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Phos-Prep, the modern solution for Pretreatment. |
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PHOS-PREP PP933 Alkaline Etch Cleaner is formulated for the spray or immersion pre-treatment of aluminium on powder coating plants. The system is designed to produce a chemically clean aluminium surface to give uniformity of reaction during subsequent processing. PHOS-PREP PP933 Alkaline Etch Cleaner is a powder, and a new bath is made up by its addition to warm water to make a bath concentration of between 10 grams/litre and 40 grams/litre, depending on the cleaning and etch rate required. The solution should be operated at temperatures between 45°C and 70°C. Typical immersion times are 3 to 8 minutes, depending on the amount of etching required. PHOS-PREP PP933 Alkaline Etch Cleaner is designed for plants that have little or no fume extraction. The process tank and pipe-work may be constructed from mild steel and light metal fittings must be avoided.
LABORATORY CONTROL Transfer a 25 ml sample of the etch bath into a titration flask and add 50 ml clean water and bromothymol blue/phenol red indicator. Titrate against normal hydrochloric acid until the colour changes from blue to yellow. Bath Concentration (grams/litre) = ml M HCl x 6 To replenish, add 1kg of PHOS-PREP PP933 per 1000 litres of bath for each gram/litre that the concentration is lower than required control point, between 1.6 and 6.4. |
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A Powder form Alkaline Etch and Degreaser for Aluminium. |
