishwasher detergent solution was investigated by Tafel plot and characterized X-ray diffraction (XRD) and Scanning Electrode Microscope (SEM). The measurements were conducted using different composition of elements addition (Ag: 0.03%, 0.27% and 0.50%. Sn: 1%, 8%, and 15%) under the same experimental conditions. The results showed that the addition of Ag led to decreased corrosion rate compared to Sn addition. The corrosion potential for Zn alloy with Ag addition are shifted towards more noble values compared to Zn alloys with Sn addition . By adding Ag, the current density is decreased and thus reducing the hydrogen evolution rate. The corrosion layer formed on Zinc sample in dishwasher detergent was investigated. The corrosion layer formed on Zn-20Sn-0.5Ag appeared more compact than other alloys. Zinc oxide (ZnO) and Zinc hydroxide (Zn(OH)2) were formed on Zinc alloy surface. Probable mechanisms of Zinc corrosion products formation are presented.
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