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Carbon steel is commonly used as a material for pipelines in oil and gas industry for facilities such as flowlines, down hole tubulars, transmission pipelines. Wide use of carbon steel is conventional due to its economic feasibility, however this kind of steel faces significant internal corrosion problems with corrosion rates reaching up to 10 mm/y if there is exclusion of protective methods. In oil and gas industry such carbon steel pipelines are utilized for transportation of hydrocarbons where they are simultaneously exposed to the co-generated acidic gases (carbon dioxide (CO2) and hydrogen sulphide (H2S)) and water.
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The progress of science and technology, and the large-scale construction of infrastructures, not only bring about challenges to cathodic protection (CP), but also provide new opportunities for CP technologies. Challenges and opportunities promote the development of the CP technologies. In recent years, CP technology has achieved great development particularly in the following four aspects: first, numerical simulation calculation technology of cathodic protection, which has made remarkable achievements in theoretical research and practical application; second, data remote monitoring technology of cathodic protection, which has improved the management level of cathodic protection system by combining wireless transmission system and GPRS network; third, great progress has been made in the aspects of AC and DC stray current corrosion mechanism, evaluation method and elimination technology; fourth, the development of photocathodic protection technology.
Offshore assets such as drilling rigs, production platforms, and wind turbines present challenges for corrosion prevention maintenance. The primary defense against atmospheric corrosion on structural steel in offshore saltwater environments is a protective coating system.
Several factors cause protective coatings to degrade rapidly: besides wearing and damage encountered in installation and use, ultraviolet light breaks down the organic resins and corrosive seawater causes under creep at any breaks in the coating. Maintenance coating for offshore atmospheric systems can therefore be necessary as early as the second year.
Often times, protective coatings for equipment and packages come as an afterthought; therefore, a Coatings Specialist is not always included in early purchasing discussions. Lack of the Coating Specialist participation in the preliminary workflow does not necessarily equate directly to a “bad outcome”, however there are fundamental details which, if highlighted early, can make a significant difference in the procurement process resulting in cost savings and competitive bids.
The nuclear waste disposal concept in Finland is based on a multi-barrier system where the spent nuclear fuel is disposed of in deep crystalline bedrock in copper canisters surrounded by clay buffer. The copper canisters should have lifetimes exceeding 100 000 years to prevent the release of radioactive nuclides to the environment. In anoxic water such as the ground water at the disposal site the corrosion of copper should be extremely slow. However microbial activity on the surface or in the vicinity of the copper canister can enhance corrosion in many different ways e.g. changing the pH or redox potential excretion of corrosive metabolites direct or indirect reduction or oxidation of corrosion products and formation of biofilms that create corrosive microenvironmentsIn this study microbially influenced corrosion (MIC) of copper was studied using electrochemical methods weight loss measurements and molecular biology methods in laboratory environment. The experiment was conducted under anoxic conditions in water simulating the groundwater of disposal site. Inoculations of sulfate reducing bacteria (SRB) acetogenic bacteria or methanogenic archaea enriched from the disposal site were added to the experiments. A sterilized abiotic environment was used as a reference environment.
Ehanced oil recovery working pressure can reach up to 500 bars and in case of sudden depressurization local temperature can decrease down to -60°C. The aim of this work is to evaluate fracture toughness of two nickel containing steels as an alternative material.
A two-year Federal Highway Administration (FHWA) in-house study was launched in November 2006 to evaluate various coating materials that may be applied as one-coat systems to steel bridges. A total of eight test materials plus two control systems, a 3-coat and a 2-coat, were applied over near-white steel test panels (SSPC-SP10). Their performance has been evaluated for 20 months using electrochemical impedance spectroscopy, surface failure characterizations, rust creepage at scribe, pull-off adhesion, and changes of color and gloss.
Widespread media coverage has made mold a concern for everyone from home and business owners to those in building construction. This presentation explains the facts and fiction of mold ― what it is, where it grows best and how to control it. The benefits of antimicrobial coatings are also explained.