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Effects of Na 3 PW 12 O 40 on the corrosion behavior of carbon steel in 55 %LiBr solution
Author(s) -
Liang C.H.,
Hu X.Q.,
Ma L.
Publication year - 2007
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.200603981
Subject(s) - electrochemistry , corrosion , carbon steel , materials science , polarization (electrochemistry) , anode , carbon fibers , nuclear chemistry , cathodic protection , inorganic chemistry , metallurgy , chemistry , electrode , composite material , composite number
Electrochemical technologies, chemical immersion tests and surface detection technologies were adopted to study the inhibition performance of Na 3 PW 12 O 40 inhibitor on carbon steel in 55 % LiBr + 0.07 mol/L LiOH solution, and the inhibition mechanism was discussed. Results indicated that Na 3 PW 12 O 40 inhibitor caused the decrease of both anodic and cathodic polarization current density and a widening of the passive potential region. It behaved as a mixed inhibitor. When the concentration of Na 3 PW 12 O 40 in 55 % LiBr + 0.07 mol/L LiOH solution was 300 mg/L, excellent inhibition performance on carbon steel was obtained. When the solution temperature were 145°C, 160°C, 180°C and 200°C, respectively, the corrosion rates of carbon steel were 13.07 μm/y, 17.74 μm/y, 24.55 μm/y and 73.52 μm/y accordingly. Na 3 PW 12 O 40 inhibitor exhibited an excellent inhibition performance at high temperature. Na 3 PW 12 O 40 is a strong oxidant. Fe was oxidized to Fe 2 O 3 and itself was deoxidized to heteropoly blue. By this mechanism, an integrate compact passive film mainly comprising Fe 2 O 3 may be formed on the carbon steel surface, and the corrosion of carbon steel in 55 % LiBr solution may be retarded by this passive film.