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The wear of the cobalt-based hardfacing alloy Stellite grade 6, which is used for part of the latch arms of control rod drive mechanisms (CRDM) in pressurized water nuclear reactors, has been studied. The investigations were based on field experience (nondestructive inspection) and on metallurgical examinations of specimens from laboratory studies.A wear mechanism based on tribocorrosion was found...
Organic acids might contribute to corrosion phenomena observed in steam generators of nuclear power systems. Effects of organic acids on the corrosion behaviour of alloys for heat transfer tubes have so far not been investigated in detail. A research programme has, therefore, been launched, on the role of organic acids as regards dissolution and passivation of nickel and its alloys. The following...
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