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Uniform and Localized Corrosion Study of Base Material and Welds of Ni-Cr-Mo (W) Alloys

In the present study, corrosion behavior of base metal (BM), all-weld-metal (AWM) and heat-affected-zone (HAZ) samples of C-276 (UNS N10276), C-22 (UNS N06022) and C-2000 (UNS N06200) alloys were evaluated in concentrated hydrochloric (HCl), sulfuric (H2SO4) and nitric acid (HNO3).

 

Product Number: 51317--9406-SG
ISBN: 9406 2017 CP
Author: Ajit Mishra
Publication Date: 2017
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Corrosion resistant nickel-based alloys are extensively used in industries where other metallic system experiences high uniform and localized corrosion attack. The corrosion behavior of mill-annealed nickel-based alloys are widely studied in aggressive environments but there is not much information available for the corrosion performance of their welded region even though welds are relatively susceptible to corrosion attack compared to the base material.In the present study corrosion behavior of base metal (BM) all-weld-metal (AWM) and heat-affected-zone (HAZ) samples of C-276 (UNS N10276) C-22 (UNS N06022) and C-2000 (UNS N06200) alloys was evaluated in concentrated hydrochloric (HCl) sulfuric (H2SO4) and nitric acid (HNO3). Also the critical pitting temperature (CPT) and critical crevice temperature (CCT) of AWM specimens was obtained and compared with the BM. The results were analyzed using weight change measurements electrochemical techniques and a range of surface analytical tools.

Key Words: Ni-Cr-Mo (W) Alloys, All-Weld-Metal, Heat-Affected-Zone, Acids, Critical Pitting Temperature, Critical Crevice Temperature, Potentiodynamic Technique, SEM, XRD

 

 

Corrosion resistant nickel-based alloys are extensively used in industries where other metallic system experiences high uniform and localized corrosion attack. The corrosion behavior of mill-annealed nickel-based alloys are widely studied in aggressive environments but there is not much information available for the corrosion performance of their welded region even though welds are relatively susceptible to corrosion attack compared to the base material.In the present study corrosion behavior of base metal (BM) all-weld-metal (AWM) and heat-affected-zone (HAZ) samples of C-276 (UNS N10276) C-22 (UNS N06022) and C-2000 (UNS N06200) alloys was evaluated in concentrated hydrochloric (HCl) sulfuric (H2SO4) and nitric acid (HNO3). Also the critical pitting temperature (CPT) and critical crevice temperature (CCT) of AWM specimens was obtained and compared with the BM. The results were analyzed using weight change measurements electrochemical techniques and a range of surface analytical tools.

Key Words: Ni-Cr-Mo (W) Alloys, All-Weld-Metal, Heat-Affected-Zone, Acids, Critical Pitting Temperature, Critical Crevice Temperature, Potentiodynamic Technique, SEM, XRD

 

 

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Picture for The Sensitisation Behaviour of Alloy UNS N08825 After Heat Treatment as Used in Clad Materials
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The Sensitisation Behaviour of Alloy UNS N08825 After Heat Treatment as Used in Clad Materials

Product Number: 51317--9459-SG
ISBN: 9459 2017 CP
Author: Helena Alves
Publication Date: 2017
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The aim of this paper is to present recent standard test corrosion data obtained in laboratory for alloy UNS N08825 after post weld heat treatment in comparison with as delivered (soft annealed) material.