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Category: Priming and Paint Coating

  1. Paint Coating Stainless Steels (OGCP ref CP 4.4)

    Primer adhesion to stainless steel sheet and plate surfaces can be an issue. Some roughening of the supplied surface may be needed by blasting, abrasion or chemical etching prior to applying the primer coats. Final cleaning is also important. Typical coating systems are outlined for external environments category C3, C4, and C5* to ISO12944 and ISO9223. The introduction in the latest version of BS EN ISO 12944 of a new corrosion class, CX Extreme, for offshore structures, is also considered.

    * The new C5 Very High corrosion class is a merging of most of the cases that featured in the former C5I and C5M Very High, corrosion classes.

     

    NB Paints that contain metallic zinc should not be used on stainless steel as embrittlement of the stainless steel substrate can occur in the event of severe fire damage. This rules out many of the available commercial paint systems, which do have zinc additions.

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