Improvement of solar absorbing property of Ni–Mo based thermal spray coatings by laser surface treatment

Gao, Ya; Xiong, Jiangtao; Gong, Dianqing; Li, Jinglong; Ding, Ming

doi:10.1016/j.vacuum.2015.07.018

Cited by 18 publications

(14 citation statements)

References 23 publications

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“…To address these problems, many efforts have been made to produce high-performance Co-based coatings providing improved corrosion resistance to a component [4]. However, the drawbacks of Co in terms of cost and environmental restriction have increased the interest to find other materials [5][6][7][8][9]. High-alloyed Fe-based coatings containing a sufficient level of another major alloying element such as Cr or Ni would be a cheaper and a more environmentally friendly alternative to Co-based coatings of specific interest in high demanding applications [5,[10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study of Corrosion Resistance for HVAF-Sprayed Fe- and Co-Based Coatings

2016

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There is an increasing demand to replace Co-based coatings with cheap and environmentally friendly Fe-based coatings in corrosive environments. The main objective of this work was to evaluate whether Fe-based coatings could present a better corrosion performance than Co-based coatings. Therefore, two types of Fe-based and one type of Co-based coatings with chemical compositions (in wt %) of Fe-28Cr-16Ni-1.85C (FeNiCrC), Fe-17Cr-12Ni (FeNiCr), and Co-28Cr-1C (CoCrC) were produced by High Velocity Air Fuel (HVAF) spraying. The corrosion behavior of the coatings was studied comparatively by electrochemical tests in 3.5 wt % NaCl solution at 25˝C. The polarization test results showed that the FeCrNiC coating protected the underlying substrate better than the CoCrC coating, while the FeCrNi coating failed to hinder the penetration of corrosive ions. Electrochemical impedance spectroscopy (EIS) measurements revealed that the solution penetrated into the coating through defects, however the corrosion process slowed down due to clogging of the interconnected defects by corrosion products. Increasing the in-flight average particle temperature from 1400˝C to 1500˝C led to a denser coating with fewer defects which seemed to improve the corrosion resistance of the FeCrNiC coating. The high-alloyed Fe-based coatings had the best corrosion protection performance and can thus be recommended as a potential alternative to Co-based coatings.

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Section: Introductionmentioning

confidence: 99%

A Comparative Study of Corrosion Resistance for HVAF-Sprayed Fe- and Co-Based Coatings

2016

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“…It is worth pointing out that microstructural changes resulting from laser heat treatment of nickel-based thermalsprayed coatings are recently also effective in improving technologies for generating renewable energy. In 2015, Gao et al published a paper which focused on enhancing solar absorbing property of Ni-Mo based coatings by laser surface treatment [20]. Two types of coatings (70%Ni-30%Mo and 66%Ni-28.5%Mo-5%Co) were sprayed onto the AISI 307L substrate with HVOF method and laser processed using Nd:YAG pulsed laser.…”

Section: Fig 4 Microhardness Of Ni-p and Ni-p-sic Coatings Before Amentioning

confidence: 99%

“…In the 21th century thermal sprayed coatings were laser heat treated to better understand formation of new phases and for improving their wear resistance and microhardness [18,19]. Moreover, in recent years studies on increasing solar absorption by laser heat treatment in nickelbased materials for green technologies were also published [20].…”

Section: Introductionmentioning

confidence: 99%

Laser heat treatment of nickel-based alloys – a review

Kukliński

Szymański

Przestacki

2019

Archives of Mechanical Technology and Materials

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In this paper researches which focus on laser heat treatment of nickel-based alloys are reviewed. Studies published from 1970s until today are taken into consideration. Publications which focus on influence of laser thermal processing on surface layer condition both on solid materials and pre-deposited coatings are described. Laser technologies in which additional materials are delivered during the process are not considered. In order to focus on studies investigating microstructural changes resulting mainly from material remelting, laser shock processing is also disregarded.

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“…The interface between the as-sprayed coating and the substrate was mechanically bonded, while the interfacial bonding has been reported to become stronger metallurgically after the laser treatment [8]. Quite a few research results showed that laser treatments reduced the porosity and strengthened the coating adhesion in many coating/substrate systems [8][9][10][11][12][13]. Figure 3 shows the typical surface appearance of oxidized specimens prepared with and without the post-laser surface treatment.…”

Section: Oxidation Resistance Of Fecral-coated Tzm Alloy At 1100˝cmentioning

confidence: 99%

“…It has been reported that relatively high porosity, as well as poor adhesion in various coating/substrate systems, could be modified by such post-treatments. The laser surface melting process could significantly enhance the adhesion of the metallic coating layer to a substrate and reduce microdefects in the coating [8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Effect of Laser Surface Treatment on the Corrosion Behavior of FeCrAl-Coated TZM Alloy

Kim

Park

et al. 2016

Metals

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Abstract:The current study involves the coating of Titanium-Zirconium-Molybdenum (TZM) alloy with FeCrAl through plasma thermal spraying which proved effective in improving the oxidation resistance of the substrate. A post-laser surface melting treatment further enhanced the surface protection of the TZM alloy. Oxidation tests conducted at 1100˝C in air indicated that some Mo oxides were formed at the surface but a relatively small amount of weight reduction was observed for FeCrAl-coated TZM alloys up to 60 min of treatment. The post-laser surface treatment following the plasma thermal spray process apparently delayed the severe oxidation process and surface spalling of the alloy. It was suggested that the slow reduction in weight in the post-laser-treated specimen was related to fewer defects in the coating layer. It was also found that a surface reaction layer formed through the diffusion of Fe into the Mo alloy substrate at high temperature. The layer mainly consisted of Fe-saturated Mo and FeMo intermetallic compounds. In order to observe the corrosion behavior of the laser-treated alloy in 3.5% NaCl solution, electrochemical characteristics were also investigated. A proposed equivalent circuit model for the specimen indicated localized corrosion of coated alloy with some permeable defects in the coating layer.

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Improvement of solar absorbing property of Ni–Mo based thermal spray coatings by laser surface treatment

Cited by 18 publications

References 23 publications

A Comparative Study of Corrosion Resistance for HVAF-Sprayed Fe- and Co-Based Coatings

A Comparative Study of Corrosion Resistance for HVAF-Sprayed Fe- and Co-Based Coatings

Laser heat treatment of nickel-based alloys – a review

Effect of Laser Surface Treatment on the Corrosion Behavior of FeCrAl-Coated TZM Alloy

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