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Zairyo-to-Kankyo
Vol. 58 (2009), No. 9

Zairyo-to-Kankyo Vol. 58 (2009), No. 9

ONLINE ISSN:	1881-9664
PRINT ISSN:	0917-0480
Publisher:	Japan Society of Corrosion Engineering

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20 Jun. (Last 30 Days)

Zairyo-to-Kankyo Vol. 58 (2009), No. 9

How to Learn Corrosion, How to Teach Corrosion

Yoshiro Kuriki

pp. 321-321

DOI:

10.3323/jcorr.58.321

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Article Title

How to Learn Corrosion, How to Teach Corrosion

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Ris

Formation of Basic Copper Sulfates and Chlorides during Atmospheric Copper Corrosion

Masamitsu Watanabe, Morihiko Matsumoto, Nobuo Kuwaki, Jun’ichi Sakai

pp. 328-334

DOI:

10.3323/jcorr.58.328

Abstract

Basic copper sulfates and copper chlorides are known to form in addition to cuprite during outdoor atmospheric corrosion of copper. Among the basic copper sulfates, posnjakite is reported to form in the early stage and then transform into brochantite when during the course of exposure. In contrast, copper chlorides, such as atacamite and nantokite, are reported not to form in the early stage. Using thermodynamic data at 298 K, we have calculated the conditions under which basic copper sulfates and chlorides are deposited on the surface of exposed copper. For posnjakite, the minimum sulfate ion concentration needed for deposition was calculated to be 6.3×10⁻⁴ M given a cupric ion concentration of 1×10⁻⁶ M and a pH of 7. The posnjakite formation found on copper exposed in summer in urban areas is reasonably explained by the observation that the sulfate ion concentration in the surface electrolyte exceeded the minimum concentration. Although the sulfate ion concentration in the surface electrolyte exceeded the minimum concentration during winter, there was no evident posnjakite formation. This is explained by the low relative humidity and the short ‘time of wetness’. For atacamite, the minimum chloride ion concentration needed for deposition was calculated to be 2.5×10⁻² M given a cupric ion concentration of 1×10⁻⁶ M and a pH of 7. Although the chloride ion concentration in the surface electrolyte on copper exposed in urban areas exceeded the minimum concentration needed to deposit atacamite, peaks originating from this phase were not observed. A possible explanation for this is the slow formation rate of atacamite. Posnjakite depostition was found to be predominant, particularly in winter. This is reasonable give that posnjakite is more stable than atacamite. This also explains why there was a lack of atacamite formation in the early stage of the exposure.

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Microbiologically Influenced Corrosion of Carbon Steel in Aqueous Natural Gas Plant

Takuya Handa, Sayaka Ohno, Momoko Moteki, Kazuhiko Miyanaga, Yasunori Tanji

pp. 335-340

DOI:

10.3323/jcorr.58.335

Abstract

In the aqueous natural gas plants, the injection well was corroded after a few years because of sulfuric acid addition to adjust pH for iodine separation. To identify the corrosion factor, microbial communities and corrosion in the plants were compared using sulfuric acid or hydrochloric acid as a pH conditioner. Genus Pseudomonas and methanogenic archaea were dominant in 16S rRNA gene library constructed from production water. The dominant SRB species were different depending on the pH conditioner. According to DAPI staining and DGGE analysis, the cell concentration increased and bacterial community changed. It was assumed that this phenomenon occurred due to contamination by microorganisms from the surrounding environment. The three month corrosion study showed that the general corrosion rate of carbon steel coupons in the injection tank using sulfuric acid as a pH conditioner was four times higher and the biofilm weight was one and a half times bigger than the injection tank using hydrochloric acid. One possible reason is that hydrogen sulfide produced by SRB corroded carbon steel. However, the pitting corrosion rate was the highest in the receiving tank which used no acid. This result indicated that metal surface corrosion is caused a mechanism which includes an oxygen concentration cell formed by the heterogeneously-attached biofilm.

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Microbiologically Influenced Corrosion of Carbon Steel in Aqueous Natural Gas Plant

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Zairyo-to-Kankyo Vol. 58 (2009), No. 9

Keyword Ranking

blast furnace

electoromagnetic

melt

mg treatment inclusion

ステンレス鋼 ti-ni

electoromagnetic segregation

magnethydrodynamics

technol. plast

thermo dynamics and kinetics of coal gasification in a liquid iron bath

岡本

Zairyo-to-Kankyo Vol. 58 (2009), No. 9

How to Learn Corrosion, How to Teach Corrosion

Share it with SNS

Formation of Basic Copper Sulfates and Chlorides during Atmospheric Copper Corrosion

Share it with SNS

Microbiologically Influenced Corrosion of Carbon Steel in Aqueous Natural Gas Plant

Share it with SNS

Article Access Ranking

Wettability of CaS Against Molten Iron at 1873 K

Perspectives on the Promising Pathways to Zero Carbon Emissions in the Steel Industry toward 2050

New Electromagnetic Flow Control System for Optimization of Molten Steel Flow in Continuous Casting Mold

Preface to the Special Issue on “Challenges to Comprehension for Phenomena of Degradation, Softening, and Melting of Raw Materials in Hydrogen-enriched Ironmaking Process”

Effect of Al in the coating layer of Zn-coated steel sheet on Zn oxidation during hot-stamping heating

Growth, Removal, and Agglomeration of Various Type of Oxide Inclusions in Molten Steel

Investigation of the Effects of Mechanical Properties and Carbon Content on Cold Cracking in Laser Welds of High-strength Thin Steel Sheets

Effect of Water on the Non-Isothermal Hydrogen-Water Reduction of Industrial Hematite Pellets

Low Temperature Reduction Disintegration Mechanism of Self-fluxing Pellet under High Hydrogen Condition of Blast Furnace at 500°C

Effects of alloying-element addition on hydrogen diffusion and hydrogen absorption in Ni

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