Regulating the passive film of NiCoCrMo alloy in hydrofluoric acid solution by small addition of Cu

Li, Yunping; Xu, Xiandong; Hou, Yingwei; Zhang, Chen; Wang, Fenglin; Omura, K.; Koizumi, Yuichiro; Chiba, Akihiko

doi:10.1016/j.corsci.2015.05.024

Cited by 30 publications

(9 citation statements)

References 27 publications

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“…An addition of the optimum amounts of chromium (Cr), molybdenum (Mo) and tungsten (W) significantly increases the corrosion resistance in both reducing (like HCl, H 2 SO 4 ) and oxidizing environments (like HNO 3 ) as well as its resistance to localized corrosion [1,2,6]. For applications in HF and H 2 SO 4 , Fe-and Ni-based alloys containing Cu exhibit an enhanced corrosion resistance performance [7][8][9][10][11][12]. In Crrich alloys, Cr primarily forms a passive film of Cr 2 O 3 on the surface, thereby imparting better passivation properties [6,[13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…While the corrosion characteristics of wrought Fe and Ni alloys have been widely studied [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19], there is not much information regarding the corrosion behavior of their welds, although the welded regions are generally thought to be more prone to corrosion attack in aggressive environments. In the past, limited corrosion data have been generated for as-welded coupons in acidic solutions, but using this approach it is difficult to determine the individual susceptibility of the base metal and welded region to corrosion attack.…”

Section: Introductionmentioning

confidence: 99%

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Corrosion Study of Base Material and Welds of a Ni–Cr–Mo–W Alloy

Mishra

2017

Acta Metall. Sin. (Engl. Lett.)

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Alloys containing chromium (Cr) and molybdenum (Mo), as the major alloying elements, are widely used in various industries where the material experiences corrosive environments. Chromium (Cr), when added in an optimum amount, forms a Cr 2 O 3 passive film which protects the underlying metal in aggressive solutions. Molybdenum (Mo) forms its oxides in the low pH solutions, thus, enhances the uniform corrosion resistance of an alloy in reducing acids and assists in inhibition to localized corrosion. Minor alloying elements, like tungsten (W) and copper (Cu), also improve the overall corrosion resistance of an alloy in specific solutions. In the present study, corrosion resistance behavior of commercial ironbased alloys (316L SS, 254 SMO and 20Cb3) and nickel-based alloys (Monel 400, Alloy 625 and C-276) was studied in the acidic solutions. While the corrosion behavior of wrought alloys has been widely studied, there is little to no information on the corrosion performance of their welds, typically being the weak regions for corrosion initiation and propagation. Therefore, an attempt was undertaken to investigate the uniform and localized corrosion performance of base metal, simulated heat-affected zone and all-weld-metal samples of a Ni-Cr-Mo-W alloy, C-276. The study was conducted in aggressive acidic solutions. Various corrosion and surface analytical techniques were utilized to analyze the results.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Corrosion Study of Base Material and Welds of a Ni–Cr–Mo–W Alloy

Mishra

2017

Acta Metall. Sin. (Engl. Lett.)

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“…9 and 12(a), and plays an essential role in passivation. Present results, together with previous researches 18,34,36 suggest that enrichment of Cu on the passive lm will retard the dissolution of Cr 2 O 3 -rich layer at 0.83 V (SCE) during passivetranspassive transition. Besides, Cr element with a high energy of adsorption of oxygen DH ads (ox) is expected to adsorb hydroxyls (OH À ) strongly, and a low metal-metal bond energy 3 M-M is apt to enhance passivity, as suggested by Marcus et al…”

Section: Discussionmentioning

confidence: 76%

Effects of Cu addition on the corrosion behavior of NiCoCrMo alloys in neutral chloride solution

Yang

Gong

et al. 2017

RSC Adv.

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The influence of Cu addition (0-4 mass%) on the corrosion behavior of Ni-30Co-16Cr-15Mo alloy in neutral chloride solution is investigated by electrochemical measurements. The results indicate that alloy with 0.5 mass% Cu shows inferior corrosion resistance compared to Cu-free alloy under open-circuit potential, which is possibly ascribed to the galvanic corrosion from the insufficient coverage of Cu on the passive film; a higher fraction of Cu results in a significant improvement on corrosion resistance, and Cu is believed capable of strengthening the passivation and postponing the oxidization of dominant Cr (III) in the passive film into more soluble Cr(VI).

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“…The amount of Cu in the matrix is increased [91] with the addition of Cu, as an anodes substance during corrosion, because the standard potential for the redox couple Cu 2+ /Cu is positive. Cu alloy elements are separated on the sample surface and formed a compact Cu-rich passive film [105] in the atomic scale. This effect is connected with the presence of cathode element Cu dispersed in the ferrite matrix, stimulating the anodic polarization of the ferrite, and increasing the passivation process.…”

Section: Discusionmentioning

confidence: 99%

Untitled

2022

Metallofiz. Noveishie Tekhnol.

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Regulating the passive film of NiCoCrMo alloy in hydrofluoric acid solution by small addition of Cu

Cited by 30 publications

References 27 publications

Corrosion Study of Base Material and Welds of a Ni–Cr–Mo–W Alloy

Corrosion Study of Base Material and Welds of a Ni–Cr–Mo–W Alloy

Effects of Cu addition on the corrosion behavior of NiCoCrMo alloys in neutral chloride solution

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