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Citation: Qiu Deyu, Yin Chengbin. THE PASSIVATION OF AI IN KOH SOLUTION[J]. Chinese Journal of Applied Chemistry, ;1986, 3(5): 54-57. shu

THE PASSIVATION OF AI IN KOH SOLUTION

Qiu Deyu ,
Yin Chengbin

1.
Changchun Institute of Applied Chemistry, Academia Sinica

Received Date: 1 August 1985
Available Online: 30 October 1985

The influence of the concentration of KOH and Al(OH)₄^- and current density on the passivation of Al has been investigated using galvanostatic charging method. It was shown that the relation between i and τ^=1/2 obeys the well known non-steady state diffusion equation (i-i_L)τ^=1/2=(1/2)nF(C_Al^S -C_Al⁰)(D_(Al)π)^1/2=k (1) The i~τ^-1/2 curve was composed of two straight lines with different slops and C_Al^S, D_Al have been calculated from the results based on equation(1). The results indicate that when current density is low the passivation of Al electrode is controlled by the diffusion of Al(OH)₄^- ions from the surface into the solution and an anodic passivation film is formed as a result of the precipitation of Al(OH)₃ or Al₂O₃ from the super-saturated Al(OH)₄^- solution near the electrode surface. At higher current densities, the formation of the anodic passivation film is caused by both electrochemical reaction and the diffussion-controlled precipitation.
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