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Abstract
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Corrosion as a natural phenomenon occurs in silence and often subtle. In this chemical
reaction, the metal changes to its more stable stat, such as, oxide, hydroxide or sulfide.
Thus, corrosion may be the biggest cause of deterioration and loss of quality in man-made
structures, the effects of this process and the resulting products causing severe economic
damage, which is usually the case in developed countries for the first time in the country.
At the top of this ranking is about 2 percent of GDP.
In this study, the effect of adding montmorillonite nanoclay to epoxy based paint to
improve the anti-corrosion properties of the paint was investigated. For this purpose, the
delay and reduction of corrosion rate and degradation were experimentally controlled and
measured using epoxy-based paint coating with and without nano-clay on carbon steel
ST12 in sodium chloride salt corrosive medium. The rate of corrosion protection of the
coating was investigated in 3.5% sodium chloride solution. The results show that the epoxy
based coating with 2% nano-clay-montmorillonite K10 shows better efficiency in delay
and reduced corrosion process compared to other coating states. Evaluation of effective
factors such as dye resistance to permeation on 2% nano-modified epoxy based coating
was investigated using electrochemical impedance and tafel polarization techniques. The
amount of adhesion as well as the rate of resistance to rapid deformation were also tested
in 2% nano-modified color sample and the results were quite acceptable. The polarization
curves and the nyquist and bode phase plot were used to obtain the electrochemical
parameters and the results showed that the base epoxy coating formulation containing 2%
nanoclay had the best effect on the protection and delay for ST12 carbon steel surface
corrosion in sodium chloride solution 3.5%.
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