Electrochemical evaluation of corrosion resistance of NiCrBSi coatings deposited by HVOF

Wei-min, Zhao; Wang, Yong; Han, Tao; Wu, Kaiyuan; Xue, Jie

doi:10.1016/j.surfcoat.2003.09.053

Cited by 53 publications

(23 citation statements)

References 18 publications

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“…[13,14] The porosity of both Ni-20Cr and Ni-50Cr cold-spray coatings was found to be less than 1.6 pct. The results are consistent with the findings of Sampath et al, [22] who have reported the porosity of cold-spray coatings to be less than 2 pct.…”

Section: Discussionmentioning

confidence: 94%

“…Dense coatings usually provide better corrosion resistance than porous coatings, as the porosity can harm the persistent corrosion resistance of the coating. [13,14] The porosity measurements were made for the as-sprayed coatings. The porosity for the as-sprayed coatings was found to be in the range of 1.5 to 1.6 pct for both the Ni-20Cr and Ni-50Cr coatings, irrespective of the substrate steel.…”

Section: B Porositymentioning

confidence: 99%

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Characterization and High-Temperature Oxidation Behavior of Cold-Sprayed Ni-20Cr and Ni-50Cr Coatings on Boiler Steels

Bala

Singh

Prakash

2011

Metall Mater Trans A

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Microstructure and mechanical properties of cold-spray coatings are usually required in order to explore the potential industrial application of the latter. This article demonstrates the successful formulation of Ni-20Cr and Ni-50Cr coatings on two boiler steels, namely, SAE 213-T22 and SA 516 steel by cold-spray process. The microstructure, coating thickness, phase formation, and microhardness properties of the coatings were evaluated. The coatings were subjected to cyclic heating and cooling cycles at an elevated temperature of 1173.15 K (900°C) to ascertain their high-temperature oxidation behavior. Moreover, these cyclic exposures can give useful information regarding the adhesion of the coatings with the substrate steels. Of all the coatings, the Ni-50Cr coating on SA 516 steel had a maximum average hardness value of 469 Hv. As observed from the surface field emission-scanning electron microscopy (FE-SEM) analysis, the coatings were found to have nearly dense microstructure with the sprayed particles in interlocked positions. It was concluded that the cold-spray process is suitable for spraying the preceding powders onto the given boiler steels to produce nearly dense and low oxide coatings. The coatings, in general, were found to follow the parabolic rate of oxidation and were successful in maintaining their surface contact with their respective substrate steels.

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Section: Discussionmentioning

confidence: 94%

Section: B Porositymentioning

confidence: 99%

Characterization and High-Temperature Oxidation Behavior of Cold-Sprayed Ni-20Cr and Ni-50Cr Coatings on Boiler Steels

Bala

Singh

Prakash

2011

Metall Mater Trans A

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“…It is well known that porosity of the coatings affects the corrosion resistance of thermal spray coatings. Dense coatings usually provide a better corrosion resistance than the porous coatings as porosities can do harm to the persistent corrosion resistance of the coating [12,13]. The porosity of the NiCrAl coatings has been found to be less than 1.70%.…”

Section: Discussionmentioning

confidence: 99%

Microstructural characteristics and mechanical properties of HVOF sprayed NiCrAl coating on superalloys

Mahesh

Jayaganthan

Prakash

2009

Journal of Alloys and Compounds

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“…As the potential measured at each time was not locally measured, it only represents an average potential value of all contributions of the sample in contact with the electrolyte, and can be provided the information on the evolution and degrading of the coating [20,21]. Figure 7 shows the opencircuit potential (E corr ) measurements of the HVOF coatings Fig.…”

Section: Electrochemical Performance Of the Coatingsmentioning

confidence: 99%

Improvement on HVOF sprayed Diamalloy coatings by laser irradiation

Zhang

2012

Appl. Phys. A

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We investigated the structure change, surface properties (roughness, porosity, and hardness), tribological, and electrochemical performances of HVOF sprayed Ni20Cr-10W-9Mo-4Cu-1C-1B-1Fe (Diamalloy-4006) coatings before and after laser irradiation. The results showed that the friction and wear resistance of the coatings were improved significantly with an optimized laser irradiation process. The improvement can be attributed to the improved roughness and hardness, as well as the formation of oxides Cu x O and Cr 2 O 3 tribofilms. With the laser irradiation treatment, the local corrosion of the coating had a decrease and the selective corrosion resistance of the Diamalloy-4006 coating was improved as a result of the decreasing the size and number of the pores, especially compact interface achieved by laser irradiation.

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Electrochemical evaluation of corrosion resistance of NiCrBSi coatings deposited by HVOF

Cited by 53 publications

References 18 publications

Characterization and High-Temperature Oxidation Behavior of Cold-Sprayed Ni-20Cr and Ni-50Cr Coatings on Boiler Steels

Characterization and High-Temperature Oxidation Behavior of Cold-Sprayed Ni-20Cr and Ni-50Cr Coatings on Boiler Steels

Microstructural characteristics and mechanical properties of HVOF sprayed NiCrAl coating on superalloys

Improvement on HVOF sprayed Diamalloy coatings by laser irradiation

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