Open AccessEffect of pretreatments on electrodeposited epoxy coatings for electronic industries
Author(s) -
S. Palraj,
Muthaiah Selvaraj,
S. Muthukrishnan
Publication year - 2016
Publication title -
aims materials science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.367
H-Index - 16
eISSN - 2372-0484
pISSN - 2372-0468
DOI - 10.3934/matersci.2016.1.214
Subject(s) - materials science , anodizing , epoxy , pickling , dielectric spectroscopy , corrosion , chromate conversion coating , coating , thermogravimetric analysis , cathodic protection , thermal stability , metallurgy , conversion coating , composite material , aluminium , electrochemistry , chemical engineering , electrode , chemistry , engineering
Waterborne epoxy coatings were prepared on aluminium (Al) surfaces by cathodic electro-deposition on the pretreated surface of pickling, phosphating, chromating and anodizing. The electro-deposition experiments were done at two different voltages, 15 V and 25 V at room temperature in 10% epoxy coating formulations. Corrosion and thermal behavior of these coatings were investigated using electrochemical impedance spectroscopy (EIS) and thermo gravimetric analysis (TGA). The coating exhibits better corrosion resistance in anodized Al surface than the other. But, TGA studies show that the thermal stability is higher in anodized and chromated Al surfaces. The surface morphology of these coatings were analyzed by SEM and AFM studies