标准编号：ISO 17918:2015
中文名称：金属和合金的腐蚀 铜合金和灰口铸铁通过目视检查组件和硬度测量对选择性腐蚀的评估
英文名称：Corrosion of metals and alloys — Evaluation of selective corrosion of Cu alloys and grey cast iron for power plant components by visual inspection and hardness measurement
发布日期：2015-07
标准范围
This International Standard specifies procedures of on-site detection and evaluation in order to determinethe effects of material deterioration such as material loss from the components and structures that aresensitive to selective corrosion in industrial facilities, including nuclear power plants.The methodology involves visual inspection and hardness measurements in situ complementedby sample removal. These procedures include (a) representative sampling of components sensitiveto selective corrosion, (b) the visual inspection, and (c) the hardness test, respectively. For an exactanalysis, additional laboratory testing is recommended.The methodology is most applicable to grey cast iron and copper alloy with more than 15 % zinc.Extension to other alloys requires supportive evidence of validation.Assessment criteria orientated to the nuclear power plant application during the past five years beforethe end of extended operation define the necessity for further engineering evaluation and action like, forexample, further sampling, higher frequency of inspection, and component repair or exchange.This specification is not applicable for components used where the representative sampling of surfacesin contact to the fluid is not detectable optically or detected with the portable hardness tester. Also,in case of non-representative component selection like in HVAC or building service application, thisspecification is not applicable. For components not used in nuclear power plant, the assessment criteriahave to be agreed by the parties. Assessment criteria of hardness test alone is not applicable to theevaluation of structural integrity of Al-bronze, NAB, and Cu-Ni.
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