High-temperature corrosion-resistant phosphating solution
A corrosion-resistant, phosphating technology, applied in the direction of metal material coating process, etc., can solve the problems of insufficient adhesion of phosphating film, limited material range, weak corrosion resistance, etc., and achieves good blackness and material range. Wide and strong adhesion
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[0029] A high-temperature corrosion-resistant phosphating solution, a mixed solution prepared from the following components, the weight of each component in each liter of mixed solution is:
[0030] 80% phosphoric acid 425g
[0033] Citric acid 12.5g
[0035] Nitric acid 5g
[0036] Nickel nitrate 5g
[0037] Chromic acid 2.2g
[0038] Polyvinyl alcohol 3 g
[0039] Sodium hydroxymethylcellulose 2 g
[0040] The balance is water.
[0041] When working: Prepare the above phosphating solution stock solution and water at a ratio of 1:15 to make a working solution.
[0042] First, pour water into the phosphating tank to 60% of the effective volume of the phosphating tank, weigh the required amount of the phosphating solution of this embodiment and pour it into the phosphating tank to fully stir to make a working solution, and adjust the process range of the working solution to the total acidi...
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