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The methodology of Corrosion inhibitor development for CO 2 systems
Author(s) -
Hausler R. R.,
Stegmann D. W.,
Stevens R. F.
Publication year - 1989
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.19890400206
Subject(s) - corrosion , rank (graph theory) , corrosion inhibitor , metal , kinetics , degree (music) , chemistry , materials science , metallurgy , biological system , mathematics , physics , biology , combinatorics , quantum mechanics , acoustics
Three fundamental criteria are defined by means of which test data are being judged relative to their information content. They must be UNIQUE, RELEVANT, and PREDICTIVE. The degree to which these criteria are met depends on the mechanistic understanding of the underlying corrosion or inhibition processes. It will be shown that of all the routine tests the Wheel Test procedure is the worst in that it does not meet is main objectives and cannot rank different inhibitors predictively. Comparative tests to establish the corrosion kinetics and performance/concentration curves for inhibitors were run in highly agitated kettles and small autoclaves. Corrosion rates were determined by iron analyses and weightloss determinations. The problem of the constantly changing pH in solution was eliminated by pH‐stating. The inhibitor performance in some cases is strongly dependent on pH and CO 2 partial pressure. All evaluations were done on AISI‐1020 or AISI‐1018 metal.