metals is generally a slow electrochemi cal reaction

Last updated: 7/3/2023

metals is generally a slow electrochemi cal reaction involving many steps These steps in volve electron transfer reactions A particular type of oxidation involve overall first order kinetics with re spect to fraction of unoxidised metal 1 f surface thickness relative to maximum thickness T of oxidised surface when metal surface is exposed to air for con siderable period of time 3 In 1 A Rate law df dt 200 hrs t k 1 f where f of oxide film at time t T thickness of oxide film at t 0 8 A graph of In 1 f vs t is shown in the adjacent figure 41 The time taken for thickness to T X thickness