AMPP Store - Products tagged with 'repassivation'

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09427 Electrochemical Methods for Repassivation Potential Measurements

Product Number: 51300-09427-SG

ISBN: 09427 2009 CP

Author: C. Mabel Giordano, Martin A. Rodriguez, Ricardo M. Carranza and Raul B. Rebak

Publication Date: 2009

$20.00

The susceptibility of Alloy 22 (N06022) to crevice corrosion may depend on environmental and metallurgical variables and it was mostly tested to obtain crevice repassivation potentials.

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51316-7113-Relation Between Localized Corrosion And SCC In Nickel Based Alloys In HP/HT Oil And Gas Environments

Product Number: 51316-7113-SG

ISBN: 7113 2016 CP

Author: Thodla Ramgopal

Publication Date: 2016

$20.00

Fatigue and fracture performance of UNS N07718 (718) and UNS N07716 (625+) in sour environments over a range of temperatures (300 to 400°F) and chloride concentrations (0.15wt% to 25wt% NaCl). Rising displacement fracture toughness test performed in a range of environments.

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51318-10836-Stability of buffer solutions for SSC test in stainless steel OCTG material from experimental approach

Product Number: 51318-10836-SG

Author: Yasuhide Ishiguro / Takashi Kawano / Kazuki Fujimura

Publication Date: 2018

$20.00

The stability of buffer solutions for martensitic stainless steel OCTG material was experimentally evaluated by the scratch repassivation technique in electrochemical measurements.

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51318-11273-Repassivation behavior of lean duplex stainless steels in chloride and thiosulfate environments

Product Number: 51318-11273-SG

Author: Liang He / Preet M. Singh

Publication Date: 2018

$20.00

In this paper, the repassivation kinetics of lean duplex stainless steels in environments containing chloride as well as thiosulfate ions was studied through the scratch test method.

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AMPP SP21518-2022, Recovery and Repassivation after Low pH Excursions in Open Recirculating Cooling Water Systems

Product Number: AMPP SP21518-2022

Publication Date: 2022

$109.00

This standard practice presents guidelines for preplanning for, recovering from, and repassivation after a low pH excursion in open recirculating water systems, no matter what the cause. The procedures presented in this standard inno way preclude the use of other procedures but are presented as best practices developed over years of experienceinavarietyofplants.Theprovisionsofthisstandardshouldbeappliedunderthedirectionofqualifiedwater-treatmentpersonnelfromwater-treatmentsuppliersand/orconsultants andplantpersonnel.

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Comparison of stress corrosion cracking behavior of Fe13Cr5Ni- and Fe17Cr5.5Ni- based high chromium stainless steels in HPHT CO2 environments

Product Number: 51320-14695-SG

Author: Yameng Qi, Chunxia Zhang, Zhonghua Zhang

Publication Date: 2020

$20.00

The stress corrosion cracking (SCC) behavior of Fe13Cr5Ni- and Fe17Cr5.5Ni-based alloys in HTHP CO2 environments was investigated through slow strain rate tests (SSRT) and electrochemical methods. The results show that a remarkable decrease in tensile strength and elongation to failure was observed when testing in CO2 environment as compared with air. Fe17Cr5.5Ni-based alloys possessed better SCC resistance than Fe13Cr5Ni-based alloys. The increase of Cr and Ni content tended to enhance the resistance to SCC and pitting corrosion. The SCC behaviors of Fe13Cr5Ni- and Fe17Cr5.5Ni-based alloys were closely associated with the repassivation capacity and the resistance to pitting corrosion.

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Effect of Pre-pits on Localized Corrosion and Sulfide Stress Cracking Resistance of Duplex Stainless Steel UNS S32205 in Upstream Production Environments

