Determination and verification of required water chemistry limits. Volume 2. Isothermal capsule testing. Final report

Technical Report · Wed Aug 01 04:00:00 EDT 1984

OSTI ID:6594538

Fink, G C; Helyer, M H

Four series of high temperature (560/sup 0/F), isothermal capsule tests were performed in order to quantitatively measure and assess the corrosion behavior of various current and new steam generator materials in potentially aggressive environments. Alloy 600 capsules coupled to AISI 1018 carbon steel, A-508 low alloy steel or Types 405 and 409 stainless steels were used for these tests. The chemical environments selected simulated those which could occur within a steam generator following instances to condenser inleakage from three broad categories of cooling waters (acid forming - sea/brackish waters, neutral to caustic forming - fresh waters and cooling tower treated fresh water). Results of testing indicate: Pitting was the predominant type of corrosion for Alloy 600, A-508 low alloy steel, AISI 1018 carbon steel and Types 405, 409 stainless steel. AISI 1018 carbon steel experienced nonprotective magnetite formation in an acid chloride (0.2 M MgC1/sub 2/) environment. Non-protective magnetite formation was not experienced at 0.01 M MgC1/sub 2/. Type 409 stainless steel was found to be susceptible to intergranular attack in two of the environments tested (0.1 M SiO/sub 2/ plus 0.1 M NaC1, and cincentrated (10X) Arkansas cooling tower water pre-acidified to pH 6.5 with H/sub 2/SO/sub 4/). Type 405 stainless steel was not similarly affected. A-508 Class 2 low alloy steel demonstrated the greatest propensity for pitting followed by Type 405 stainless steel, AISI 1018 carbon steel and Type 409 stainless steel.

• Research Organization: Combustion Engineering, Inc., Windsor, CT (USA). Nuclear Power Systems
• OSTI ID: 6594538
• Report Number(s): EPRI-NP-3274-Vol.2; ON: TI85920016
• Country of Publication: United States
• Language: English

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