A scribe mark cut through a coating of paints or varnishes on metal can give rist to various types of corrosion, such as blistering of a coating, corrosion of the metal under the coating as well as filiform corrosion. Filiform corrosion tends to develop under specific conditions of temperature and relative humidity and when traces of acids, bases or salts are present either under the paint coating or at breaks in the coating. These conditions are often found in marine and/or industrial environments. A certain amount of under-creep corrosion of the substrate, starting from the scribe mark, will always occur. Filiform corrosion, however, is considered to be present only if the typical pattern in the form of treads is obvious. This part of ISO 4623 describes a test procedure for assessing the protective action of coatingts of paints or varnishes on aluminium against filiform corrosion arising from a scribe mark cut through the coating. It is only suitable for assessing the performance of the coating/substrate combination tested. It is not suitable for predicting the performance of the coating on different substrates.#,,#
DIN EN ISO 4623-2-2004由德国标准化学会 DE-DIN 发布于 2004-06。
DIN EN ISO 4623-2-2004 在中国标准分类中归属于: G51 涂料,在国际标准分类中归属于: 87.040 涂料和清漆。
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