Atmospheric Corrosion and Tarnishing of Pd-Ag Alloy (Using Taguchi Design of Experiment)

This paper describe a study on atmospheric corrosion of special Pd-Ag alloy (Ag- 5%Pd- 2.5%Cu) in four gaseous environments contain air and CO2,SO2,H2S and NO2 in two temperature 25˚Cand 50˚C and four relative humidity (40%,60%,80% and 100%). Design of experiment was performed with Minitab15 software using taguchi method L16. The product composition was investigated with XRD low angle (grazing) and factsage software also used for simulating the reaction condition. Gloss meter tests were performed to samples to find the tarnish effect of the gasses. It was found that SO2 had the most and CO2 had the least corrosive effect on samples. With increasing in time and temperature corrosion was increased. And finally the most tarnishing gas was H2S and the least effect was from CO2.