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Picture for High Resolution CT Scan as Tool for Precise Quantification of Material Loss due to Localized Corrosion in Brake Calipers
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High Resolution CT Scan as Tool for Precise Quantification of Material Loss due to Localized Corrosion in Brake Calipers

Product Number: 51321-16467-SG
Author: Marco Bandiera/Andrea Bonfanti/Federico Bertasi/Alessandro Mancini
Publication Date: 2021
$20.00
Picture for High Sensitive Sensors for Collection of Cathodic Polarization Data and Determination of Protection Potential Criteria of Buried Structures
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High Sensitive Sensors for Collection of Cathodic Polarization Data and Determination of Protection Potential Criteria of Buried Structures

Product Number: 51319-12896-SG
Author: Erwan Diler
Publication Date: 2019
$20.00

The installation of metallic coupons in the vicinity of buried pipes under cathodic protection (CP) allows theoretically to measure the potential and the current density through the simulated coating defect. Nevertheless this type of monitored coupon does not provide direct information on the actual efficiency of the CP and corrosion rates that could be caused by a CP failure over time or not adapted CP design. According to the soil resistivity and the corrosion potential in absence of CP a protection potential is generally targeted following the standard recommendations. However the soil resistivity as well as the corrosion potential might depend on the seasonal fluctuations and the protection potential might vary as function of the considered standard. Moreover all soils parameters cannot be considered in recommendations from standards and cathodic protection criteria can be sometimes debatable.In this study very sensitive electrical resistance (ER) sensors allowing obtaining precise corrosion data in real-time were adapted for soil applications. They were used in the selected soils and conditions to determine the off potential and current density corresponding to a corrosion rate of 10 µm/year which corresponds to the maximal corrosion rate of buried structures considered as protected according the standard ISO 15589-1:2015. The adapted ER sensors appeared to be particularly suitable for determining the protection potential and CP criteria in a relatively short time. For the tested soils and conditions the results showed that the cathodic protection criteria recommended in ISO 15589-1: 2015 are conservative compared to those measured experimentally. This method therefore seems particularly relevant for the determination of the protection potential in complex or polluted media in the absence of data in the literature.

	Picture for High Strength Austentitic Stainless Steels for Hydrogen Applications at High Strength
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High Strength Austentitic Stainless Steels for Hydrogen Applications at High Strength

Product Number: 51324-20780-SG
Author: Clara Herrera; Merlin Seifert
Publication Date: 2024
$40.00
Hydrogen can be the future energy carrier as it might offer a substitute for fossil fuels. However, it can degrade the mechanical properties of many materials, a phenomenon well known as hydrogen embrittlement (HE) that can lead to a catastrophic failure. Austenitic stainless steels (ASS), especially UNS S31603 with a minimum yield strength (YS) of 170 MPa (25 ksi), is frequently used for hydrogen applications due to its low susceptibility to HE compared with other ASSs. However, ASS cannot be used when high strength (YS > 500 MPa) is required. Nitrogen-strengthened (e.g. UNS S20910) and CrMn(NiMo)N austenitic stainless steels in strain-hardened condition show a YS higher than 758 MPa (110 ksi) and are resistant to HE when tested in 100 bar (10 MPa) H2 atmosphere at room temperature. This paper discusses the susceptibility of high strength austenitic stainless steels, UNS S20910 and CrMnNiMoN (18Cr-18Mn-4Ni-2Mo), in strain hardened-condition to HE at higher H2 pressure. Slow strain rate tensile tests (SSRT) were carried out in hydrogen atmosphere at 1000 bar (100 MPa) and room temperature. Both austenitic stainless steels exhibit YS > 758 MPa (110 ksi) and UTS > 900 MPa (130 ksi). UNS S20910 and CrMnNiMoN austenitic stainless steels are resistant to HE, showing a ductile fracture. Although CrMnNiMoN present a reduction in ductility, its relative reduction of aera is higher than 80 %. Their fracture mode is ductile, characterized by microvoids and dimples. UNS S20910 and CrMnNiMoN can be an option for high-pressure hydrogen applications when high strength is required.