Anticorrosion of thermal sprayed Al–Zn–Si coating in simulated marine environments

Yang, Hong-qin; Yao, Zhengjun; Wei, Dongbo; Zhou, Wenbo; Yin, G. X.; Li, Feng

doi:10.1179/1743294414y.0000000315

Cited by 19 publications

(12 citation statements)

References 19 publications

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“…The corrosion current densities of the AH32 and NiCrAlY(Ag) coatings were of the order of 10 −5 A, which was one order higher than that of the NiCrAlY coating, 4.85× 10 −6 A cm −2 . The corrosion resistance of a Ni-based spray coating with a rough surface and porous structure might deteriorate compared to that of Ni-based body materials [35], and that of aluminium is also poor in marine environments [36]. Therefore, the corrosion current of Ni-coated AH32 decreased by only one order of magnitude.…”

Section: Corrosion Resistancementioning

confidence: 99%

Biological fouling and corrosion resistance of Ni-based coating on AH32

Zhiwei,

Yanwen,

Caibo

et al. 2023

Surface Engineering

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To reduce the destruction of organic biological fouling in marine steel, nickel-based (NiCrAlY) transition coatings with and without silver (Ag) doping were prepared on AH32 marine steel by plasma spraying. The coatings exhibited a layered structure, and AlNi 3 ( 111), ( 200), and (220) diffraction peaks were detected. The Ag (111) peaks were also observed for the Ag-doped coatings. The number of sulphate-reducing bacteria (SRB) adsorbed on the coating surfaces reduced after immersion in the bacterial solution, and their shells were disintegrated because of the presence of Ag. The corrosion potentials of AH32, NiCrAlY, and NiCrAlY(Ag) coated AH32 plates were nearly identical at approximately −720 mV. After being covered with organic paint, the corrosion potential and current density of the NiCrAlY(Ag) coating increased to −624 mV and decreased by one order of 2.75 × 10 −6 A cm −2 , respectively. The NiCrAlY(Ag) coating effectively inhibited biological fouling.

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Section: Corrosion Resistancementioning

confidence: 99%

Biological fouling and corrosion resistance of Ni-based coating on AH32

Zhiwei,

Yanwen,

Caibo

et al. 2023

Surface Engineering

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“…Yang et al used alloy wire thermal spraying technology to prepare AlZnSi coating with lamellar structure on the surface of Q235 steel plate. In seawater corrosion experiments, it was found that the corrosion products were mainly zinc-aluminum-carbonate-sodium hydroxide hydrate, which blocked the pores and caused self-sealing behavior, hindering further corrosion [9]. In addition, Mosayebi et al prepared Ni-Mo coatings by electroplating.…”

Section: Introductionmentioning

confidence: 99%

Effect of Different Contents of WC on Microstructure and Properties of NiCrMo Coatings Prepared by PTA

et al. 2022

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During the service process of the mechanized fishing boat, its low carbon steel hull and parts are extremely susceptible to Cl− erosion and seawater scouring, which cause a decrease in strength and lead to failure. To increase its service life and reduce maintenance costs, coating protection technology is widely used. In order to solve the problem of poor adhesion between paint coating and substrate and low strength of metal coating, NiCrMo-WC coatings with different WC contents (0 wt.%, 5 wt.%, 10 wt.%, 15 wt.%, 20 wt.%) were prepared on the surface of Q235 substrate by plasma cladding technology. The coatings were characterized by X-ray diffractometer (XRD), scanning electron microscope (SEM), energy spectrum analysis (EDS), etc. Its phase formation rule, microstructure and element distribution were studied. Microhardness test and electrochemical corrosion test were carried out. The study found that the 20 WC coating has the highest average hardness (563.1 HV). It is about 3.25 times of the Q235 substrate. It has the lowest friction, wear rate and lower friction coefficient, showing the best wear resistance. The 15 WC coating has the lowest self-corrosion current density (3.4934 × 10−7 A/cm2) and the lowest corrosion rate (0.0041 mm/a), which is only 3.7% of the corrosion rate of Q235 steel.

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“…Thermal spray technologies, such as high-velocity oxygen-fuel (HVOF) spray [15,16], flame spraying [17,18] and arc spray [7,19,20] are the most common techniques to prepare Zn and Al coatings. However, due to the high process temperature of these techniques, the thermal-sprayed coatings inevitably have problems such as oxidation, phase transition, porosity and residual thermal stresses.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Corrosion Behavior of Cold-Sprayed Zn-Al Composite Coating

et al. 2020

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A Zn–Al composite coating was successfully deposited on Q235 steel by cold spray technology for the corrosion protection in the marine atmosphere. The microstructure and corrosion behavior of the prepared coating was studied byScanning Electron Microscope (SEM), X-ray Diffraction (XRD), salt spray test and electrochemical experiments. A 2400-h neutral salt spray corrosion test (with a corrosion medium of 3.5% sodium chloride solution) showed that the prepared cold-sprayed Zn-Al composite coating has excellent anti-corrosion properties. Based on the microstructure evolution and corrosion products analysis, droplets’ flow-driven ‘synergistic corrosion effect’ was proposed to explain the co-corrosion behavior of Zn and Al particles in the composite coating.

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Anticorrosion of thermal sprayed Al–Zn–Si coating in simulated marine environments

Cited by 19 publications

References 19 publications

Biological fouling and corrosion resistance of Ni-based coating on AH32

Biological fouling and corrosion resistance of Ni-based coating on AH32

Effect of Different Contents of WC on Microstructure and Properties of NiCrMo Coatings Prepared by PTA

Microstructure and Corrosion Behavior of Cold-Sprayed Zn-Al Composite Coating

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