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Alloy composition, hardness and corrosion performance (ASTM B117 & potentiodynamic polarization) relative to the base aluminum alloys 6061 & 2070. The thermodynamically stable nanocrystalline aluminum alloys provide improved corrosion resistance.
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The work is mainly focused on the corrosion mechanism at low pH (>4) and the order of which the discontinuous and continuous intermetallic phases dissolve. Compositions of each phase, and the area ratio between intermetallic phases and the alpha matrix have been calculated as an average of 20 measurements.
Material selection for downhole applications has become more difficult as the number of alloys continues to increase. On one hand, stainless steels like 316 offer a relatively low initial cost, but are not suited for many severe applications or environments. Other alloys, like MP35N, offer considerable strength and corrosion resistance, but with a much higher cost. Thus, an attempt has been made to create an alloy that spans the considerable gap between the 300 series of stainless steels and the nickel or cobalt base alloys. The resulting 6% Mo stainless steels offered increased strength and corrosion resistance without a drastic cost increase. The first generation of superaustenitics still falls considerably short of the strength and corrosion resistance provided by established nickel or cobalt-base alloys. In an attempt to further bridge the remaining gap, a new superaustenitic stainless steel has been developed that maintains the attractive cost of the 6% Mo alloys, but enhances both corrosion resistance and strength to open up environments that were too severe for 6% Mo alloys. The development of this alloy along with localized corrosion resistance, qualification testing, and mechanical testing are discussed.
HISTORICAL DOCUMENT. Stress corrosion cracking (SCC) of carbon and low alloy steels in anhydrous ammonia service. To provide the corrosion engineer with the information to make decisions in individual applications.
HISTORICAL DOCUMENT.
This standard is intended for use by those specifying and installing thin metallic linings (nickel alloy, stainless steel, and titanium) in air pollution control and other process equipment subject to corrosive conditions.
Note: This document was originally published with errors in Table B1 , page 26. These identified errors are corrected. Errata sheet is included.
This technical report presents general information on materials commonly used for storing and handling commercial grades of aqueous hydrofluoric acid (AqHF) and anhydrous hydrogen fluoride (AHF). Some materials generally avoided are also discussed. This report is intended for end users, designers, and suppliers of equipment for use with AqHF and AHF. These include, among others, workers in process industry plants, engineering and construction designers, and suppliers of equipment such as pumps, valves, and hoses. This information is useful for initial design and for cost estimates of equipment to handle most commercial AqHF and AHF. The report addresses AqHF and AHF purchased to normal commercial quality that do not contain impurities liable to affect their inherent corrosion characteristics. Testing in the service environment typically indicates a material’s suitability for use with AqHF and AHF. This report does not include all materials that might be resistant and is not intended to limit the consideration and testing of other materials.