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Effect of phosphine on acid corrosion of iron
Author(s) -
Bala Henryk
Publication year - 1986
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.19860371207
Subject(s) - corrosion , phosphine , chemistry , cathodic protection , inorganic chemistry , alloy , ion , anaerobic corrosion , hydrogen , electrode , electrochemistry , catalysis , organic chemistry
The effect of the phosphine‐concentration (10 −8 –10 −3 M) in strong acid solutions (pH = 0) on the corrosion rate of pure iron and Fe‐ 0.12% P alloy has been investigated. It was shown that at low concentrations (10 −7 –10 −6 M), phosphine accelerates the corrosion of iron, whereas at adequately high concentrations (10 −5 –10 −3 M) it has inhibitory properties. In the presence of PH 3 the cathodic reduction of hydrogen ions is strongly accelerated. At the same time, the increase in PH 3 concentration causes an increase of surface coverage by PH 3 molecules, which results in the inhibition of both partial electrode processes.