Premium
Influences of Temperature and pH Value on the Corrosion Behaviors of X80 Pipeline Steel in Carbonate/Bicarbonate Buffer Solution
Author(s) -
LI JinBo,
ZUO JianE
Publication year - 2008
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.200890324
Subject(s) - corrosion , chemistry , bicarbonate , dielectric spectroscopy , buffer solution , carbonate , electrochemistry , inorganic chemistry , cyclic voltammetry , metallurgy , chemical engineering , materials science , electrode , chromatography , organic chemistry , engineering
Abstract The joint effect of temperature and pH value on the corrosion behavior of X80 steel in carbonate/bicarbonate buffer solution was detected by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and Mott‐Schottky analysis. The results show that an unstable corrosion film will be formed on the X80 steel surface in low pH value solutions, and a better protective corrosion film can be formed on the X80 steel surface in high pH value solutions. On the whole, the corrosion film resistance and transfer resistance increase with the increment of pH value, and decrease with increase of solution temperature, which indicates that the protective effect of the corrosion film on X80 steel is enhanced with increasing pH value and decreasing the solution temperature. The corrosion film formed on X80 steel surface in carbonate/bicarbonate buffer solution has an n‐type semi‐conductive character, and the donor density decreases with increasing the pH value, and increases with increasing the solution temperature. The flat‐band potential and pH value have a linear relationship with a positive slope.