Fabrication of environmentally friendly anti-corrosive composite coatings on AZ31B Mg alloy by plasma electrolytic oxidation and phytic acid/3-aminopropyltrimethoxysilane post treatment

Coordination driven layer‐by‐layer deposition technology used for fabrication of flame retardant polyamide 66 fabric

“…This may be ascribed to the presence of POH groups after incorporation of IP 6 onto PA fabric. A wide absorption peak at 1158 cm −1 could be assigned to PO groups from IP 6 molecules on the surface of IP 6 ‐PA fabric, 10,21 while no obvious absorption peak could be detected around 1000 cm −1, 22 indicating the absence of condensation reaction between POH groups from IP 6 due to low concentration IP 6 and low temperature cure step in the finishing. When the PA fabric is treated by Al 3+ and IP 6 alternatively for 20LBL deposition, twin peaks at 850 and 806 cm −1 could be observed obviously in spectrum d, which correspond to the characteristic peaks of complex salt synthesized by the coordination reaction of IP 6 with trivalent metal ion, such as Al 3+ and Fe 3+ 23 .…”

Hybrid Organic-Inorganic Materials on Metallic Surfaces: Fabrication and Electrochemical Performance

“…In attempt to improve the anticorrosion performance of coatings on Mg alloy, Pak et al [14] employed a combination of PE and DCC, that consisted of MgO and two chemical compounds, namely phytic acid (PA) and 3-aminopropyltrimethoxysilane (APTMS). Phytic acid is widely known to easily form a protective film on the surface of metals due to its capability of producing chelate compound with metal ions, while APTMS tends to form silane covalent bond [14]. By synergistic combination of PA and APTMS, the value of corrosion parameter, i.e i corr of Mg alloy decreased from 7.81 × 10 −5 A cm −2 to 3.90 × 10 −7 A cm −2 for MgO and 8.37 × 10 −8 A cm −2 for MgO/PA-APTMS.…”

“…Further investigation was made to study the corrosion behavior of MgO/PA-APTMS hybrid coatings which exhibited superior anti-corrosion performance to that Mg alloy in which the impedance value of Mg alloy, MgO, and MgO/PA-APTMS are 6.90 × 10 2 Ω cm 2 , 9.70 × 10 4 Ω cm 2 and 5.02 × 10 5 Ω cm 2 , respectively. In particular, the circular pores generated by PE were sealed by the nanoscale structure of PA-APTMS during DCC [14]. Consequently, network structure of P-O-Si bonds interacted with MgO via Mg-O-P bond, which provides highly stable covalent bonds.…”

“…In addition to the previous works, a self-assembly of flower-like structures which resulted from the growth of 8-hydroxyquinoline-5-sulfonic acid (HQS) on porous IL was triggered by the interaction of conjugated double bonds within the aromatic rings and heteroatoms with IL. Al Zoubi et al [14] fabricated a HOI material comprising IL-metal-HQS (metal: Na and Co) which contributed to the improvement of the electrochemical performance and chemical stability owing to both intermolecular locking of H atoms and interaction of π-π bond within heterocyclic molecules with porous IL. The icorr values of IL-Na-HQS and IL-Co-HQS were measured to be 8 × 10 −8 A cm −2 and 6 × 10 −9 A cm −2 , respectively, which were three and four orders of magnitude lower than that of bare Mg alloy as shown in Figure 6a.…”

“…To this end, they immersed IL grown on AM50 alloy into a solution containing tetraethylorthosilicate (TEOS) and methyltriethoxysilane (MTES) which caused a decrease in the IL defective surface, leading to an outstanding electrochemical performance. Using a similar method, other sealing agents, such as dimethyl-5hydroyisophthalate (DMIP) [10], 8-hydroxyquinoline (also known as 1-azanaphthalene-8ol,) [11,12], and 4- [4-(phyenylazo)phenylazo]-o-cresol (PPC) [13] have been also applied as corrosion inhibitors combined with the inorganic porous materials in a bid to improve their structural integrity, thereby enhancing the corrosion resistance, especially during Metals 2021, 11, 1043 2 of 12 long-term exposure [14]. Therefore, the combination of organic and inorganic components may suggest the facile formation of HOI materials with different architecture manipulating their electrochemical performance.…”