How to spray electrogalvanized parts, what is the difference between galvanizing, spray painting, ba

There are two ways to choose: 1) Polishing the surface of galvanized parts with coarse sandpaper, the rougher the better, and use a grinder to install a steel wire polishing wheel to evenly polish the surface to produce staggered scratches on the surface, (after grinding, the dust particles will be magnetically adsorbed on the surface of the component, and it is best to wipe with a soft cloth and purge with an air pump) so that the adhesion of plastic spraying will be further enhanced! 2) The electroplating parts are washed with dilute hydrochloric acid deplating water in phosphating, and the adhesion of this treatment is the strongest, but this operation should work continuously, and the components will rust after a long delay.

The first method should not be mixed with **powder, the curing temperature and time are unchanged, and the second method can be appropriately mixed (no more than 20%) **powder. Good luck

Nice upstairs. However, the first method will still appear pinholes, because there are some salt particles in the electroplating solution that adhere to the surface of the zinc layer with the formation of electroplating, so no matter how you polish after electroplating, the pinholes will be sprayed once, only keep polishing and spraying twice, three times... The second method is equivalent to not saying, deplating with HCL after electroplating...

It doesn't mean that it is not plating. It is recommended not to use the method of spraying plastic after electroplating, and cold galvanized sheet can be purchased.

It is used for production, and is sprayed with a special phosphating solution, so that it can be achieved with ordinary cold plates.

Same effect.

First, the principle is different.

1. Galvanizing is searching: hot-dip galvanizing is to make the molten metal react with the iron matrix to produce an alloy layer, so that the matrix and the coating are combined.

2. Painting: Spraying through a spray gun or disc atomizer, with the help of pressure or centrifugal force, dispersed into uniform and fine droplets, applied to the surface of the coated coating method. 3. Baking paint:

On a substrate that has been sanded to a certain degree of roughness (usually high-density sheets), several layers of paint are sprayed. And it is baked and shaped at high temperature.

4. Spraying: Its working principle is to charge the plastic powder through high-voltage electrostatic equipment, and spray the paint to the surface of the workpiece under the action of the electric field, and the powder will be evenly adsorbed on the surface of the workpiece to form a powdery coating; The powdered coating is leveled and cured after high-temperature baking, and the plastic particles will melt into a dense final protective coating with different effects; Firmly adheres to the surface of the workpiece.

5. Dipping: Most of the liquid dipping process uses thermoplastic dipping liquid, and the thermoplastic coating film has the characteristics of preheating and softening, and can be solidified after cooling.

Second, the application is different.

1. Galvanizing: widely used in automobiles, construction, home appliances, chemical industry, machinery, petroleum, metallurgy, light industry, transportation, electric power, aviation and marine engineering and other fields.

2. Painting: It has a wide range of applications, involving various sectors of the national economy and various fields including cutting-edge technology.

3. Baking paint: mainly used in solid wood furniture industry, industry and other aspects.

4. Spraying: It is often used in the field of light industry and home decoration.

5. Dipping: Dipping products have been widely used in all aspects of production and life at home and abroad, such as hangers for drying clothes, pliers, rubber sleeves on scissors, wrenches for water valves, etc.

Third, the advantages are different.

1. Galvanizing: The hardness value of the galvanized layer is greater than that of steel; The entire surface of the steel is protected and melted zinc is easily and evenly covered in recesses, inside the fittings, or in any corner where other coatings are difficult to access.

2. Painting: Spraying operation has high production efficiency and is the most commonly used coating method today.

3. Baking paint: the paint has high requirements and good color rendering.

4. Spraying: no thinner material is required, and the construction is non-polluting to the environment and non-toxic to the human body; The coating has excellent appearance quality, strong adhesion and mechanical strength; Short curing time for spraying construction; The corrosion and wear resistance of the coating is much higher; No primer required; The construction is simple and the technical requirements for workers are low; The cost is lower than that of the painting process. Stove.

5. Dipping: the material is rich, cheap and non-toxic; Wide range of color configurations; The coating film has strong adhesion, low temperature resistance, impact resistance, wear resistance, damp heat resistance, salt spray resistance, tensile resistance, acid and alkali resistance, aging resistance, high pressure resistance, chemical resistance, excellent weather resistance, and will not produce cracks when used in the open air.

Encyclopedia - Dipping.

Encyclopedia - Spraying.

Encyclopedia - Baking lacquer.

Encyclopedia - Spray paint.

Encyclopedia - hot-dip galvanizing.

Dear, hello, I am happy to serve you, the answer is as follows: The galvanized layer of galvanized spraying needs to be passivated, and the spraying here refers to spraying powder coating. Generally, there are three treatment methods for galvanized sheet in steel mills after leaving the factory: oiling, oiling after passivation, and passivating without oiling Unless the treatment method is specified before ordering from the steel mill, considering the smooth processing, the factory generally adopts the method of oiling after passivation by default.

All oil-coated plates, whether blunt or unpassivated, must be degreased and rinsed before spraying, otherwise the adhesion will be very poor. If the amount is very large, you can go to the steel mill to order the lead sail without oil, so that it can be sprayed directly without degreasing. Spraying is powder coating spraying Most galvanized steel sheets have generally been passivated on the surface, but it is difficult for the naked eye to tell whether they have been treated.

It is usually required to be sprayed after caustic washing. However, the adhesion of the passivation film after alkali washing will be reduced after spraying, and in this case, it is recommended to wash and dry without oil stains and then spray. There are also a few galvanized sheets coated with anti-rust oil.

This kind of board must be alkali washed and sprayed, and the adhesion is OK.

I don't know which aspect you're asking; Construction, craftsmanship, aesthetics, anti-corrosion?

