The anodic dissolution of nickel—1: Perchlorate and fluoride electrolytes

✍ Scribed by G.T. Burstein; G.A. Wright

• Publisher: Elsevier Science
• Year: 1975
• Tongue: English
• Weight: 394 KB
• Volume: 20
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(75)85049-3

✦ Synopsis

A polcntiostatic sweep technique has been used to study ths anodic dissolution of nickel in acidic perchlorate, acetate and iluorlde solutions. At slow potential sweep rates a prepassive film exists thruughout the anodic region in perchlorate and acetate electrolytes. By [he USC of Cdst sweeps, or by tht: addition of F-. film formation and growth is sufficiently reduced to reveal a linear anodic T&l region. The rate of active &solution. whxh IS independent of LH * ] and LF 1. obeys the following rate law: i = Y~LI,,, exp [flFE/Rfl. with p = 053. The following mechanism is proposed for active dissolution. with the lirst step rate-determming: (I) Ni + H,O-NiOH,,, + H' + L'~. (2) NiOH,,,,--tNiOH' + cm. (3) NiOH+ + H' ti NiL' + H,O. Prepass~vauon is thought to occur from the mtermedlatc NiOH,,, through a solid state mechamsm.