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A brief overview of ASTM G48 – "Standard Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels and Related Alloys by Use of Ferric Chloride Solution" is used for corrosion testing in the metals industry.
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Supercritical water-cooled reactor (SCWR) is an innovative Generation IV nuclear reactor. Nickel-based alloys, such as UNS N06625, UNS R20033 and UNS N07214 alloys, are selected for the fuel cladding. Knowledge gaps exist as regards their use for the fuel cladding in the SCWR. This paper introduces laboratory results on corrosion and stress corrosion cracking (SCC) of the nickel-based alloys.
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.
Mechanical properties and microstructure of Nb-Ta-Re, Nb-Re, Nb-Pd, and Nb-Pt alloys were studied by nano-indentation measurements and X-ray diffraction. Corrosion behavior was compared by electrochemical methods, including open circuit potential measurement, potentiodynamic, and electrochemical impedance spectroscopy.
Dental implants are exposed to a wide range of pH values of saliva and different concentrations of fluoride. In this study, the effects of fluoride concentration and pH value on the corrosion behavior of Nb-10Ta-1Re and Ti-6Al-4V alloys in artificial saliva at 37°C were investigated by electrochemical measurements.
The objective of this research was to determine the resistance of frequently used sealing materials in fuels and heating oil with and without admixtures such as E10, diesel fuel with 5 % biodiesel, non-aged and 2 year aged B10 (heating oil with 10 % biodiesel), pure diesel, standard heating oil and premium grade fuel Super plus at 20 °C, 40 °C and 70 °C.
The effect of Tungsten (W) and Molybdenum (Mo) on the corrosion behavior of low alloy steels exposed to acid humidity corrosion environment containing O2, H2S, and CO2 was investigated using weight loss, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and electrochemical measurements.
Lean duplex stainless steel (LDSS) can provide mechanical properties similar to that of duplex stainless steel (DSS) and is less expensive. The focus of this work was to assess the stress corrosion cracking (SCC) and SCC susceptibility of DSS and LDSS in chloride-containing sour water conditions.
Crevice corrosion affects the integrity of stainless steels used in oil and gas components exposed to seawater. In this work, the crevice corrosion resistance of a 22-Cr duplex and a 25-Cr super duplex stainless steels (UNS S31803 and UNS S32750, respectively) were investigated.
This paper presents an expanded laboratory test database on critical corrosion modes for UNS R55400 pipe exposed to relevant oilfield production environments which include sour well fluid brines, a heavy chloride/bromide brine well completion fluid, injected methanol, organic acid- and HCl-based well acidizing solutions, and seawater.
Oxidation behavior of a commercial, cast Ni-base superalloy was studied in air-SO2 mixture, simulating combustion gases from high sulfur containing fuels. Experiments at 1050°C for up to 500 hours duration. The studied alloy was characterized with a number of analytical methods including SEM / EDX and GDOES after different oxidation times.