In terms of anti-corrosion, galvanized anti-corrosion is better, and it can be hot-dip galvanized; Then there is painting: surface treatment, degreasing, rust removal before painting, it is best to sand washing, shot blasting surface rust, and then painting, the best paint is epoxy metal coating;

Spraying and dipping are also useful, depending on where the anti-corrosion requirements are high, mainly anti-corrosion performance, or beauty, as well as cost and other factors, as long as the design requirements can be met, which saves money, which kind of use.

The difference is that it is electrically conductive after galvanizing. And the anti-corrosion ability is very good, you see that the lightning rod is plated processing. Spray paint and baking paint lie in the spray paint is cold drying, baking paint is amino paint after spraying and drying, baking paint is beautiful and high-grade, such as the top coat of the car, spraying anti-corrosion ability is between the galvanized under the baking paint, spraying is a fool's operation, relying on the layer of static electricity.

The rate of plastic ingression is high and the thickness is high, such as iron drying rack fences and so on.

Generally speaking, the face is baked paint, the anti-corrosion is galvanized, the dead angle is electrophoresis, the round accessories are sprayed, and the open air is dipped.

Summary. The surface of hot-dip galvanizing is relatively smooth, and if it is not treated by the process before spraying, the spraying layer is easy to rise and fall off. Therefore, the necessary surface treatment is still indispensable.

After hot-dip galvanizing, does the surface need to be treated?

The surface of hot-dip galvanized is relatively smooth, and if it is not treated by the process before spraying, the spraying layer is easy to layer and fall off. Therefore, the necessary reputation of the surface such as Huili is still indispensable.

After the workpiece is pretreated, the surface of the workpiece not only does not have oil, rust and dust, but also generates a uniform and rough layer of gray cover car color phosphating film that is not easy to rust. This phosphate film can not only prevent rust, but also increase the adhesion of the spray layer.

, direct painting can be.

2. The galvanized sheet does not need to do any processing, and can be directly sprayed with an air compressor + paint gun.

3. It is recommended to use alkyd primer as the base and alkyd topcoat to cover the surface. Choose the color of the paint according to your preference.

4. For outdoor use, it is recommended to use iron red anti-rust paint or medium gray anti-rust paint.

5. Dry it naturally outdoors. If conditions permit, the galvanized parts can be phosphated, or a thin layer of phosphate primer can be sprayed first. Or sand sweeping on the surface of smooth galvanized parts.

Wipe the surface of the galvanized workpiece and galvanized pipe with solvent (i.e., zinc oxide yellow primer thinner) to remove the protective layer of the workpiece and increase the cleanliness. Two-component zinc oxide yellow primer: Paint is prepared in strict accordance with the ratio of paint and curing agent, and after 30 minutes of curing, the appropriate construction viscosity is modulated, and it can be sprayed.

One-component epoxy zinc yellow primer: modulate the right application viscosity and apply with the right application method. Galvanized parts are non-ferrous metals, and non-ferrous metals have poor adhesion compared with ferrous all-metals; The commonly used iron alkyd red primer and epoxy iron red primer on the market should not be used for galvanized parts, otherwise it is easy to fall off.

It should be pointed out that the alkyd paint on the galvanized parts will undergo saponification reaction, not only the coating will fail, but the original galvanized layer will also be damaged.

Install the wiring.

The electrical installation wiring diagram is mainly used for the installation and wiring of electrical equipment, line inspection, line maintenance and troubleshooting. In the diagram, the actual wiring between the electrical equipment and electrical components should be displayed, and the data required for external wiring should be marked. In the electrical installation wiring diagram, the text symbols, component connection sequences, and line numbers of each electrical component must be consistent with the electrical schematic diagram.

Drawing principles: 1. When drawing the electrical installation wiring diagram, each electrical component is drawn according to its actual position in the installation baseplate. The surface occupied by the component is addressed in uniform proportions according to its actual size.

2. When drawing the wiring diagram of electrical installation, all the parts of an element are drawn together and framed with dotted lines, and sometimes multiple electrical components are framed with dotted lines to indicate that they are installed on the same installation baseplate.

3. When drawing the electrical installation wiring diagram, the wiring between the electrical components inside and outside the installation base plate is connected through the terminal block, and there are several leads connected to the external circuit on the installation base plate, and the contact points of several wires should be drawn on the terminal board.

4. When drawing the wiring diagram of electrical installation, adjacent wires that go to the same direction can be drawn as a strand.

First of all, we need to pay attention to what is the purpose of painting galvanized parts, whether it is to repair the leakage of hot-dip galvanizing or to repair the color. If it is to repair the missing plating, it is recommended to use a special hot-dip galvanizing paint with high zinc content. Refinish paints with a 96% zinc powder content are highly recommended.

In addition, due to special requirements in some industries, it is necessary to paint on the galvanized parts layer, please choose special paint for galvanized parts, because ordinary paint is very prone to paint bursting.

Galvanized sheet mainly. Remove the oil. Follow.

Dusting. Galvanized sheet to remove oil, if the requirements are high.

You can use degreaser to soak (caustic soda) in the cylinder for 15-20 minutes, and some degreasers need to be heated to promote the slow reaction. If your product requirements are not high, you can directly mix the detergent with water and wipe it with a cloth, divided into two processes, first wipe the entire workpiece with a relatively wet cloth, and then wipe it with a squeezed cloth (choose a cloth that does not shed hair), and then dry it by blowing a little, so that the benefits of processing are obvious, less moisture, even if there is no sun in the room for a day is enough to dry!

Before spraying, dust should be removed, and those with low requirements should be wiped slightly with a cotton cloth that does not shed hair. If the requirements are high, wipe with a special dust cloth for spray painting, and what are the specific points to pay attention to.

There are instructions on the packaging of that dust cloth!