Product Number: 51324-21031-SG

Author: Guru Prasad Sundararajan; V.T. Aruna; Marc E. Wilms; Navashree Surendran

Publication Date: 2024

$40.00

Components in upstream Oil and Gas production such as flowlines, storage vessels or injector pipelines which are made of duplex stainless steel UNS S32205 can undergo localized corrosion such as pitting or crevice corrosion when exposed to oxygen during shutdowns or turn arounds. Such unintended exposure to oxygen is related to poor maintenance or improper preservation and would normally require replacement of equipment. Further use of such pitted components can be considered but requires re-assessment of the pre-corroded material. Open-circuit Potential (OCP) and repassivation potentials (Erp) were measured on UNS S32205 in simulated flowline brines containing 150,000 mg/L Cl- at 110oC with pCO2 of 4.1 bara. The effect of pre-pits on bare and girth welded UNS S32205 was determined by creating artificial pits at OCP under oxygenated brine conditions and then switching the gaseous environment to sweet (CO2) conditions with continuous OCP monitoring. It was found that in oxygen-free CO2 production environments, existing pits did not grow. Sulfide Stress Cracking (SSC) resistance of pre-pitted solution annealed UNS S32205 specimens was determined through Slow Strain Rate Testing (SSRT) and Ripple Load Testing (RLT) at 90oC in concentrated chloride solutions. An electrochemical method was applied to create a single pit on the gauge surface. Comparison of SSRT and RLT results showed that SSRT is too aggressive for determining the pH2S limits. RLT of both pristine and pre-pitted UNS S32205 in concentrated chlorides with up to 0.3 bara pH2S did not show rupture, while selective attack of the ferrite phase was found (pit-depth < 30µm). RLT of notched UNS S32205 specimens were compared to that of pre-pitted specimens. Implications of these results on the limits recommended in ISO15156 / NACE MR0175 are discussed.

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Localized Corrosion Limit of Use of S13%Cr (UNS S41427) Connector in Converted Injection Treated Seawater Well

Product Number: 51324-20714-SG

Author: Nicolas Larché; Marianne Kleive; Charles Leballeur; Eva Malmanger

Publication Date: 2024

$40.00

Many systems can be converted and used for different applications not initially planned. This is the case for production wells, sometimes converted into water injection wells and for which the production tubing material selection is clearly not adapted for prolonged contact with natural seawater. Oxygen removal treatment must be applied but precise control is not obvious and excursions above zero or close-to-zero oxygen can occur. The production tubing material S13%Cr are known to be sensitive to dissolved oxygen excursions in seawater, but data from the literature cannot precisely help in defining the allowed limits of use. Exploring the possibility to convert a production well into a treated seawater injection well then requires a careful assessment of the corrosion resistance limits of the involved alloys. A series of corrosion tests in treated seawater were designed to assess the limits of use of fast connector made of alloy UNS S41427. The corrosion tests were performed both at laboratory scale and on full-scale fast connectors in a treated seawater flow loops simulating service conditions. For all the performed tests, maintaining the dissolved oxygen content (DOC) at 15 ppb and below never led to localized corrosion and has been considered as a safe condition in terms of corrosion risk for alloy S41427 at ambient temperature. It was found that prolonged dissolved oxygen content (DOC) above 30±10 ppb may lead to initial crevice corrosion after only 4 h of exposure. Globally, a very good correlation between the laboratory and the full-scale test results was found. The critical crevice potential for alloy S41427 was significantly affected by the cleaning process of the tested coupons, while the stop of the corrosion was always measured for potentials reached at DOC < 10 ppb. The proposed methodology, involving both laboratory and full-scale tests, allowed to precisely quantify the limits of use of UNS S41427 in treated injection well. It could be used for any other material and applications to help at designing adapted and reliable engineering diagrams for material selections.

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RP0392-1992, Recovery and Repassivation After Low pH Excursions in Open Recirculating Cooling Water Systems

Product Number: 53089-HD1992

Author: NACE International

Publication Date: 1992

$179.00

Guidelines for preparing for, recovering from, and repassivation after a low pH excursion... Procedures applicable to mild steel and need to be modified for other materials. Historical Document 1992

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RP0392-HD1995-SG Recovery and Repassivation After Low pH Excursions in Open Recirculating Cooling Water Systems-HD1995

Product Number: 21055-HD1995

Author: NACE International

Publication Date: 1995

$179.00

Guidelines for preplanning for, recovering from, and repassivation after a low pH excursion in open recirculating water systems, no matter what the cause. Historical Document 1995

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The Corrosion Susceptibility Index- A Physics-Based Indicator of Localized Corrosion and Environmental Assisted Cracking Susceptibility for Alloys

Product Number: 51323-19408-SG

Author: Christopher D Taylor

Publication Date: 2023

$20.00

During crack growth and localized corrosion, fresh metal surfaces become exposed to the chemical and electrochemical environment. Subsequent alteration of the material in the nascent pit or at the crack tip zone will be initiated by the surface chemical processes that template the subsequent reactivity. Quantum chemical calculations can provide a physics-based method to simulate the adsorption phenomena that occur in systems possessing multiple chemical species (such as water, chloride, hydrogen-sulfide, inhibitors, etc.), various pH levels, temperatures and electrochemical conditions.

Products tagged with 'repassivation'

Association for Materials Protection and Performance