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Tafel constants and changes in hydrogen coverage during corrosion of Fe18Cr.

Authors
Rosen-M; Harris-JG
Source
J Electrochem Soc 1983 Dec; 130(12):2329-2334
NIOSHTIC No.
10003473
Abstract
Cathodic tafel constants associated with the hydrogen reaction at fe18cr in h2-saturated 1nh2so4 were determined by computer analysis of the potential decay following current interruption at fixed starting potentials positive to the corrosion potential. The values of b = -2.3 Rt/af were evaluated from the general current- interruptive equation, e = e1 + b.Log [1 + t/n], from its linear log form, and from a modification of the general equation that was derived to analyze multiple tafel regions. For starting potentials of 0, -0.05, -0.075, and -0.2V (rhe), the number of tafel regions was 3, 3, 2, and 1, respectively. The amount of hydrogen associated with the electrode at the fixed potentials and during decay was determined from anodic charging pulses. Results indicated that the bonding strength betwen metal sites and hydrogen varies with decay and starting potential. The first tafel region from 0, -0.05, and - 0.075V was under combination control, 2h->h2. The decay from -0.2V was controlled by the electrochemical-desorption step, h+ + e + h- >h2.
Keywords
Mining-industry; Mineral-processing; Metals; Author Keywords: corrosion; iron alloys; chromium alloys; electric potential; electric current; cathode; discharge; potential; adsorption
CODEN
JESOAN
Publication Date
19831201
Document Type
OP; Journal Article
Fiscal Year
1984
NTIS Accession No.
NTIS Price
Identifying No.
OP 30-84
Issue of Publication
12
ISSN
0013-4651
NIOSH Division
AVRC
Source Name
Journal of the Electrochemical Society
State
MD
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