Abstract
This research work presents the results obtained from a comparative corrosion evaluation of welded joints on uncoated steel in flat position, welded joints in flat position on steel protected with polymeric film, and welded joints in flat position on steel covered with nanocomposite polymeric film (primer reinforced with TiO2 nanoparticles). The electrochemical methods of open circuit potential, linear polarization resistance, and electrochemical impedance spectroscopy were used for corrosion evaluation. The results of the electrochemical tests indicate that titanium oxide reinforcing polymeric film to form nanocomposite layers over naval welded steel increases the corrosion protection of polymeric film as compared with unmodified primer.
Highlights
Increasing the lifetime and operational safety in the manufacture of marine structures, ships, or onshore and offshore structures requires the achievement of higher quality structures that exhibit better resistance to the action of different degradation phenomena specific to the marine environment [1].In general, marine and naval structures are made by assembling several steel components
electrochemical impedance spectroscopy (EIS) diagrams presented, it can be concluded that TiO2 nanoparticles have a significant inrole increasing the corrosion resistance of theofepoxy primer, namely in displaying the in increasing the corrosion resistance the epoxy primer, namely in displaying highest corrosion resistance, which highlights the high degree of protection of the the highest corrosion resistance, which highlights the high degree of protection of the nanocomposite nanocompositelayer
Monitoring the free potential in seawater for the four surfaces, i.e., steel without protective coating, a welded joint uncovered, a welded joint covered with polymeric primer, and a welded joint covered with polymeric primer in which dispersed TiO2 nanoparticles, has shown a shift in the free potential to more noble values up to the composite coating
Summary
Increasing the lifetime and operational safety in the manufacture of marine structures, ships, or onshore and offshore structures requires the achievement of higher quality structures that exhibit better resistance to the action of different degradation phenomena specific to the marine environment [1]. Ma et al [7] studied the stress cracking corrosion (SCC) behavior of welded joint E690 in a marine environment using the electrochemical method, and they demonstrated that tensile residual stresses have a negative role as they help to propagate the cracks and contribute to both fatigue failure and stress cracking corrosion. Surface improvement by the incorporation of TiO2 nanoparticles into the polymeric matrix has been reported by several authors: Benea et al [11] demonstrated that the addition of TiO2 nanoparticles into polymeric matrix increases the corrosion resistance of E32 (low alloyed steel); Deyab et al [12] showed that. Repeated mechanical stresses can reduce the corrosion resistance of welded structural materials For these reasons, it is important to improve the corrosion protection coatings to protect the supplement. The results show an enhancement of corrosion resistance for welded
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