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51316-7630-Effect of Iron Content on Localized Corrosion Resistance of Ni-Cr-Mo Alloy Weld Overlays in Chloride

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Product Number: 51316-7630-SG
ISBN: 7630 2016 CP
Author: Qing Lu
Publication Date: 2016
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Corrosion-resistant weld overlays are often used to improve the service life of components made with an otherwise corrosion-prone material such as carbon or low alloy steels. One of the major concerns in arc welding overlay is iron dilution consequently influencing the corrosion performance of the weld overlays.Corrosion tests have been carried out to determine the effect of iron content on localised corrosion resistance of Ni-Cr-Mo alloy weld overlays in chloride ions containing environments. A range of iron contents i.e. 5 – 50% were examined using test coupons extracted from weld overlays. The iron content range was achieved by optimising the welding parameters where the weld overlays were deposited by gas tungsten arc welding (GTAW) (also known as tungsten inert gas welding TIG) and gas metal arc welding (GMAW) (also known as manual metal inert gas MIG) processes. Pitting corrosion potentials were determined in acidified 10%w/v NaCl solution at 25°C using potentiodynamic polarisation curve measurements. Critical pitting temperatures (CPTs) were determined by standards ASTM G150 in 1M NaCl and ASTM G48 Method C in 6%FeCl3 +1%HCl. Critical crevice temperatures (CCTs) were determined by ASTM G48 Method D in 6%FeCl3 +1%HCl. Pitting and crevice corrosion tests were also carried out in aerated artificial seawater in a range of temperatures from 25 to 70°C. The results showed that localised corrosion resistance of the weld overlays behaved very similarly with the iron content ranged between 5 and 15% and the resistance reduced significantly as the iron content increased to above 30% in the weld overlay. The results support a relaxation on maximum iron dilution of 5% which is currently used in industries.Key words: weld overlay iron content pitting corrosion potential critical pitting temperature (CPT) critical crevice temperature (CCT).
Corrosion-resistant weld overlays are often used to improve the service life of components made with an otherwise corrosion-prone material such as carbon or low alloy steels. One of the major concerns in arc welding overlay is iron dilution consequently influencing the corrosion performance of the weld overlays.Corrosion tests have been carried out to determine the effect of iron content on localised corrosion resistance of Ni-Cr-Mo alloy weld overlays in chloride ions containing environments. A range of iron contents i.e. 5 – 50% were examined using test coupons extracted from weld overlays. The iron content range was achieved by optimising the welding parameters where the weld overlays were deposited by gas tungsten arc welding (GTAW) (also known as tungsten inert gas welding TIG) and gas metal arc welding (GMAW) (also known as manual metal inert gas MIG) processes. Pitting corrosion potentials were determined in acidified 10%w/v NaCl solution at 25°C using potentiodynamic polarisation curve measurements. Critical pitting temperatures (CPTs) were determined by standards ASTM G150 in 1M NaCl and ASTM G48 Method C in 6%FeCl3 +1%HCl. Critical crevice temperatures (CCTs) were determined by ASTM G48 Method D in 6%FeCl3 +1%HCl. Pitting and crevice corrosion tests were also carried out in aerated artificial seawater in a range of temperatures from 25 to 70°C. The results showed that localised corrosion resistance of the weld overlays behaved very similarly with the iron content ranged between 5 and 15% and the resistance reduced significantly as the iron content increased to above 30% in the weld overlay. The results support a relaxation on maximum iron dilution of 5% which is currently used in industries.Key words: weld overlay iron content pitting corrosion potential critical pitting temperature (CPT) critical crevice temperature (CCT).
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Picture for Effect of Iron Content on Corrosion Resistance of Ni-Cr-Mo Alloy Weld Overlays in Corrosive Environm
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51316-7629-Effect of Iron Content on Corrosion Resistance of Ni-Cr-Mo Alloy Weld Overlays in Corrosive Environments

Product Number: 51316-7629-SG
ISBN: 7629 2016 CP
Author: Qing Lu
Publication Date: 2016
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Picture for Behavior of Steels and Alloys in Concentrated Sulphuric Acid under Different Flow Regimes – New Pers
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51316-7610-Behavior of Steels and Alloys in Concentrated Sulphuric Acid under Different Flow Regimes – New Perspectives

Product Number: 51316-7610-SG
ISBN: 7610 2016 CP
Author: Slawomir Kus
Publication Date: 2016
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Picture for 10262 Corrosion Resistance of Nickel Alloys and Super Austenitic Stainless Steel Weld Claddings
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10262 Corrosion Resistance of Nickel Alloys and Super Austenitic Stainless Steel Weld Claddings as a Function of Dilution

Product Number: 51300-10262-SG
ISBN: 10262 2010 CP
Author: Dirk Aberle, Martin Wolf and Friedrich Stenner
Publication Date: 2010
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Nickel alloys UNS N06625, UNS N06059, UNS N06022, UNS N08825 and one Special Stainless Steel (UNS N08031) are overlay welded in 1 to 3 layers on carbon steel. The dilution is measured and results of pitting corrosion in an immersion test with “Green Death” solution will be discussed.
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