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Materials Performance of Corrosion-Resistant Alloys in Individual and Mixed Acids

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In the present study, corrosion tests were performed using both weight loss and electrochemical techniques for Ni-Cr-Mo (W) alloys in hydrochloric (HCl), sulfuric (H2SO4), nitric (HNO3) acids and their various combinations.

 

Product Number: 51317--9409-SG
ISBN: 9409 2017 CP
Author: Ajit Mishra
Publication Date: 2017
Industry: Materials Selection and Design
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Nickel-based alloys containing optimum amount of chromium (Cr) molybdenum (Mo) and tungsten (W) are widely used in the chemical process industries due to their tolerance to both oxidizing and reducing conditions. Surprisingly most of the corrosion data available in literature for the corrosion-resistant alloys (CRA’s) are in individual acids which seldom replicate the field conditions. Although it is not feasible to exactly reproduce the field environment in a laboratory set-up but a better approach to understand the materials performance in field can be by conducting the corrosion tests in both individual and mixed acids.One of the most commonly used technique by industrial researchers to determine an alloy corrosion performance in a corrosive environment is weight change measurement method. In the present study corrosion tests were conducted using weight loss and electrochemical techniques for B-3 (UNS N10675) HYBRID-BC1 (UNS N10362) C-276 (UNS N10276) C-22 (UNS N06022) and C-2000 (UNS N06200) alloys in hydrochloric (HCl) sulfuric (H2SO4) nitric (HNO3) acids and their various combinations. For the comparative purposes corrosion tests were also conducted for 304L SS (UNS S30403) and 316L SS (UNS S31603) alloys in few of the above-mentioned acidic media. Further an attempt was made to correlate the corrosion performance of various alloys in individual and mixed acids based on the amount of their alloying elements.

Keywods: Ni-Cr-Mo Alloys, Ni-Cr-Mo-W Alloys, Stainless Steel, Hydrochloric Acid, Sulfuric Acid, Nitric Acid, Mixed Acids, Iso-Corrosion Curve, Potentiodynamic Polarization Technique

Nickel-based alloys containing optimum amount of chromium (Cr) molybdenum (Mo) and tungsten (W) are widely used in the chemical process industries due to their tolerance to both oxidizing and reducing conditions. Surprisingly most of the corrosion data available in literature for the corrosion-resistant alloys (CRA’s) are in individual acids which seldom replicate the field conditions. Although it is not feasible to exactly reproduce the field environment in a laboratory set-up but a better approach to understand the materials performance in field can be by conducting the corrosion tests in both individual and mixed acids.One of the most commonly used technique by industrial researchers to determine an alloy corrosion performance in a corrosive environment is weight change measurement method. In the present study corrosion tests were conducted using weight loss and electrochemical techniques for B-3 (UNS N10675) HYBRID-BC1 (UNS N10362) C-276 (UNS N10276) C-22 (UNS N06022) and C-2000 (UNS N06200) alloys in hydrochloric (HCl) sulfuric (H2SO4) nitric (HNO3) acids and their various combinations. For the comparative purposes corrosion tests were also conducted for 304L SS (UNS S30403) and 316L SS (UNS S31603) alloys in few of the above-mentioned acidic media. Further an attempt was made to correlate the corrosion performance of various alloys in individual and mixed acids based on the amount of their alloying elements.

Keywods: Ni-Cr-Mo Alloys, Ni-Cr-Mo-W Alloys, Stainless Steel, Hydrochloric Acid, Sulfuric Acid, Nitric Acid, Mixed Acids, Iso-Corrosion Curve, Potentiodynamic Polarization Technique

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51312-01443-SUMMARY OF SOME NICKEL ALLOYS USED IN CHEMICAL PRODUCTION INVOLVING HYDROCHLORIC AND SULFURIC ACIDS

Product Number: 51312-01443-SG
ISBN: 01443 2012 CP
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Sulfuric and hydrochloric acids are among the most common chemicals produced.in the process industry.  Nickel alloys have been a traditional material of choice. This paper will review the alloys available for this service as well as identify the temperature limits and other conditions that should be considered when selecting an alloy.
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04233 Alloy Selection for Dilute and Medium Concentration Sulfuric Acid

Product Number: 51300-04233-SG
ISBN: 04233 2004 CP
Author: Ulrich Brill and Helena Alves, ThyssenKrupp VDM GmbH
Publication Date: 2004
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Sulfuric acid is one of the most important elementary substances of the chemical industry.  There is no stainless steel or even a nickel base alloy available which is suitable over the entire concentration range.  This paper will give corrosion data in up to 75 % sulfuric acid at boiling temperature for various commercial grades as well as for some new developmental alloys.
Picture for The Performance of Corrosion Resistant Ni-Cr-Mo Alloys in Concentrated Hydrochloric Acid
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51317--9639-The Performance of Corrosion Resistant Ni-Cr-Mo Alloys in Concentrated Hydrochloric Acid

Product Number: 51317--9639-SG
ISBN: 9639 2017 CP
Author: Suresh Divi
Publication Date: 2017
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This paper is to study the corrosion performance of various Ni based alloys in high concentrations of HCl acids below the boiling point. Nickel-based alloys C-276 (UNS N10276), C-22 (UNS N06022), C-2000 (UNS N06200), Hybrid-BC1 (UNS N10362) and B-3 (UNS N10675) were investigated.

 
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