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51315-5456-Corrosion Evaluation of Ni-Cr-Mo Alloys in Acidic Solutions

Product Number: 51315-5456-SG
ISBN: 5456 2015 CP
Author: Brian DeForce
Publication Date: 2015
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Nickel-chromium-molybdenum (Ni-Cr-Mo) alloys are used in the chemical processing industry for very aggressive conditions. They have a long history of use in acids such as hydrochloric (HCl) and sulfuric (H2SO4) over a range of concentrations and temperature. Selection of the appropriate Ni-Cr-Mo alloy for a given environment is not always straightforward. This paper compares the corrosion resistance of three common highly corrosion-resistant alloys in several acid solutions. The corrosion resistance of UNS N10276[1] UNS N06022 and UNS N06059 were measured in four environments. The solutions used were 10% HCl at 40 °C 35% HCl at 50 °C 20% H2SO4 at the boiling point and 85% H2SO4 at the boiling point. Additionally the effect of chloride on sulfuric acid corrosion was investigated in a boiling solution of 5% H2SO4 with 2000 ppm of chloride. The results show that the ranking of these alloys relative to corrosion resistance is dependent on the specific environment.[1] Unified Numbering System for Metals and Alloys (UNS). UNS numbers are listed in the Metals & Alloys in the Unified Numbering System 12th ed. (Warrendale PA: SAE International and West Conhonshoken PA: ASTM International 2012).
Nickel-chromium-molybdenum (Ni-Cr-Mo) alloys are used in the chemical processing industry for very aggressive conditions. They have a long history of use in acids such as hydrochloric (HCl) and sulfuric (H2SO4) over a range of concentrations and temperature. Selection of the appropriate Ni-Cr-Mo alloy for a given environment is not always straightforward. This paper compares the corrosion resistance of three common highly corrosion-resistant alloys in several acid solutions. The corrosion resistance of UNS N10276[1] UNS N06022 and UNS N06059 were measured in four environments. The solutions used were 10% HCl at 40 °C 35% HCl at 50 °C 20% H2SO4 at the boiling point and 85% H2SO4 at the boiling point. Additionally the effect of chloride on sulfuric acid corrosion was investigated in a boiling solution of 5% H2SO4 with 2000 ppm of chloride. The results show that the ranking of these alloys relative to corrosion resistance is dependent on the specific environment.[1] Unified Numbering System for Metals and Alloys (UNS). UNS numbers are listed in the Metals & Alloys in the Unified Numbering System 12th ed. (Warrendale PA: SAE International and West Conhonshoken PA: ASTM International 2012).
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51315-5430-Corrosion of Ni-based Alloys and Stainless Steels in Mixed Acids and Salts—Experimental and Modeling Results

Product Number: 51315-5430-SG
ISBN: 5430 2015 CP
Author: Narasi Sridhar
Publication Date: 2015
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