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A new corrosion inhibitor was developed and successfully applied in the field and the inhibition mechanism was investigated. In this paper, a combination of electrochemical and surface studies was used to shed light upon the corrosion inhibition mechanism.
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Distress (controlled surface breaks) was created on production samples of epoxy coated rebar and some were further subject to cathodic disbondment. Samples were cast in concrete and subjected to cyclic polarization and electrochemical impedance spectroscopy measurements.
This work will examine and document the conditions that influence the phenomena of H2S generation, and generate quantitative data on the H2S removal performance of the oil soluble fully dispersible transition metal chemistry based H2S scavenger product line.
Failure of a diffuser (with vanes, made from material P265GH) is investigated. The gas compressor was in service for over 10 years. The gas contained both CO2 and H2S. Relative humidity of the gas was 100 %. It was found that the diffuser was fractured in 3 locations.
Case histories will illustrate failures that occurred in components that were made of different brass alloys in water and steam systems. Recommendations will be made to mitigate the damage that occurred in each case.
Frequency scan fatigue crack growth rate tests were performed at a fixed stress intensity factor range to determine the effect of frequency in two different sour environments. Both sour environments had the same partial pressure of H2S (0.21psia) but different pH values.
Performance, cost, and safety drive the coatings industry. Safer and environmentally friendly coatings continue to be a hot topic of discussion globally; however, the adoption of greener coating technologies is slow, especially in the US. This could be attributed to many factors, but from the formulator's perspective, performance is key. Waterborne coatings have been used in architectural applications for decades, but typically these coatings are valued mostly for aesthetics, ease of use, and low cost.
Steel structures are often galvanized to ensure durability in harsh environments. However, on occasion, incidents of cracking have occurred in galvanized structures that appear to be induced during the galvanizing process. Such cracking incidences produce a significant cost to the industry, in that repair procedures are often necessary to eliminate any flaws present directly after galvanizing.
Resistance testing of low alloyed steel pipes to Hydrogen Induced Cracking (HIC) is performed according to NACE standard TM0284. Fitness-for-purpose testing, where the appropriate environment and pressures are selected, has been included.
Available fracture toughness (FT) test methodologies are reviewed in this publication to compare their details.
Galvanic primers have been found to be effective at reducing crack formation aluminum alloys. This paper will review primers that Luna has developed and explore a variety of commercially available ones.
The temperature dependence of the pitting corrosion resistance of a number of stainless steels, Fe-Cr-Ni and Fe-Cr-Ni-Mo materials in a series of high-temperature high-pressure chloride solutions, with or without addition of various (inhibitive) anions: SO4=, HCO3-, PO43-, OH-, etc.