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Phos-Prep, the modern solution for Pretreatment. |
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PP920 is a “dry-in-place” replacement for chromate-based products for the pre-treatment of aluminium and aluminium alloys, as well as magnesium and zinc (ie: galvanised surfaces). A very pale surface finish is produced, eliminating the possibility of pre-treatment staining being visible through the final coating. PP920 provides excellent adhesion and corrosion resistance after subsequent painting or powder coating, and requires no post-rinsing. It is said to be ideal for hard water areas. The process operates at temperatures between 15oC and 35oC, with an immersion time of between two and three minutes. It is also suitable for spray application for between 10 and 30 seconds.
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Process time is similar to an existing Alochrom process, which means that existing plant layouts or process times do not have to be altered. It eliminates the post rinse stage resulting in no effluent.
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Consumption rates for the above products are 10ml/m2 of substrate treated (ie: 100 square metres will use one litre of product). The products PP920, PP932 and PP933 can be used in existing equipment immersion or multi-stage spray application and control is simple with full acid and free acid titration. The processes meet BS6496 and BS EN ISO 12206 2004 (Paint and Varnishes Coatings of Aluminium for architectural purposes) although PTS recommends potential users to undertake independent testing. |
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The PP920 process requires pre-cleaning of the aluminium substrate, either with the company’s ‘PP932’ ambient acid etch degreaser or ‘PP933’ alkaline aluminium etch degreaser. These products remove the oxides present on the surface to allow the correct conversion reaction to take place and ensure effective bonding of the paint or powder to the treated surface. |
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Dry In Place For Aluminium Plus Galvanised Zinc And Magnesium |
