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10265 High Corrosion Resistant Metallic Coatings for Oilfield Applications Exposed to Aggressive Environments

Picture for 10265 High Corrosion Resistant Metallic Coatings for Oilfield Applications
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Product Number: 51300-10265-SG
ISBN: 10265 2010 CP
Author: Haralampos Tsaprailis, Joshua Tuggle, Steven Waters, William Kovacs III, and Luis Garfias-Mesias
Publication Date: 2010
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$20.00
$20.00
Highly corrosion resistance alloys (HCRAs) are becoming more popular for oilfield applications, where not only corrosion resistance is important, but also mechanical integrity and long term reliability. These materials are often exposed to a wide variety of aggressive environments that can range from marine splash zone to down-hole sour environments. The fabrication of these HCRAs metallic coatings typically involves coating low grade carbon steels with one or different layers of the HCRAs using techniques such as thermal spray coating, chemical vapor deposition, weld overlay, electrodeposition, etc. Previous work by the authors has described a novel testing methodology, based on the zero resistance amperometry (ZRA), which allows the determination of the critical pitting temperature (CPT) as well as the critical crevice temperature (CCT) in small angular sectioned samples taken from actual production hydraulic cylinders. In this paper, the CPT and CCT measurements that were successfully employed for evaluating UNS N06625 weld overlay materials compared with two potential HCRAs coated steels (UNS R31233 and UNS W73021). The main objective was to develop a rapid approach for the relative ranking of these materials for aggressive offshore applications. From the results obtained in this work, it is expected that the UNS W73021 weld overlay should have relatively better performance than the UNS N06625 weld overlays, which is expected to have relatively better performance than the R31233 weld overlays.

Keywords: critical pitting temperature, critical crevice temperature, corrosion resistance alloy, weld overlay, UNS N00625, UNS R31233, UNS W73021
Highly corrosion resistance alloys (HCRAs) are becoming more popular for oilfield applications, where not only corrosion resistance is important, but also mechanical integrity and long term reliability. These materials are often exposed to a wide variety of aggressive environments that can range from marine splash zone to down-hole sour environments. The fabrication of these HCRAs metallic coatings typically involves coating low grade carbon steels with one or different layers of the HCRAs using techniques such as thermal spray coating, chemical vapor deposition, weld overlay, electrodeposition, etc. Previous work by the authors has described a novel testing methodology, based on the zero resistance amperometry (ZRA), which allows the determination of the critical pitting temperature (CPT) as well as the critical crevice temperature (CCT) in small angular sectioned samples taken from actual production hydraulic cylinders. In this paper, the CPT and CCT measurements that were successfully employed for evaluating UNS N06625 weld overlay materials compared with two potential HCRAs coated steels (UNS R31233 and UNS W73021). The main objective was to develop a rapid approach for the relative ranking of these materials for aggressive offshore applications. From the results obtained in this work, it is expected that the UNS W73021 weld overlay should have relatively better performance than the UNS N06625 weld overlays, which is expected to have relatively better performance than the R31233 weld overlays.

Keywords: critical pitting temperature, critical crevice temperature, corrosion resistance alloy, weld overlay, UNS N00625, UNS R31233, UNS W73021
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