The lifetime assessment of hot-dip 5% Al–Zn coatings in chloride environments

Shih, Han C.; Hsu, J. W.; Sun, Chengqi; Chung, S. C.

doi:10.1016/s0257-8972(01)01508-0

Cited by 59 publications

(13 citation statements)

References 4 publications

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“…In order to explain this performance, it was assumed that the white rust either continuously dissolved and/or eventually detached from the substrate. 47,48 The time dependence of all these parameters showed in Figs. 7a-7g suggests that although with kinetics defined by the surface topography and chemical composition of each sample, the superficial condition of Z80, UF, and UY samples changed continuously and dynamically from the beginning up to 1000-min immersion.…”

Section: Long Immersion Times: As Seen Inmentioning

confidence: 96%

Morphology and corrosion resistance of Cr(III)-based conversion treatments for electrogalvanized steel

et al. 2009

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The effectiveness of Cr(VI)-based passivation treatments is well accepted but there are many problems with regard to their environmental suitability. Because these compounds are carcinogenic and toxic, eco-friendly systems capable of replacing them are being evaluated. In this work, the corrosion behavior in 0.5 M NaCl solution of zinc coatings deposited from a free-cyanide alkaline bath and treated with Cr 3+ based passivation coatings were characterized through DC and EIS techniques. The salt spray test as well as studies of the surface structure and chemical composition were also performed. From these analyses it was inferred that (1) the greencolored Cr 3+ passivated coatings provide better corrosion resistance than the yellow-and blue-colored coatings, and (2) together with an adequate painting system, they could be a less polluting and less toxic alternative to traditional chromate coatings.

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Section: Long Immersion Times: As Seen Inmentioning

confidence: 96%

Morphology and corrosion resistance of Cr(III)-based conversion treatments for electrogalvanized steel

et al. 2009

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“…Carbon steel (0.19 % C, 0.18 % Si, 0.65 % Mn, all mass %, and balanced with Fe) sheet were cut into 1 χ 13 χ 13 (10" 4 m) 3 and used as substrate for the coatings. Tube samples with the size of φ25 χ 2.5 χ 30 (10" 4 m) 3 were also prepared to imitate the corrosion conditions of heat exchangers.…”

Section: Zn-slurry Diffusing Processesmentioning

confidence: 99%

Zn-Ceramic Composite Coatings oil Carbon Steel

Zlian¹,

He²,

Wang³

et al. 2005

High Temperature Materials and Processes

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Zn-ceramic composite coatings on carbon steel were prepared by a process consisting of two steps. The Zndiffusing coating was produced by a Zn-slurry process, followed by sol-gel deposition of Si0 2 or S1O2/AI2O3 layers. A Zn-Si0 2 or a Zn-Si02/Al 2 0 3 composite coating was formed on carbon steel. The sol-gel solutions used in these experiments were modified by dispersion of Si0 2 and α-Α1 2 0 3 powders. Microstructural studies showed that the top porous surface of Zn-diffusing coating on carbon steel was covered fully with the fine powders of Si0 2 and Si0 2 /Al 2 0 3 . The properties of the composite coatings were improved with the combined advantages of Zn and ceramic coatings. Erosion-corrosion, high-temperature oxidation and sulphidation tests were carried out, indicating that the corrosion resistance of the composite coatings in water and in 3.5 mass % NaCl solution was significantly improved. The composite coatings also showed greatly improved resistance to high-temperature oxidation in air and sulphidation in H 2 S atmosphere at 773K (500°C).

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“…Consequently, the coating acts as a sacrificial anode and degrades preferably while the substrate is protected. In the case of ZnAl coatings, the corrosion products also increase the corrosion resistance as they act as a barrier between the coating and electrolyte [ 1 ].…”

Section: Introductionmentioning

confidence: 99%

“…Galvanization or thermal spraying processes are used to apply ZnAl-based coatings. Disadvantages of galvanization compared to thermal spraying processes are the limitation of the component dimensions to the size of the used electroplating as well as the formation of brittle Fe-Zn intermetallic phases [ 1 ], which are known to reduce the mechanical performance. In comparison, thermal spraying introduces less heat during the process and is less limited in terms of component dimensions [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

Fatigue Assessment of Twin Wire Arc Sprayed and Machine Hammer-Peened ZnAl4 Coatings on S355 JRC+C Substrate

et al. 2022

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Structural elements for applications in maritime environments, especially offshore installations, are subjected to various stresses, such as mechanical loads caused by wind or waves and corrosive attacks, e.g., by seawater, mist and weather. Thermally sprayed ZnAl coatings are often used for maritime applications, mainly due to good corrosion protection properties. Machine hammer peening (MHP) has the potential to increase fatigue and corrosion fatigue resistance of ZnAl coatings by adjusting various material properties such as hardness, porosity and roughness. This study investigates the fatigue behavior of twin wire arc sprayed and MHP post-treated ZnAl4 coatings. Unalloyed steel (S355 JRC+C) was selected as substrate material and tested as a reference. MHP achieved the desired improvements in material properties with increased hardness, decreased roughness and uniform coating thickness. Multiple and constant amplitude tests have been carried out to evaluate the fatigue capability of coating systems. In the high cycle fatigue regime, the additional MHP post-treatment led to an improvement of the lifetime in comparison to pure sandblasted specimens. The surface was identified as a crack initiation point. ZnAl coating and MHP post-treatment are suitable to improve the fatigue behavior in the high cycle fatigue regime compared to uncoated specimens.

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The lifetime assessment of hot-dip 5% Al–Zn coatings in chloride environments

Cited by 59 publications

References 4 publications

Morphology and corrosion resistance of Cr(III)-based conversion treatments for electrogalvanized steel

Morphology and corrosion resistance of Cr(III)-based conversion treatments for electrogalvanized steel

Zn-Ceramic Composite Coatings oil Carbon Steel

Fatigue Assessment of Twin Wire Arc Sprayed and Machine Hammer-Peened ZnAl4 Coatings on S355 JRC+C Substrate

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