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In a 1998 study, costs for corrosion in USA were estimated to be about 276 billion US-$. One way to reduce this gigantic amount of money is to use modern stainless steels and nickel alloys with excellent resistance to various forms of corrosion in corrosive environments like seawater, brines, oil and sour gas wells.
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This paper will be dedicated to the corrosion resistance of roll-bonded UNS N06625 and N08825 clad materials.
A 3-week corrosion testing of UNS N06625 was conducted in supercritical fluid at 350°C and 10 bars to simulate a geothermal environment where other alloys had been tested. Some localized corrosion occurred at a rate similar to previous results.
Supercritical water gasification (SCWG) is a promising thermochemical conversion technology in which supercritical water is used as the medium to convert different types of wet biomass (such as wastewater sludge, food waste or microalgae) and even crude bio-oils into hydrogenrich syngas without the need of costive pre-drying process.1 During typical SCWG conversion at temperature and pressure above the critical point of water (i.e., 374℃ and 22.1 MPa), alkali metal/metal oxide catalysts, carbon-based catalysts and Ni- or Fe-based catalysts are introduced to significantly improve the conversion efficiency on H2 production.2
There is an increasing interest in substituting nonrenewable fossil fuels with clean and renewable energy resources due to the concerns on the greenhouse gas emissions and the depleting fossil resources. Biomass is a renewable resource derived from living organism and/or their byproducts. For example, some agriculture or forestry wastes (like cornstalk or wood sawdust), industrial wastes (such as black liquor), cattle manure from animal husbandry, and even sewage from our daily life usage can be used for bioenergy production.
Alloy 625 (UNS N06625) is an austenitic solid solution strengthened nickel-chromium-molybdenum alloy containing niobium. The high alloy content of alloy 625 enables it to withstand a wide variety of severe corrosive environments. In mild environments, such as ambient atmosphere, fresh and seawater, neutral salts and alkaline media, there is almost no attack.