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WX-Z3400 phosphating agent

Keywords: water-based epoxy resin/water-based acrylic resin/water-based polyester resin.

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Product Details

1. Overview
WX-Z3400 phosphating agent is composed of zinc oxide, phosphate, manganese, etc. It is suitable for surface treatment before coating of hot galvanized sheet and cold galvanized zinc sheet, so that a layer of water-insoluble phosphate composite film is formed on the surface of the product to improve the adhesion of the coating to the metal surface and inhibit the corrosion under the coating film.

2. treatment process
Process conditions: soaking, spraying, swimming immersion.
Process flow: degreasing-water washing-surface conditioning-phosphating-water washing-passivation (whether passivation is required according to performance test requirements or anti-rust effect of plates)-water washing-drying.
Tank distribution: calculate the working volume m3 of phosphating tank, first inject 3/4 tank clear water, and add WX-Z3400 phosphating agent according to the calculated amount; After stirring evenly, add neutralizer 4kg/m3 and accelerator 2kg/m3, stir evenly, add water to the working liquid level, then detect the free acidity of phosphating solution, add neutralizer according to the detection results, and adjust the free acidity to about 0.8.

3. technical indicators
Distribution tank: WX-Z3400 phosphating agent 50-80kg/m, neutralizing agent 4kg/m, accelerator 2kg/m
Temperature: normal temperature to 45 ℃
Time: 8-10 minutes
Total acid: 20-40 points
Free acid: 0.5-1.0 point
Accelerator: 0.5-3.0
Detection method:
Total acid: take 10ml of working solution, inject it into conical flask, add 20 ml of water, add 2-3 drops of phenolphthalein indicator, titrate with 0.1N NaOH standard solution, the solution changes from colorless to pink as the end point, and the ml number of standard solution consumed by titration is the total acid number of this solution.
Free acid: take 10ml of working solution, inject it into conical flask, add 20 ml of water, add 2-3 drops of bromophenol blue indicator, titrate with 0.1N NaOH standard solution, the solution changes from yellow to light blue as the end point, and the ml number of standard solution consumed by titration is the number of free acid points of this solution.
Accelerator: fill the fermentation tube of the working liquid device, add 1-2g BB powder, quickly plug the mouth of the fermentation tube with your thumb, reverse the fermentation tube, let BB powder flow back to the other end of the fermentation tube, then reverse it back, and observe that the volume ml of bubbles in the fermentation tube is the number of points of the accelerator.

Daily management and maintenance of 4. working fluid
1. Each shift analyzes the parameters of phosphating solution.
2, in the phosphating process with the reaction process of precipitation and improper addition of neutralizing agent, promoter, will also make the phosphating solution in the precipitation, when the sediment should be more removed, the conditions of the factory is best to use continuous filtration slag, followed by high pool slag. Slagging with shovels and buckets should bring out as little solution as possible.
3, phosphating process should pay attention to shaking the workpiece, exclude the air bag, dense loading of the workpiece or slender tubular parts should be put out of the liquid surface of the workpiece and then immersed in the solution, so that the contact with the workpiece solution can be updated, phosphating time is generally 10 minutes, spray 3 minutes, dense loading parts should be appropriate to extend the phosphating time.
4. Maintenance of working fluid: when the total acid is higher than the standard, tap water can be used to dilute and reduce, while if the total acid is too low, phosphating agent can be added to the control range. When the free acidity is higher than the standard, it can be adjusted with neutralizer. After diluting the calculated amount of neutralizer, it can be slowly added into the phosphating tank to mix. If the concentration of accelerator is lower than the standard, a large amount of sediment will be generated, if it is higher than 5 o'clock, it can continue to work; if it exceeds 5 o'clock, it will strengthen stirring to reduce volatilization.
5, add 2KG of medicament per ton tank total acid rose by about 1 point; Add 1KG of medicament free acid per ton tank and increase by about 0.1 points.

5. considerations
1. Parameters of equipment and working fluid;
2, each process must be cleaned;
3, into the phosphating workpiece to ensure that the oil clean;
4. The time interval between phosphating and coating shall not exceed 16 hours;
5. When working in an environment with good ventilation conditions, the operator should wear safety protective equipment and not directly contact with the skin. If the liquid medicine contacts the skin or eyes, it should be rinsed with water immediately. In severe cases, medical treatment should be sought.

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