Chengdu-temperature corrosion by licensing the black phosphating solution LH-38

1. Application: for automotive, motorcycle, gear, military products, motorcycles, household appliances and other requirements without coating and corrosion in the atmosphere, and the phosphate coating shall be black decorative film components. This product has been used for many customers an alternative high temperature and low temperature oxidation technology blue, not only can significantly reduce costs, but also reduce environmental pollution. 2. Main features: 2.1 phosphate coating dense, continuous, uniform, non-hanging gray black dark gray phosphate crystals. 2.2 phosphate coating film is not only anti-rust oil dip, you can have high corrosion resistance in the atmosphere. 2.3 process is simple, without surface conditioning prior to phosphate. 2.4 bath stability, not contain sodium nitrite (NaNO2), sodium fluoride (NaF) and other harmful substances, easy to adjust. 3. Technical specifications: LH-38-1 Pre-phosphate solution Item Index Amount (%) 20 solution Appearance light yellow transparent liquid Total acidity (point) 51 to 61 free acidity (point) 8-12 treatment temperature (℃) 55 ~ 65 treatment time (min) 2 ~ 3, 1-2 to use cast iron dipping LH-38-2-type black phosphate solution Item Index Amount (%) 20 solution Appearance light green liquid Total acidity (point) 61 to 81 free acidity (dot) 11 to 16 treatment temperature (℃) 60 ~ 70 treatment time (min) 10 ~ 15 4. Use dipping process: degreasing → washing → rust → washing → pre phosphate → black phosphate → washing → hot washing → drying or drying → dip rust oil → Inventory 5. Configuration Management: the preparation of pre-1000L phosphate bath: 5.1 to add 1/2 volume of water in the tank. 5.2 A total of 200kg of LH-38-1 concentrate (yellow liquid) added to the tank, while stirring. 5.3 add water to the mark and mix well. 5.4 Confirm acidity, heated to the process temperature. Black Phosphate: bath preparation method with the above numbers 5.1, 5.2, adding a total of 200kg of LH-38-2 (light green liquid) added to the tank, followed by the above numbers were 5.3, 5.4. Adjusted 5.5 1000L bath as production proceeds, bath total acidity and free acidity will gradually decline, should regularly analyze and additions. 5.5.1 Pre-phosphate total acidity increased by 1 point should be added LH-38-1 phosphate concentrate 3.4kg. 5.5.2 Total acidity increased black phosphate bath 1:00, should be added LH-38-2 black phosphate concentrate 2.5kg. 5.5.3 phosphoric acid (H3PO4) 1 ~ 12kg, free acidity can be increased from 1 to 1.1 points. 6. Packing and storage: 25kg plastic drum, stored in a cool ventilated place, shelf life of six months.