美利体育登录入口官网:DIN EN ISO 2931:2025-01 铝及其合金的阳极氧化 通过测量导纳来评估密封阳极氧化涂层的质量(ISO 2931:2017)
Anodizing of aluminium and its alloys - Assessment of quality of sealed anodic oxidation coatings by measurement of admittance (ISO 2931:2017); German version EN ISO 2931:2018