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Effect of arsenate anion on the dissolution and passivation of zinc electrode in slightly alkaline solutions

✍ Scribed by I. Sánchez de Pinto; C.P. De Pauli; H. Herrera; H. Mishima; B.A. López

Publisher
Elsevier Science
Year
1986
Tongue
English
Weight
563 KB
Volume
31
Category
Article
ISSN
0013-4686

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✦ Synopsis

Zinc dissolution and passivation in either arsenate or borate and a mixture of arsenate-borate solutions at pH 8.9 was studied by polarization curves and cyclic voltammetry. The arsenate anion produces an increase on zinc dissolution . Potential sweep rate, rotation speed, temperature, dissolved oxygen and anion nature determine the current-potential response in the corrosion region of the metal . Thick films are obtained by repeated potentiostatic steps in a still electrode and by a potentiostatic step in a rotating disc electrode . Repassivation phenomena are observed in the current-time response . EDAX analyses indicate the presence of arsenic and sodium in the film .

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