Chromium-free passivation method for galvanized steel sheet by using molybdate/polyphosphate composite system
A technology of polyphosphate and chromium-free passivation, which is applied in the coating process of metal materials, etc., can solve problems such as poor corrosion resistance, and achieve the effects of stable process, easy control, and stable solution
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Embodiment 1
[0036] The experimental material is hot-dip galvanized steel plate
[0037] 1. Degreasing: Sodium hydroxide 5g / L, sodium silicate 7g / L, sodium phosphate 3g / L, OP emulsifier 3g / L, temperature 50~60℃, time 1 minute, tap water for 1 minute, deionized water for 0.5 Minutes, wash with alcohol and acetone mixture for 1 minute, dry with cold air, and seal the non-working surface with chemical glue;
[0038] 2. Acid etching: a mixture of 3% nitric acid and 3% hydrochloric acid, the temperature is room temperature, the time is 0.5 minutes, tap water for 1 minute, deionized water for 0.5 minutes;
[0039] 3. Passivation treatment: sodium molybdate 20g / L, sodium polyphosphate 30g / L, nitric acid 2ml / L, sulfuric acid 0.2ml / L, temperature 55°C, pH value 2, treatment time 2 minutes, tap water wash 1 minute , The drying temperature is 55°C.
[0040]4. The galvanized steel sheet obtained by the above method is tested according to GB / T 10125-1997 artificial atmosphere corrosion test salt ...
Embodiment 2
[0042] The experimental material is galvanized steel plate
[0043] 1. Degreasing: sodium hydroxide 5g / L, sodium silicate 7g / L, sodium phosphate 3g / L, OP emulsifier 3g / L, temperature 50-60℃, time 1 minute. Wash with tap water for 1 minute, wash with deionized water for 0.5 minutes, wash with a mixture of alcohol and acetone for 1 minute, dry with cold air, and seal non-working surfaces with chemical glue;
[0044] 2. Acidic etching: a mixture of 3% nitric acid and 3% hydrochloric acid, the temperature is room temperature, the time is 0.5 minutes, tap water for 1 minute, deionized water for 0.5 minutes;
[0045] 3. Passivation treatment: sodium molybdate 30g / L, sodium polyphosphate 40g / L, nitric acid 2ml / L, sulfuric acid 0.2ml / L, temperature 55°C, pH value 2, treatment time 2 minutes, tap water wash 1 minute , The drying temperature is 55°C.
[0046] 4. The galvanized steel sheet obtained by the above method is tested according to GB / T 10125-1997 artificial atmosphere corrosi...
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