TY - JOUR
T1 - Evaluation of synergistic effect of nanozinc/nanoclay additives on the corrosion performance of zinc-rich polyurethane nanocomposite coatings using electrochemical properties and salt spray testing
AU - Arianpouya, N.
AU - Shishesaz, M.
AU - Arianpouya, M.
AU - Nematollahi, M.
PY - 2013/2/15
Y1 - 2013/2/15
N2 - This research work focuses on the synthesis, characterization and processing of polyurethane/zinc/clay nanocomposites to improve the corrosion performance of zinc-rich coatings. Therefore different percentages of montmorillonite clay nanolayers were added to zinc-rich polyurethane nanocomposites. Ultrasonication process was used to prepare polyurethane/nanozinc/nanoclay composites. Then coatings were applied on steel panels with composition of 10wt.% nanozinc and 0.5wt.%, 1wt.%, 1.5wt.%, and 2wt.% nanoclay. TEM was used to analyze the structural characteristics of the samples. The results of the structure analysis revealed the size of nanomaterials. The anticorrosive properties of the nanocomposites were investigated using DC polarization technique, electrochemical impedance spectroscopy (EIS), water absorption and salt spray test. The results of electrochemical tests showed that addition of clay nanolayers improves the corrosion resistance of coatings and the best corrosion performance obtained for the nanocomposite sample with 2wt.% nanoclay. Also, according to the results of the salt spray test, the sample with 2wt.% nanoclay showed the least H2O penetration and exfoliation adjacent to the scratches.
AB - This research work focuses on the synthesis, characterization and processing of polyurethane/zinc/clay nanocomposites to improve the corrosion performance of zinc-rich coatings. Therefore different percentages of montmorillonite clay nanolayers were added to zinc-rich polyurethane nanocomposites. Ultrasonication process was used to prepare polyurethane/nanozinc/nanoclay composites. Then coatings were applied on steel panels with composition of 10wt.% nanozinc and 0.5wt.%, 1wt.%, 1.5wt.%, and 2wt.% nanoclay. TEM was used to analyze the structural characteristics of the samples. The results of the structure analysis revealed the size of nanomaterials. The anticorrosive properties of the nanocomposites were investigated using DC polarization technique, electrochemical impedance spectroscopy (EIS), water absorption and salt spray test. The results of electrochemical tests showed that addition of clay nanolayers improves the corrosion resistance of coatings and the best corrosion performance obtained for the nanocomposite sample with 2wt.% nanoclay. Also, according to the results of the salt spray test, the sample with 2wt.% nanoclay showed the least H2O penetration and exfoliation adjacent to the scratches.
KW - Clay
KW - EIS
KW - Nanocomposite coating
KW - Zinc-rich coating
UR - http://www.scopus.com/inward/record.url?scp=84872974373&partnerID=8YFLogxK
U2 - 10.1016/j.surfcoat.2012.11.036
DO - 10.1016/j.surfcoat.2012.11.036
M3 - Article
AN - SCOPUS:84872974373
SN - 0257-8972
VL - 216
SP - 199
EP - 206
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
ER -