Development and Characterization of PA 450 and PA 3282 Epoxy Coatings as Anti-Corrosion Materials for Offshore Applications

Abstract

The optimization of two different types of hardeners, namely polyaminoamine adduct (Aradur 450 BD) and polyamidoamine adduct (Aradur 3282 BD), with diglycidyle ether of bisphenol-A (DGEBA) epoxy resin was carried out. Three different stoichiometries of PA 450 to the epoxy resin to fabricate E-0, E-1, and E-2 coating samples and the other three of PA 3282 to the epoxy resin to fabricate F-0, F-1, and F-2 coating samples were coated on mild steel panels. All coated samples were characterized by scanning electron microscopy (FE-SEM), Fourier transform infrared spectroscopy (FTIR), thermo-gravimetric analysis (TGA), and nanoindentation techniques. The electrochemical corrosion behavior of the fabricated coatings was investigated using electrochemical impedance spectroscopy (EIS) after various exposures in the climatic conditions in 3.5% NaCl solutions. It was found that the coatings possess almost identical thermal and mechanical properties. Moreover, the E-1 coating shows better corrosion resistance compared to E-0 and E-2 coatings. On the other hand, the F-1 coating was the most effective in significantly improving corrosion resistance. Overall, the addition of PA 450 and PA 3282 to some stoichiometries improves the corrosion resistance of the fabricated coatings.

Study on fabricating epoxy coatings reinforced with iron oxide flakes and nano silica

“…Epoxy resin YD011X75 in chemical structure has aromatic rings and bonds as −N = N −, −NH 2 , −OH, = CO, −CH 3 , ≡C-O-C≡. Hardener Domide G5022 as polyamide contains groups −OH, −NH 2 , −N = N −, = CO. 47-48 The cured epoxy resins contain many characteristic organic functional groups such as aromatic rings, hydroxyl (-OH) … Absorption peaks at 3433.90, 2939.3, 2853.23, 1609.36, 1510.38, 1462.02, 1297.49, 1248.46, 1183.53, 1038.17, 1012.40, 829.56, and 574.55 cm −1 characterize functional groups of epoxy resins and curing agents. The absorption peaks at 1609.36 cm −1 , 1510.38 cm −1 as well as peaks at 1000–1400 cm −1 are characteristic of aromatic rings.…”

“…The absorption peaks at 1609.36 cm −1 , 1510.38 cm −1 as well as peaks at 1000–1400 cm −1 are characteristic of aromatic rings. 47–48 In addition, vibration bands at 829.56 cm −1 and 729–772 cm −1 are from ring vibrations of the C-H bonds. The peak at 3433.9 cm −1 is mainly due to the elongation of hydroxyl groups (-OH) and may form due to the cured epoxy resin.…”

“…Epoxy resin YD011X75 in chemical structure has aromatic rings and bonds as ÀN = NÀ, ÀNH 2 , ÀOH, = CO, ÀCH 3 , ≡C-O-C≡. Hardener Domide G5022 as polyamide contains groups ÀOH, ÀNH 2 , ÀN = NÀ, = CO. [47][48] The cured epoxy resins contain many characteristic organic functional groups such as aromatic rings, hydroxyl (-OH) … Absorption peaks at 3433.90, 2939. as well as peaks at 1000-1400 cm À1 are characteristic of aromatic rings. [47][48] In addition, vibration bands at 829.56 cm À1 and 729-772 cm À1 are from ring vibrations of the C-H bonds.…”

“…Hardener Domide G5022 as polyamide contains groups ÀOH, ÀNH 2 , ÀN = NÀ, = CO. [47][48] The cured epoxy resins contain many characteristic organic functional groups such as aromatic rings, hydroxyl (-OH) … Absorption peaks at 3433.90, 2939. as well as peaks at 1000-1400 cm À1 are characteristic of aromatic rings. [47][48] In addition, vibration bands at 829.56 cm À1 and 729-772 cm À1 are from ring vibrations of the C-H bonds. The peak at 3433.9 cm À1 is mainly due to the elongation of hydroxyl groups (-OH) and may form due to the cured epoxy resin.…”

Effect of Al2O3 and NiO Nanoparticle Additions on the Structure and Corrosion Behavior of Sn—4% Zn Alloy Coating Carbon Steel

“…EIS measurements have been widely exhibited to report the corrosion and corrosion protection of metals and alloys in various corrosive solutions [42][43][44]. Here, the Nyquist plots were obtained for (1) low-carbon steel (LCS), (2) LCS coated with Sn-4% Zn, (3) LCS coated with Sn-Zn + 0.25 Al 2 O 3 , (4) LCS coated with Sn-Zn + 0.25% NiO, and (5) LCS coated with Sn-4%Zn + 0.25% NiO + 0.25% Al 2 O 3 .…”