Performance of Corrosion-Resistant Alloys in Concentrated Acids

Mishra, Ajit

doi:10.1007/s40195-017-0538-y

Cited by 27 publications

(20 citation statements)

References 21 publications

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“…The corrosion rate at 60 • C has a negative value during 24 h-60 h, and the value after 72 h is slightly smaller than that at 50 • C. It is assumed that the localized corrosion and adhering corrosion products result in the unusual fluctuation, which was observed in the research on Ni-Cr-Mo alloy corrosion [38,39]. Hence, the measurement and calculation of corrosion rate were misled by this highly localized deterioration and incomplete removal of corrosion products [70]. Specifically, the negative corrosion rate at 60 • C probably resulted from the additional corrosion products remaining after the cleaning process.…”

Section: Corrosion Rate Analysismentioning

confidence: 99%

Corrosion Behavior of a Ni–Cr–Mo Alloy Coating Fabricated by Laser Cladding in a Simulated Sulfuric Acid Dew Point Corrosion Environment

et al. 2020

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For this study, aimed at proposing a potential direction to prevent sulfuric acid dew point corrosion, a Ni–Cr–Mo alloy Hastelloy C22 coating was fabricated by coaxial laser cladding technology. The phase composition, microstructure, and corrosion behavior in a simulated sulfuric acid dew point corrosion environment were investigated and compared with a Hastelloy C22 alloy, a titanium alloy TC4, and 09CrCuSb steel (ND). The results showed that the phase composition of the C22 coating is essentially similar to that of the C22 alloy, consisting of a γ-Ni solid solution and Ni6Mo6C1.06. The finer microstructure of the C22 coating mainly contains eutectic and dentrite, presenting a typical solidification feature of laser cladding. The corrosion resistance of the C22 coating is very close to that of the C22 alloy, and outclasses that of TC4 and ND. The corrosion behavior of the C22 coating is intergranular corrosion resulting from the segregation of molybdenum, chromium containing corrosion products, and smaller anode micro-batteries.

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Section: Corrosion Rate Analysismentioning

confidence: 99%

Corrosion Behavior of a Ni–Cr–Mo Alloy Coating Fabricated by Laser Cladding in a Simulated Sulfuric Acid Dew Point Corrosion Environment

et al. 2020

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“…A recent study [6,13] performed on a wide range of corrosion-resistant Ni-Cr-Mo and Ni-Cr-Mo-W alloys in various acidic solutions suggested that Mo (or Mo and W) forms a protective oxide in low pH-reducing acids (like HCl, H 2 SO 4 and H 3 PO 4 ), responsible for an enhanced corrosion resistance performance in Mo-rich alloys, Available online at http://link.springer.com/journal/40195 & Ajit Mishra ajitosu@gmail.com…”

Section: Introductionmentioning

confidence: 98%

“…Iron (Fe)-and nickel (Ni)-based alloys are widely used in aggressive environments because of their excellent corrosion resistance and high mechanical strength which can be attributed to their alloying compositions [1][2][3][4][5]. 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].…”

Section: Introductionmentioning

confidence: 99%

“…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]. Molybdenum and tungsten are known to inhibit localized corrosion by oxide formation within the pit, thereby retarding the pit/crevice growth [6,[13][14][15][16][17][18][19].…”

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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“…Alloying elements can be added to Ni alloys to produce a wide variety of alloys such as Cr and Mo which give the alloys a high corrosion resistance [7][8][9][10]. If the Cr is sufficient enough, the Cr2O3 passive oxide layer is grown on the surface [11]. The use of Ni alloys as structural materials depends highly on the concentration and the proportion of alloying components, in particular Cr and Mo [12,13].…”

Section: Introductionmentioning

confidence: 99%

Corrosion behavior of Ni and Ni-base alloy in acidic solutions

Mohamed¹

2020

Egypt. J. Chem.

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The corrosion behavior of pure Ni and 65Ni-24Cr-10Mo alloy in HCl and H2SO4 solutions were investigated using weight-loss and electrochemical methods. The effects of temperature and acidic media were studied to define the main differences in the corrosion behavior of these materials. The results of both techniques revealed lower values of corrosion rates for the 65Ni-24Cr-10Mo alloy compared to pure Ni. Generally, the corrosion rates for both materials increase with increasing temperature in both acids with higher rates in HCl compared to H2SO4 at all conditions. Results of weight-loss and potentiodynamic tests were in a good agreement and indicated that the alloy 65Ni-24Cr-10Mo is a high resistance to corrosion in HCl and H2SO4 acidic solutions than pure Ni. The activation energies ( ) of the dissolution process of Ni and alloy have calculated. The activation energy of Ni in HCl is 18 kJ/mole and in H2SO4 is 20 kJ/mole where for the alloy in HCl is 18 kJ/mole and in H2SO4 is 32 kJ/mole.

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Performance of Corrosion-Resistant Alloys in Concentrated Acids

Cited by 27 publications

References 21 publications

Corrosion Behavior of a Ni–Cr–Mo Alloy Coating Fabricated by Laser Cladding in a Simulated Sulfuric Acid Dew Point Corrosion Environment

Corrosion Behavior of a Ni–Cr–Mo Alloy Coating Fabricated by Laser Cladding in a Simulated Sulfuric Acid Dew Point Corrosion Environment

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

Corrosion behavior of Ni and Ni-base alloy in acidic solutions

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