A Comparison of Actual and Estimated Long-Term Corrosion Rates of Mild Steel in Seawater

2008 ◽  
pp. 197-197-10
Author(s):  
FD Bogar ◽  
MH Peterson
Keyword(s):  
Mild Steel ◽  
Corrosion Rates

Pseudomonas putida RSS biopassivation of mild steel for long term corrosion inhibition

2019 ◽  
Vol 137 ◽  
pp. 59-67 ◽  
Author(s):  
M.S. Suma ◽  
Rubina Basheer ◽  
B.R. Sreelekshmy ◽  
V. Vipinlal ◽  
M. Ameen Sha ◽  
...  
Keyword(s):  
Mild Steel ◽  
Pseudomonas Putida ◽  
Corrosion Inhibition

Spent Fuel Corrosion Behavior in Salt Solution in the Presence of Hydrogen Overpressure

2001 ◽  
Author(s):  
Andreas Loida ◽  
Bernd Grambow ◽  
Horst Geckeis
Keyword(s):  
Gas Phase ◽  
Spent Fuel ◽  
Nacl Solution ◽  
Release Rates ◽  
Corrosion Rates ◽  
The Matrix ◽  
Matrix Bound ◽  
Safety Assessments ◽  
Container Material

Abstract The simultaneous corrosion of spent fuel and Fe-based container material is characterized by the formation of large amounts of hydrogen, which control the composition of the gas phase. Various experimental data indicate that the matrix dissolution rate and the release rates of important radionuclides decrease, if the H2 overpressure increases. To quantify to what extent the hydrogen overpressure may counteract radiolysis enhanced matrix dissolution rates, and to take credit from the effect of hydrogen overpressure in long-term safety assessments of the repository, a detailed experimental investigation has been initiated. High burnup spent fuel is being corroded under anoxic conditions in the absence of carbonate in 5m NaCl solution under an external H2 overpressure of 3.3 bar. This pressure is in the same range as observed in a long-term test using spent fuel and Fe-powder. Results obtained after 117 days of testing show that due to constant or decreasing concentrations of Sr and other matrix bound radionuclides, corrosion rates were not measurable indicating a stop of matrix dissolution or very low long-term rates. Grain boundary release of Cs and fission gases was found to continue under hydrogen overpressure. Compared to tests in the absence of hydrogen solution concentrations decreased by about ca. 1.5 orders of magnitude for U (10−8 M), Am, Eu (10−10 M), whereas the decrease of Np (3×10−10 M), Tc (5×10−9 M) and Pu (4×10−9 M) concentrations was found to be less significant.

Corrosion of Metals by Liquid Bismuth-Tellurium Solutions

CORROSION ◽  
1973 ◽  
Vol 29 (2) ◽  
pp. 75-84 ◽  
Author(s):  
W. R. KANNE
Keyword(s):  
Stainless Steels ◽  
Corrosion Rates ◽  
Liquid Bismuth

Abstract Corrosion of candidate materials of construction for stills to extract radioactive polonium-210 from bismuth by distillation at temperatures of 450 to 950 C (842 to 1742 F) was evaluated. Tellurium, being chemically similar to polonium, was used as a nonradioactive stand-in for polonium. Tantalum appears to be the most satisfactory material from the standpoint of long term corrosion and fabricability. Tantalum was corroded at rates up to 2 × 10−5 in/hr during the initial 100 to 200 hours exposure; the rate decreased to below 2 × 10−6 in/hr after 400 hours for concentrations of tellurium in bismuth of less than 30%. Graphite was not attacked chemically, but was penetrated through pores. TZM alloy exhibited average corrosion rates of less than 6 × 10−6 in/hr during 500 hours exposure in less than 20% tellurium in bismuth, but corroded rapidly (7.2 × 10−5 in/hr) in 50% tellurium. The stainless steels, particularly Type 430, might be used to approximately 550 K (276.85 C); but corrosion rates increased above 3 × 10−5 in/hr for a 15% solution of tellurium in bismuth at higher temperatures.

scholarly journals Mössbauer Spectroscopic Study of Rust Formed on a Weathering Steel and a Mild Steel Exposed for a Long Term in an Industrial Environment

2002 ◽  
Vol 43 (4) ◽  
pp. 694-703 ◽  
Author(s):  
Takayuki Kamimura ◽  
Saburo Nasu ◽  
Takashi Tazaki ◽  
Kaori Kuzushita ◽  
Shotaro Morimoto
Keyword(s):  
Mild Steel ◽  
Spectroscopic Study ◽  
Weathering Steel ◽  
Industrial Environment

