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ISO 4623-2:2016

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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(fā)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 鹽霧試驗箱鹽霧試驗箱

    Q-FOG CRH1100是一款的具有相對濕度控制功能和溶液噴淋功能的鹽霧試驗箱.

    Q-FOG CRH1100 馬上詢價
  • 鹽霧試驗箱圖片 鹽霧試驗箱鹽霧試驗箱

    Q-FOG CRH600比起SSP/CCT鹽霧試驗箱增加了一個可調(diào)濕度控制功能,這意味著CRH鹽霧試驗箱具備更廣泛的標準適用范圍。

    Q-FOG CRH600 馬上詢價
  • 交變鹽霧試驗箱圖片 交變鹽霧試驗箱交變鹽霧試驗箱

    CRH交變鹽霧試驗箱可提供對自然大氣腐蝕極佳的實驗室模擬,可滿足ASTM B117,ASTM B368,ASTM D1654,ASTM D1735等標準的測試要求。

    CRH-600 馬上詢價
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