Turnbull, A; Zhou, S (2005) Impact of water chemistry transients on pitting and stress corrosion cracking of a steam turbine disc steel. NPL Report. DEPC-MPE 013

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Abstract

The impact of environmental transients on pitting and stress corrosion cracking of a steam turbine disc steel has been evaluated. The testing represents an attempt to simulate the water chemistry aspects of two-shifting in power plant but with the specimens held under constant stress. With aerated pure water off-load and deaerated 300 ppb Cl- + 300 ppb SO42- solution on-load, enhanced pit and stress corrosion crack development compared with continuous on-load or off-load exposure was observed. The key factor is considered to be sustainment of an electrochemical driving force for pitting and stress corrosion cracking on-load despite the absence of oxygen.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	DEPC-MPE 013
Subjects:	Advanced Materials Advanced Materials > Corrosion
Last Modified:	02 Feb 2018 13:16
URI:	http://eprintspublications.npl.co.uk/id/eprint/3351

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