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Publications (11)
The effect of oxides on hydrogen uptake and diffusion in corrosion resistant alloys (CRA) under cathodic protection conditions was investigated by use of the electrochemical hydrogen permeation method with the unique added feature of in-situ removal of the oxide film by introducing a grinding stick in the cathodic cell compartment. Three CRA materi...
In some cases, the materials selection for subsea fasteners requires resistance to corrosion in seawater and, also, adequate hydrogen embrittlement (HE) resistance due to plausible connection to the cathodic protection system. In this work, selected materials were subject to incremental step loading testing under cathodic protection polarization in...
Three different strain hardened austenitic corrosion resistant alloys with chemical compositions providing high pitting resistance equivalent (PREN), have been tested for susceptibility to hydrogen. The grades were UNS N08034, UNS N08935 and DIN no. 1.4675 (a proprietary grade with no UNS number).
The strain hardened corrosion resistant alloys were...
A subsea fastener made of Alloy 716 (UNS N07716) experienced a brittle fracture in service. The investigations described herein suggested that the failure was caused by hydrogen stress cracking (HSC), thus, adding to the number of reported HSC incidents on precipitation hardened nickel-based alloys over the last two decades. Incremental step loadin...
ABSTRACT
Selection of materials for high-temperature geothermal wells follows oil and gas (O&G) standards and recommendations and the same applies for wellhead design, well design and drilling. Geothermal wells differ from O&G wells with higher temperatures and often low pH level that enhance effects of non-condensable gases such as H2S and CO2. Th...
Harsh geothermal fluid demands corrosion resistant alloys (CRA's) instead of the traditional carbon steel as production casing in a geothermal well. Different CRA's were exposed in a batch autoclave of nickel-based alloy N10276. The different samples and purposes were coupons for weight loss measurements, rod samples for interphase reaction examina...
Nickel additions to low alloy steels improve mechanical and technological properties. However, Part 2 of ISO Standard 15156 limits the nickel content to a maximum of 1 wt% in oil and gas environments containing H2S because of controversial concerns regarding sulfide stress cracking. The objective of this work was to investigate the effect of nickel...
As a part of a materials selection evaluation, 22%Cr and 25%Cr duplex stainless steel (22%Cr/25%Cr) were corrosion tested in an environment simulating produced water with small amounts of oxygen. Two 28-days exposure tests were performed with stationary specimens in glass cells containing synthetic produced water. Both materials were present in bot...
A carbon-polymer composite coating on stainless steel 316L substrates was investigated for the use as bipolar plate material for polymer electrolyte membrane fuel cells. The coating consisted of 45 vol% graphite, 5 vol% carbon black and 50 vol% epoxy binder. The coating was applied by a spraying technique followed by hot-pressing while the binder c...
