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A previous paper presented by the authors at SSPC 2015 demonstrated the futility and folly of attempting to use accelerated corrosion testing as a tool for predicting real world corrosion performance. The effect of corrosion was shown to be governed by the type of ions and the concentration of oxygen in the corrosion environment. By understanding these two factors, accelerated corrosion testing can, however, be used as an indicator of performance which may be encountered in the real world.
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Marine coating systems installed aboard commercial and military vessels are exposed to extremely aggressive environmental conditions during maritime operation. A key element in prolonging the useful life of any ship, both commercial and military, lies in the selection and installation of cost-effective corrosion control methods and materials at newbuild.
Hydrogen embrittlement is a process that results in a decrease of the ductility of metals as a result of absorbed hydrogen. Advanced high-strength steels used in the automotive industry are materials that are considered prone to hydrogen embrittlement. Hydrogen can enter the material during steelmaking or processing steps, such as pickling, cleaning, phosphating, and electroplating.
Corrosive gases either present in the environment or generated as byproducts of manufacturing are posing an elevated threat across the pulp and paper industries. As the presence of computer processes and automated control systems are increasing within said industries in order to streamline manufacturing and mitigate costs corrosive gases pose a crucial concern.Electrical and electronic equipment has become increasingly sophisticated and sensitive where the direct and indirect costs of failure can be significant. However with the installation of gas phase monitoring and filtration systems the risk of corrosive damage to electronic equipment can be dramatically reduced.Through this presentation we will explore methods for identification and quantification of typical gases responsible for corrosion of electrical and electronic equipment within the pulp and paper industry. We will also present a basic introduction to filtration technologies readily available to reduce the threat of corrosion of control systems.
Utility scale solar array construction projects continue to grow in number annually. Large open spaces with consistent UV exposure often make excellent locations for solar array fields, however these sites do not always provide ideal soil conditions for the steel H beam pile supports which are embedded into the ground.
The corrosion behavior of mild steel in two Brønsted acid ionic liquids (BAILs) with different cationic centers triethylammonium and pyridinium-type was electrochemically investigated in non-aqueous and aqueous conditions at 25°C.A relatively wide passivation region (0-2.1 V) was clearly observed for mild steel and a lower corrosion rate was observed for both BAILs at 25°C. The Brønsted acidity of these BAILs is not proportional to corrosion rate of the mild steel therein. In addition the different adsorption centers on each BAIL molecule namely their sulfonate group along with either a quaternary ammonium or pyridinium structural motif means they can possess different inhibiting characteristics as well as modes of adsorption at metal surfaces.Based on these electrochemical results the inhibition ability of both BAILs in 0.5 M HCl solution against acid corrosion of mild steel was investigated at various concentrations at 25°C using gravimetric measurements. The pyridinium-type sulfonate-functionalized IL did not contribute to corrosion protection of the steel surface while the triethylammonium-type sulfonate-functionalized IL had an inhibition efficiency of ca. 40%.Keywords: Corrosion Inhibition HCl BAILs Mild Steel
The design packages are being optimized for the construction of gas transmission lines associated with nine (9) Gas Compression Plants (GCPs) and six (6) Liquid Separation Stations (LSSs). The objective of this study was to assess the service corrosivity of all gas transmission lines associated with these GCPs and LSSs. The results of the study will assist in selecting a cost-effective and efficient corrosion management program in terms of both materials and corrosion control options. To address this objective, the study involved conducting laboratory tests simulating the conditions in these lines. Three types of corrosion attacks were investigated, namely, general corrosion, pitting corrosion, and gas phase corrosion.
The aggressiveness of the atmospheric environment can be assessed by measurement of climatic and pollution factors, or by determination of the corrosion rates of metals and coatings. The latter is a low cost technique which has traditionally been employed at single isolated sites with different types of environments. This approach does not, however, adequately portray the levels of corrosivity across a city or region which can vary by an order of magnitude. A technique has been devised at the Commonwealth Scientific and Industrial Research Organization (CSIRO) in which specimens are exposed across a grid of contiguous sites and the results computer contoured to generate corrosivity maps. A new method of h hyperbolic interpolation of the data has been developed to model corrosivity approaching the coastline. The paper presents results from surveys around an industrial point source of S02, conducted over two different periods. The technique of corrosivity mapping was demonstrated to be a sensitive indicator of localized zones of enhanced corrosion, and the two maps reflected changed conditions in the plant's operation in the two periods. The paper also discusses corrosion mapping in countries other than Australia and examines the costs of such exercises and the potential savings they can provide.
When WIT Inc. was asked to rehabilitate the Alta Vista Standpipe, the first order of business would be to conduct a comprehensive tank evaluation in order to determine the overall condition, and also, to compile an inventory of deficiencies, repairs and upgrade objectives so that the project manual for the bid phase would include all necessary work to bring the tank to current AWWA standards.
This presentation will outline the results and conclusions of a number of years of testing and experience in surface preparation for high-performance coatings. Testing has shown that there are several important variables that are not routinely monitored and controlled on most coating projects. The pertinent variables will be identified, and guidance will be provided on appropriate treatment of the variables to achieve the maximum results from the chosen coating.
Corrosion under insulation (CUI) is a form of corrosion resulting from water trapped under insulation. CUI is a main asset integrity threat to many processing facilities. CUI damage is not readily identifiable and hidden underneath the insulation.