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This paper discusses the development and optimization of a procedure for evaluating crevice corrosion repassivation by the cooling of corroding Ni-Cr-Mo alloys.
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Alloys UNS N06600, N06690 and N08800 are used for steam generator tubes. Pitting corrosion was studied in 0.1 to 1 M chloride solutions with additions of thiosulfate ranging from 10-4 M to 10-2 M, at room temperature. The alloys were tested in solution annealed and thermally aged conditions.
The effect of high performance concrete on the corrosion behavior of steel bar in reinforced concrete (RC) specimens are experimentally investigated. Concrete specimens with the addition of fly ash, silica fume, and calcium nitrite were fabricated and tested for over 23 years.
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.
Key agents that cause stress corrosion cracking on API 5L X70 steel in anhydrous fuel ethanol by statistical analysis of chemical analyses data of anhydrous-ethanol samples and data from previous stress corrosion cracking tests.
This work aims at comparing a performance of the UNS(1) S32304 lean-duplex stainless steel rebars in electrical contact with carbon steel rebars, both embedded in concrete subjected to a chloride ion contamination.
A606-04 steel panels (same composition as A588 weathering steel) were exposed at 30 sites in southeast Florida for periods of up to 3.5 years. The distances of the sites from the east coastline ranged from 0.1 mi to 21 mi.
Severe leakage on a high percentage of the plug gaskets on a high alloy air cooled heat exchanger during or shortly after initial startup has occurred in only a small percentage of air coolers, but has resulted in costly replacements and unit shutdowns. These problems have occurred with 304L stainless steel (SS), 316L SS and Nickel 200 gaskets, although each material also has many successful applications. The contributing factors to the leakage has included corrosion, galling and/or inadequate manufacturing steps. This paper summarizes a number of case histories and gives their root causes and solutions. The pros and cons of various gasket materials and design options are discussed, along with a proposal for additional requirements to be added to industry standards which would minimize the risks of these problems.
Concrete is the second most common man-made material after potable water, yet it is a complex material that is poorly understood. Steel reinforcement is added to improve the concrete's tensile strength and ductility and is initially protected by the high concrete pH and depth of cover concrete. Eventually, due to the ingress of deleterious ions, lowering of the pH from carbonation, or electrical potential changes within the steel, corrosion will occur.
This paper provides an overview of the electrochemical passivation process, history of the BurlingtonSkyway, description of the installation process, treatment results and up to 30 years of monitoringresults for the structure.
This paper presents results of multiple test programs that have been performed to determine the effectiveness of recyclable encapsulated abrasive media to remove chlorides during surface preparation. Tests published in 2002 concluded that this technology consistently achieves significant reductions of chloride levels in comparison to those achieved with conventional abrasive blasting.
This work is aimed at determining the viability of oxygen-free copper as an engineering barrier of high-level radioactive waste containers.