CORROSION OF IRON-BASE ALLOYS VERSUS ALTERNATE MATERIALS IN GEOTHERMAL BRINES (Interim Report - Period Ending October 1977)

Shannon, D.W.

doi:10.2172/1107614

Cited by 15 publications

(15 citation statements)

References 1 publication

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“…In regard to the operation of a geothermal power plant, the steel grade API L80 shows better corrosion resistance at temperatures of 200 • C, which can be found nearby the bottom of the boreholes as shown in Figure 1, than those at 100 • C. This is because iron oxides are stable at 200 • C, leading to the formation of a protective scale [57]. However, the temperature in the reservoir might drop over the lifetime of the power plant [9], and, as a consequence, the entire system might be jeopardized.…”

Section: Discussionmentioning

confidence: 99%

Corrosion Behaviour of L80 Steel Grade in Geothermal Power Plants in Switzerland

Vitaller

Angst

Elsener

2019

Metals

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In Switzerland, deep geothermal energy can give a promising contribution to the future energy scenario. However, the expertise in operational issues of deep geothermal power plants is limited, and technical challenges, such as corrosion, are a determining factor for their reliable and long-term operation. In this work, two representative fluids of optimal geothermal conditions in Switzerland were studied. The corrosiveness of the solutions was assessed using two experimental setups that allow investigating the range of temperatures and pressures that apply to the reservoir and power plant conditions. The corrosion behaviour of API L80 steel was analyzed by means of electrochemical measurements (at 100 and 200 • C) and of gravimetric tests (at 100 • C). After the tests, the morphologies and composition of the corrosion products were obtained by scanning electron microscopy (SEM) coupled with energy dispersive X-Ray (EDX) and X-Ray diffraction (XRD). Results show that corrosion rates are significantly high at 100 • C in environments with a chloride concentration of around 600 mg/L and pH around 7. The corrosion products deposited on the metal surface mainly consist of magnetite and/or hematite that might potentially form a protective layer. This study gives a first insight of the potential corrosiveness of geothermal fluids in Switzerland.

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Section: Discussionmentioning

confidence: 99%

Corrosion Behaviour of L80 Steel Grade in Geothermal Power Plants in Switzerland

Vitaller

Angst

Elsener

2019

Metals

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“…Specific metals were eliminated because of poor corrosion resistance, high cost (e.g., precious metals), poor availability (e.g., rare earths), or inability to fabricate at temperatures compatible with waste cores, that is, below 1300°C (e.g., refractory metals). Zirconium is an exception and is a logical alternative to titanium because it has very similar corrosion Shannon 1977) and fabrication characteristics (Schwope 1961). However, titanium is generally more available and seems to be a somewhat better choice for corrosion resistance.…”

Section: Metalsmentioning

confidence: 99%

Survey of matrix materials for solidified radioactive high-level waste

Gurwell¹

1981

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Pacific Northwest Laboratory (PNL) has been investigating advanced waste forms, including matrix waste forms, that may provide a very high degree of stability under the most severe repository conditions. The purpose of this study was to recommend practical matrix materials for future development that most enhance the stability of the matrix waste forms. The functions of the matrix were reviewed. Desirable matrix material properties were discussed and listed relative to the matrix functions. Potential matrix materials were discussed and recommendations were made for future matrix development. Th1e matrix mechanically contains waste cores, reduces waste form temperatures, and is capable of providing a high-quality barrier to leach waters. High-quality barrier matrices that separate and individually encapsulate the waste cores are fabricated by powder fabrication methods, such as sintering, hot pressing, and hot isostatic pressing. Viable barrier materials are impermeable, extremely corrosion resistant, and mechanically strong. Three material classes potentially satisfy the requirements for a barrier matrix and are recommended for development: titanium, glass, and graphite. Polymers appear to be marginally adequate, and a more thorough engineering assessment of their potential should be made.

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“…A typical corrosion 2+ reaction is: Fe + Fe + 2e. Two of the most important cathodic reactions required to complete and sustain the electrochemical corrosion process are: 2H+ + 2e-+ H2 (gas) and O 2 + 2H2 + 4e-+ 40H- (Shannon 1977). This shows that the acidity (pH) and the oxygen content of the brine are extremely important in controlling the corrosion of carbon steels.…”

Section: Redox Reactionsmentioning

confidence: 99%

“…Naturally, CO 2 will be readily available in a CAES operation. The average corrosion rates of 10 carbon steels in 1% NaCl brines are plotted against pH in Figure 39 (Shannon 1977). It has been observed that the effects of dissolved CO 2 become less serious at elevated temperatures, e.g., 423°K to 523°K.…”

Section: Liquid Water Environmentmentioning

confidence: 99%

See 1 more Smart Citation

Potential petrophysical and chemical property alterations in a compressed air energy storage porous rock reservoir

Stottlemyre¹,

Erikson²,

Smith³

1979

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CORROSION OF IRON-BASE ALLOYS VERSUS ALTERNATE MATERIALS IN GEOTHERMAL BRINES (Interim Report - Period Ending October 1977)

Cited by 15 publications

References 1 publication

Corrosion Behaviour of L80 Steel Grade in Geothermal Power Plants in Switzerland

Corrosion Behaviour of L80 Steel Grade in Geothermal Power Plants in Switzerland

Survey of matrix materials for solidified radioactive high-level waste

Potential petrophysical and chemical property alterations in a compressed air energy storage porous rock reservoir

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