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        首頁 > 標準大全 > ISO 4623-2:2016標準詳情
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        ISO 4623-2:2016測試標準

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        ISO 4623-2:2016標準介紹

        ISO 4623-2:2016 英文介紹

        A scribe mark cut through a coating of paints or varnishes on metal can give rise to various types of corrosion, such as blistering of the 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-corrosion of the coating, 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 threads is obvious.

        1 Scope

        This part of ISO 4623 describes a test procedure for assessing the protective action of coatings 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.

        2 Normative references

        The following referenced documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

        ISO 1513, Paints and varnishes — Examination and preparation of test samples

        ISO 1514, Paints and varnishes — Standard panels for testing

        ISO 2808, Paints and varnishes — Determination of film thickness

        ISO 3270, Paints and varnishes and their raw materials — Temperatures and humidities for conditioning and testing

        ISO 4628-8, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity and size of defects, and of intensity of uniform changes in appearance — Part 8: Assessment of degree of delamination and corrosion around a scribe or other artificial defect

        ISO 4628-10, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity and size of defects, and of intensity of uniform changes in appearance — Part 10: Assessment of degree of filiform corrosion

        ISO 15528, Paints, varnishes and raw materials for paints and varnishes — Sampling

        3 Terms and definitions

        For the purposes of this document, the following terms and definitions apply.

        3.1filiform corrosion

        type of corrosion proceeding under a coat of paint, varnish or related product, in the form of threads, generally starting from bare edges or from local damage to the coating

        Note 1 to entry: Usually the threads are irregular in length and direction of growth, but they may also be nearly parallel and of approximately equal length. They usually follow the extrusion direction and do not cross over one another. They need to be initiated by aggressive ions.

        Q-fog CRH鹽霧試驗箱用于ISO 4623-2:2016 的測試方法

        Q-fog CRH鹽霧試驗箱用于ISO 4623-2:2016 的測試方法

        Q-fog CRH鹽霧試驗箱用于ISO 4623-2:2016 的測試方法

        溫馨提醒:本ISO 4623-2:2016可能存在更新的版本,建議尋找ISO 4623-2:2016的發行商確認。

        符合 ISO 4623-2:2016 標準的
        老化試驗箱

        • 鹽霧試驗箱圖片 鹽霧試驗箱

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        • 交變鹽霧試驗箱圖片 交變鹽霧試驗箱

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          CRH-600 馬上詢價
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