Film Thickening on Nickel in Aqueous Solution in Relation to Anion Type and Concentration

摘要: AbstractThe variation of the open circutt potential Ni electrode in strongly aerated soluiion different concentrations Cl−, Br−, I−, NO−3, SO2−4 and CrO2−4 is followdd till steady-stete values are established. In all solutions steady potentials, Esb, approached from negative values, denoting film repair thickening. Except relatively concentrated Cl− media, no Ni2+ detected solution. Plots potential, E, as a function logarithm immersion time, t, linear, satisfying general relationship:E = al + b1log t ……(1)where a1 b1 constants. Equation (1) derived theoretically by taking into account p-conducting properties NiO, assuming that adsorption anions on oxide generates electric field necessary to promoee diffusion through oxide. The rates thickening presenee various computed discussed. Expressions deduced relat...