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Corrosion resistance evaluation of Ni‐P\nano‐ZrO 2 composite coatings by electrochemical impedance spectroscopy and machine vision method
Author(s) -
Stankiewicz A.,
Winiarski J.,
Stankiewicz M.,
Szczygieł I.,
Szczygieł B.
Publication year - 2015
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.201407831
Subject(s) - dielectric spectroscopy , corrosion , materials science , composite number , coating , pulmonary surfactant , electrochemistry , nano , composite material , chemical engineering , metallurgy , chemistry , electrode , engineering
Ni‐P\nano‐ZrO 2 composite coatings were obtained on the AISI 304 steel substrate by the electroless method from a bath containing dodecyltrimethylammonium bromide (DTAB). This cationic surfactant prevents ZrO 2 agglomeration in the bath and affects the ZrO 2 content in the coating, hence it alters functional properties of the coatings. It has been found in this study that corrosion resistance of the composite coatings depends on the surfactant concentration in the bath. The estimation of corrosion resistance was carried out by electrochemical impedance spectroscopy. The degree of the sample surface coverage with corrosion products was determined by the machine vision method. The coating obtained from the 0.88 g/dm 3 DTAB solution showed the best protective properties. The machine vision method was shown to be an effective complementary tool to evaluate protective properties of the coatings.