Two new cost-saving, non-chromate pretreatment processes, primarily for use on aluminium and aluminium alloy surfaces - 'PP920' and 'PP910' - have been introduced by Pre-Treatment Solutions (PTS) Ltd. PP920 is a "dry-in-place" replacement for chromate-based products for the pretreatment of aluminium and aluminium alloys, as well as magnesium and zinc (ie: galvanized surfaces). Avery pale surface finish is produced, eliminating the possibility of pretreatment 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 15°C and 35°C, 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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