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Information from inspection and analysis of electric resistance welded galvanized steel pipe after service in residential water systems has resulted in a compilation of observations concerning the development and severity of corrosion leading to failure.
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Four low carbon steels with different Cr and Cu concentrations were prepared to investigate the effect of alloying elements on their corrosion behavior in 3.5% NaCl solution diluted hydrochloric acid and dilute sulphuric acid (pH=1.4-1.5) respectively. Electrochemical measurement and immersion test at room temperature characterized the corrosion behavior and evaluated the corrosion rate.
To investigate the role of Cr and Cu in steels in different solutions, four kinds of low carbon steel with different Cr and Cu concentrations were prepared to investigate the effect of alloying elements on their corrosion behavior. Solutions of 3.5 wt.% NaCl, diluted hydrochloric acid and diluted sulphuric acid (pH=1.4-1.5) were used.
It has been shown that when calcium and phosphate, used with an oxidizing agent that the two inhibiting mechanisms, calcium phosphate and azole, compete for the surface. By identifying the surface chemistry, new inhibitors were developed to target surface chemistry of yellow metals.
This study demonstrates that the mechanisms of microbiologically influenced corrosion (MIC) by Desulfovibrio vulgaris, a sulfate reducing bacterium (SRB), against X65 carbon steel and pure copper belong to two different types of MIC.
An advanced material of nickel-based alloy has been developed for Oil Country Tubular Goods (OCTG ) to be applied in sour conditions to injection of seawater into wells for enhanced oil and gas recovery.
An experimental method is described for the electrochemical and visual monitoring of erosion corrosion of copper and copper-nickel alloys in a synthetic sea water environment. An impinging jet cell was designed to accommodate electrochemical instrumentation and video microscopy equipment. A combination of electrochemical techniques includlng corrosion potential monitoring and impedance spectroscopy are utilized.
Antifouling coatings are a benefit to the environment because they reduce vessel drag which can increase fuel usage by as much as 86% and reduce the hull transport of nonindigenous species which may account for up to 70% of invertebrate invasive species in coastal waters. Copper-based antifouling coatings are used on over 90% of vessels in the world that have biofouling control coatings on their hulls.
This work is aimed at determining the viability of oxygen-free copper as an engineering barrier of high-level radioactive waste containers.
In this study, the effect of Mo, Cu and W contents in stainless steels on both NAC and PTA SCC resistance are investigated. The purpose was to optimize a proprietary version of UNS S34751 (TP347LN) with excellent PTA SCC resistance.
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.