Open AccessBlack Wattle Tannin As Steel Corrosion Inhibitor
Author(s) -
Rafael Silveira Peres,
Eduardo Cassel,
Denise Schermann Azambuja
Publication year - 2012
Publication title -
isrn corrosion
Language(s) - English
Resource type - Journals
ISSN - 2090-8903
DOI - 10.5402/2012/937920
Subject(s) - wattle (construction) , tannin , corrosion , corrosion inhibitor , chemistry , carbon black , dielectric spectroscopy , nuclear chemistry , ferric , aeration , aqueous solution , black liquor , environmentally friendly , electrochemistry , materials science , inorganic chemistry , organic chemistry , composite material , lignin , food science , ecology , natural rubber , electrode , biology
−1 Na2SO4 (pH 6.0 and 2.5). The black wattle tannin when used as a corrosion inhibitor is more effective at acidic pH, its efficiency being dependent on its concentration. At the higher pH value (pH 6.0), a blue-black film (ferric tannate) with a short-term protection against corrosion was formed in aerated aqueous solution. At pH 2.5, this blue-black film was not observed.
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