The Pragofos 1400 manganese phosphating process, without any other chemical accelerator, is nitrites free completely and causes the formation of compact and coarse-grained phosphate coatings of dark grey or black colour and of the specific weight within 10 – 30 g/m2 of excellent corrosion durabiity.
For the formation of a very fine-crystalline phosphate, the activation rinse just before the phosphating process is necessary. In the activation rinse in the Pragofos 1427 bath, just before the phosphating process, is used, very fine-grained phosphate coatings of the thickness 1-3 µm and specific weight 4-8 g/m2 are being created. On the other band, in te case of the activation in the Pragofos 1417 bath, a fine –grained phosphate coating but of larger thickness (about 3-15 µm and 8-24 g/m2 respectively) is being formed – the top volume of the thickness limit being achieved if an acid pickling operation is employed and the thicknesses at a lower limit if the pickling is omitted.
The Pragofos 1400 is predominantly suitable for the phosphating of moving machinery parts or engine parts to enhance the overall lubricating affect and, therefore, to facilitate their running-in and to prolong their life. It may be, besides, used for a better anti-corrosion protection if compared with the zinc phosphate coatings. The package available: 50 litres netto in PE barrels (Pragofos 1401) or PE lined paper bags (Pragofos 1417, Pragofos 1427).