Hydrazine-Dependency of Low-Alloy Steel Flow-Accelerated Corrosion in a Deoxygenated Solution at 250°C

Abstract:

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In the nuclear power plants (NPPs), wall thinning of the piping materials is generally caused by a flow-accelerated corrosion (FAC) and leads to a rupture with no warning unless it is detected and repaired in a timely manner. To reduce the FAC, it is better to use low-alloy steels, such as 1Cr-½Mo and 2¼Cr-1Mo, having higher FAC-resistance than carbon steel. Meanwhile, in the secondary water chemistry at the NPPs in Korea, hydrazine concentration is maintained within the range of 100~150 ppb. For applying these low-alloys to a piping material, we investigated the influence of hydrazine concentration on their FAC. An experiment was carried out at pH25°C of 9 controlled with ammonia in a deoxygenated aqueous solution containing 0~250 ppb-hydrazine by using a FAC test loop at 250°C for 300 hours. Experimental weight loss showed a hydrazine concentration dependency of the FAC in this concentration range, giving minimum at 150 ppb.

Info:

Periodical:

Advanced Materials Research (Volumes 26-28)

Edited by:

Young Won Chang, Nack J. Kim and Chong Soo Lee

Pages:

1133-1136

Citation:

K. W. Sung et al., "Hydrazine-Dependency of Low-Alloy Steel Flow-Accelerated Corrosion in a Deoxygenated Solution at 250°C", Advanced Materials Research, Vols. 26-28, pp. 1133-1136, 2007

Online since:

October 2007

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$38.00

[1] Accident at the Kansai Electric's Mihama-3 NPS, JAIF Focus, Japan Atomic Industrial Forum, Inc., August 10, (2004).

[2] O. De. Bouvier, Program on the CIROCO loop - Influence of Hydrazine on FAC in the presence of Oxygen - Program for Chrome, presented at CHUG meeting, Portland, June 17-18, (1999).

[3] O. De. Bouvier, Program on the CIROCO loop - Influence of Hydrazine on FAC in the presence of Oxygen - Program for Chrome, presented at CHUG meeting, Portland, June 17-18, (1999).

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