Studies of Galvanic Corrosion Couples in Liquid Fluorine

CORROSION ◽  
1968 ◽  
Vol 24 (12) ◽  
pp. 418-421 ◽  
Author(s):  
S. M. TOY ◽  
W. D. ENGLISH ◽  
W. E. CRANE
Keyword(s):  
Galvanic Corrosion ◽  
Reference Electrode ◽  
Metals And Alloys ◽  
Corrosion Rates ◽  
Long Term Storage ◽  
Electrode Potentials ◽  
General Arrangement ◽  
Term Storage

Abstract Galvanic corrosion couples of several metals and alloys were tested in liquid fluorine at −320 F (−196 C), and the corrosion rates of the alloys were determined. A relative galvanic corrosion series, based on the rates, was developed as a guide for selecting materials for missile components exposed to fluorine containing propellants for long term storage. Electrode potentials of Al 1100 and copper versus a platinum reference electrode in liquid fluorine verify the general arrangement of the galvanic series. Evidence of pitting was found on Al 2014-T6 and silver coupons exposed to liquid fluorine.

Chemical Corrosion of Cogema Glass R7T7 in High Saline Brines

1987 ◽  
Vol 112 ◽  
Author(s):  
Werner Lutze ◽  
R. Müller ◽  
W. Montserrat
Keyword(s):  
Transport Process ◽  
Salt Dome ◽  
Deionized Water ◽  
Federal Republic Of Germany ◽  
Chemical Corrosion ◽  
Dome Formation ◽  
Corrosion Rates ◽  
Different Temperatures ◽  
Term Data

AbstractIn the Federal Republic of Germany, the salt dome formation at Gorleben has been selected as a possible site for final disposal of HLW. The waste form will be borosilicate glass, e. g. the French Cogema glass R7T7. The corrosion of this glass has been investigated in three reference salt brines (brine 1: high Mg, brine 2: Ca and Mg, and brine 3: high Na) at three different temperatures, 110°, 150°, and 190°C and three S/V ratios, 10, 100, and 1000m−1. Results are presented for brine 1 and are compared qualitatively with those obtained for the other brines. As in deionized water and pure NaCl, the corrosion rate decreases when silica saturation is approached, but the reaction does not cease. The data after silica saturation were used to calculate upper limiting, i. e. time-independent corrosion rates. The long-term data indicate that a transport process through the growing surface layer may become rate controlling, and that the rate may further decrease after silica saturation.

Effect of pH on Oxygen Corrosion At Elevated Pressures

CORROSION ◽  
1960 ◽  
Vol 16 (6) ◽  
pp. 260t-264t ◽  
Author(s):  
O. L. RIGGS ◽  
J. D. SUDBURY ◽  
MERLE HUTCHISON
Keyword(s):  
Mild Steel ◽  
Oxygen Pressure ◽  
Pressure Range ◽  
Room Temperature ◽  
Accelerated Corrosion ◽  
Corrosion Rates ◽  
Elevated Pressures ◽  
Decreasing Ph ◽  
Ph Range ◽  
Mechanism Of Growth

Abstract A summary study of oxygen corrosion of mild steel in brine is presented. Corrosion rates were determined for oxygen pressures ranging from atmospheric to 515 psia and over a pH range of 1-13.5. All tests were conducted at room temperature (24 C). It is shown that corrosion rates are generally increased with increasing oxygen pressure and decreasing pH; however, when tests exceeded 6 hours duration, an accelerated corrosion developed over the pH range 8–12. An unusual filamentary type corrosion product develops and grows in the 300–500 psi oxygen pressure range in pH 12 system. The identification and proposed mechanism of growth are given. 3.4.6

scholarly journals Operation corrosion test of austenitic steel bends for supercritical coal boilers

2016 ◽  
Vol 60 (1) ◽  
pp. 21-27
Author(s):  
J. Cizner ◽  
J. Hruška ◽  
J. Mlnařík
Keyword(s):  
Austenitic Steel ◽  
Brown Coal ◽  
Coal Combustion ◽  
Corrosion Test ◽  
Sample Surface ◽  
Corrosion Rates ◽  
Annealed State ◽  
Operation Conditions ◽  
Detailed Assessment

Abstract Corrosion tests of both annealed and not annealed bends of HR3C and S304H steels in operation conditions of black and brown coal combustion boilers in EPRU and EDE. After a long-term exposure, the samples were assessed gravimetrically and metallographically. The comparison of annealed and unannealed states showed higher corrosion rates in the annealed state; corrosion of the sample surface did not essentially differ for compression and tensile parts of the beams. Detailed assessment of both steels is described in detail in this study.

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