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Critical Factors Affecting the Pitting Corrosion Resistance of Additively Manufactured Ni-based Alloy in Chloride Containing Environments

Picture for Critical Factors Affecting the Pitting Corrosion Resistance of Additively Manufactured Ni-based Alloy
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Additive manufacturing can manufacture components that were previously impossible - without compromising strength, ductility and corrosion resistance. The pitting corrosion resistance of a selective laser melted Nickel alloy has been evaluated by electrochemical methods. 

Product Number: 51317--9345-SG
ISBN: 9345 2017 CP
Author: Helmuth Sarmiento Klapper
Publication Date: 2017
Industry: Materials Selection and Design
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Precipitation-hardened nickel-based alloys have a long tradition in oilfield applications. Due to their high strength good ductility and excellent environmentally assisted cracking resistance they have been successfully used for wellhead components artificial lift applications and directional drilling tools particularly in demanding environments where superior corrosion resistance is necessary. Additive manufacturing is breaking into the oil and gas industry with current research efforts focused on demonstrating suitability for manufacturing components that were previously impossible to produce with conventional subtractive manufacturing processes without compromising material properties such as strength ductility and corrosion resistance. The pitting corrosion resistance of a direct metal laser melted Ni-based alloy having a similar chemical composition to alloy UNS N07718 in chloride-containing solutions has been evaluated by electrochemical methods. Results from cyclic potentiodynamic polarization curves demonstrate that with comparable surface quality the additively manufactured Ni-based alloy behaves similar with regard to pitting corrosion susceptibility to UNS N07718 wrought material in chloride containing environments.

Key words: Pitting corrosion, UNS N07718, Selective Laser Melting, Cyclic potentiodynamic tests

Precipitation-hardened nickel-based alloys have a long tradition in oilfield applications. Due to their high strength good ductility and excellent environmentally assisted cracking resistance they have been successfully used for wellhead components artificial lift applications and directional drilling tools particularly in demanding environments where superior corrosion resistance is necessary. Additive manufacturing is breaking into the oil and gas industry with current research efforts focused on demonstrating suitability for manufacturing components that were previously impossible to produce with conventional subtractive manufacturing processes without compromising material properties such as strength ductility and corrosion resistance. The pitting corrosion resistance of a direct metal laser melted Ni-based alloy having a similar chemical composition to alloy UNS N07718 in chloride-containing solutions has been evaluated by electrochemical methods. Results from cyclic potentiodynamic polarization curves demonstrate that with comparable surface quality the additively manufactured Ni-based alloy behaves similar with regard to pitting corrosion susceptibility to UNS N07718 wrought material in chloride containing environments.

Key words: Pitting corrosion, UNS N07718, Selective Laser Melting, Cyclic potentiodynamic tests

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51317--9667-Additive Manufacturing for Sour Service: an Experimental Investigation

Product Number: 51317--9667-SG
ISBN: 9667 2017 CP
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The overall goal was to determine if a set of additive manufacturing (AM) parts could comply with the testing requirements of wrought or welded materials for sour service as outlined in NACE MR0175 / ISO 15156-3:2015. Recommendations for a qualification pathway for AM parts in sour service are included.

 
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51318-11171-Exploring the Corrosion Behavior of Alloy UNS N07718 Manufactured by Additive Manufacturing Under Different Building Directions

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Author: Filippo Cappuccini / Angelo Donato / Domenico Di Pietro / Antonella Dimatteo
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The main scope of this work is to explore different process configurations to understand the corrosion response of additive manufactured alloys and to suggest the parameters to be controlled for future qualification in sour environment.
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51318-11087-Corrosion Behavior of Additively Manufactured Alloy N06210 in acidic solutions

Product Number: 51318-11087-SG
Author: Yuzo DAIGO / Katsuo SUGAHARA / Syuhei OGOSHI / Kosuke KUWABARA
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Corrosion rates of low porosity AM S31603 and AM N06210 in several kinds of acidic solutions were similar to those of wrought alloys respectively, the corrosion rates of AM S31603 and AM N06210 became higher with increasing porosity of each specimen.
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