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APPLIED SURFACE SCIENCE · 2022 · IF 7.392

Synthetic polyaniline-boron nitride-aqueous epoxy resin composite coating for improving the corrosion resistance of hot-dip galvanized steel plates

Yunlong Sang,Qi Liu,Shengxing Wang,Shuhan Dong,Yongzhe Fan,Xue Zhao,Shijie Li

Polyaniline (PANI) was covalently linked with hexagonal boron nitride (BN) using p-aminobenzoic acid (ABA) to obtain a PANI-BN powder. The PANI-BN/EP coating was applied on hot-dip galvanized steel, which exhibited remarkable corrosion resistance. Electrochemical test results showed that the impedance modulus in the low-frequency region of PANI-BN/EP was maximum after soaking in NaCl solution (3.5 wt.%) for 72 h compared with other coatings. The outstanding corrosion resistance of the PANI-BN/EP coating was primarily attributed to the synergistic effect of BN and PANI.

CAS / MDL: 21293-29-8 62-53-3

研究领域: 材料科学 · 防腐蚀工程 · 化学工程

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CORROSION REVIEWS · 2023 ·Vol. 41 ·期 2 ·225-235 · IF 3.2

Properties of sodium molybdate-based compound corrosion inhibitor for hot-dip galvanized steel in marine environment

Zhenkai Xu,Lian Chen,Jingliang Han,Chengfei Zhu

Sodium molybdate (Na 2 MoO 4 ) was selected as the corrosion inhibitor, compounded with benzimidazole, in order to prolong the service life of the hot-dip galvanized steel (HDGS) in the marine environment in this article. XRD, SEM/FESEM and EDS were used to characterize the micro-morphology and elemental composition of HDGS. Immersion corrosion test, Tafel polarization and EIS test were carried out to study the effect of compound inhibitor on the corrosion resistance of HDGS in the marine environment. The best proportion of compound inhibitor was added to the self-made waterborne polyurethane coating (WPUC), aiming to evaluate its influence on the coating performance in the marine environment by immersion corrosion test and EIS test. The results showed that Na 2 MoO 4 , as a passivation type corrosion inhibitor, bounded Zn at the active sites of HDGS coupons and created structural defects. Benzimidazole, as an adsorption type corrosion inhibitor, was attracted by electricity and adsorbed at the structural defects. Under the premise of 1 wt% total content, the optimal ratio of Na 2 MoO 4 & benzimidazole was 9:1 and the corrosion inhibition efficiency was 99.62%. The corrosion current density of HDGS in the simulated seawater with compound inhibitor was 5.650 × 10 −8 A/cm 2 , while that of HDGS in the simulated seawater without compound inhibitor was 1.483 × 10 −5 A/cm 2 . The WPUC containing compound inhibitor had a small decrease in corrosion resistance due to defects created by doping at the beginning of immersion, then the compound inhibitor would play an active role in the corrosion process to make more than double the service life of WPUC.

CAS / MDL: 51-17-2 7631-95-0

研究领域: 材料科学 · 腐蚀与防护 · 化学工程

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Synthetic polyaniline-boron nitride-aqueous epoxy resin composite coating for improving the corrosion resistance of hot-dip galvanized steel plates

Properties of sodium molybdate-based compound corrosion inhibitor for hot-dip galvanized steel in marine environment