Powder coatings are applied to articles basically automatic or hand sprayer, and then subjected to polymerization in a special oven and at a precisely defined temperature.Since the price of powder painting in specialized salons is high enough, we will try today to carry out the procedure at home.But before that, you must first worry about choosing the room where you do work, buy the necessary equipment and prepare the surface carefully.So we start!
- choice of equipment
- powder coating
- coating process baking paint
Selection of equipment for high-grade and high-quality powder coating paint process is necessary to select the right roomwhere the procedure will take place.For such purposes the usual garage, which is enough space to work.
So, work on the surface of the powder paint color is to start with the preparation of equipment for powder coating of metal.The main equipment - a special camera.It t
Painting booth includes a camera itself, which is made of powder paint spraying and smelting furnace.If you do not plan to engage in painting all the time, there is no need to buy a professional oven, for this to work, you can adjust the normal duhovochny closet.
addition chamber for the process of powder coating requires an electrostatic spray gun, allowing you to connect the compressed air.For this purpose, the compressor may also be used.By purchasing the compressor, it is necessary to draw attention to the presence in the filter assembly to the high pressure.
Before the powder coating should ensure that all processes were made in a room with good lighting.You can use this for fluorescent lamps, it is necessary that the paint does not stick to the hot surface of the lamp.And of course, that the procedure should be painting the building excellent ventilation, without which the entire process turns into harmful for the body.
To assemble the remnants of paint powder, you can use a heat exchanger.But it is also suitable in the initial stage and an ordinary vacuum cleaner cyclone as "traditional" vacuum cleaner is likely to get clogged.To procedure takes place systematically and without fail, it is advised to take care of the strong electrical grounding.
When processing large items or large quantities common to use special transport system.Because of this painted parts easily move throughout the entire process of painting with powder paint between stages.
principle of operation of the transport system lies in the fact that the painted parts served on trolleys or special suspension that move on rails.This transport system allows you to continuously carry out the color, which in turn significantly increases the productivity of the entire workflow.
Preparation products is the longest and time consuming process that often do not pay much attention, but it depends on the quality, flexibility and durability of the coating.Pretreatment for painting is the removal of any contamination, degrease parts and phosphate to increase adhesion, as well as protection from corrosion.Purify
surface treated by chemical or mechanical means.When mechanical cleaning use steel brushes or grinding disc, available lapping with a clean cloth that is wetted in a solvent.With regard to the chemical nature of the processing, it is carried out using an alkaline, acidic or neutral composition, and solvents that are usually choose, depending on the level of contamination, material type and dimensions of the machined surface.
Application conversion sublayer, as shown in the powder coating, prevents the coating formed under different moisture and contaminants that trigger peeling and future destruction of the coating.The procedure for phosphating the surface with the application of inorganic dyes can increase the adhesion - adhesion of paint to the surface 2-3 times, and protect it from rust.
When removing oxide (rust, scale and oxide film) is a very effective abrasive (shot blasting, drobometnaya, mechanical methods) and chemical cleaning (etching).Abrasive blasting is carried out by using fine particles (the sand fraction), steel and iron pellet, walnut shell, which are fed with high velocity onto the surface of the product by centrifugal force or compressed air.These particles are capable of chipping pieces of metal from rust, scale or other contaminants, which significantly increases the adhesion of the coating.
etching is the removal of rust, oxides and other contaminants by means of solutions based on nitric, hydrochloric, phosphoric and sulfuric acid or sodium hydroxide.They contain inhibitors which retard dissolution of the cleaned surface.Benefits of chemical cleaning to abrasive - high performance and ease of use.But after such a procedure is recommended to rinse the cleaned surface of the solutions that require the use of additional cleaning agents and increases the cost of powder coating.
final stage of preparation of the surface is a passivated - Body treatment compounds of chromium nitrate and sodium.Passivation is carried out in order to prevent secondary corrosion at any stage of preparation of the surface - after phosphating, degreasing and chromate.After completing the process of rinsing and drying parts in the furnace can be assumed that the surface is ready for application to paint it as a powder.
After the pre-processing, you can put the object being sprayed into the chamber spraying, where it will be applied a special powder paint.The main purpose of this box appears capture powder particles that do not have time to settle on the painted parts, recycling dye composition, preventing it falling into the room.Paint inside the camera has a filter system, cleaning means (shakers, bunker) and the suction system.
There are communicating and dead-end types of boxes.The deadlock spray cabinets made of painted products that are small in size, but large items subjected to lengthy color.Known and automatic models for powder coating of metal, where the powder coating is applied in seconds to the surface using guns manipulators.
The most common method of powder coating acts as an electrostatic spraying - application of electrostatically charged material to a grounded piece using a pneumatic atomizer, which is called a gun or spray applicator.
When you have already caused the paint on the product, it should be forwarded to the next stage - the formation of a coating which includes a melting ink layer, the formation of the film on the cover, rejection and cooling products.
reflow process is carried out in a special chamber or furnace.There are many types of these cameras polymerization, depending on the characteristics of their production of the device may vary.Speaking in accessible language, this is a kind of oven drying cabinet, which has an electronic "stuffing".
With control unit may control the chamber temperature and the period of dyeing, setting automatic shutdown at the end of dyeing process.The source of energy for the polymerization chamber is electricity, oil or natural gas.There are vertical and horizontal, blind and continuous, single and multipass paint oven.
procedure reflow and curing of powder coating technology, respectively, takes place at a temperature close to 150-220 degrees Celsius for 15-30 minutes, in the end the film is formed, that is, the polymerization of powder paint.The main requirement for the polymerization chamber is constantly maintaining a certain temperature, stained with the product to warmed evenly.
required mode to create the coating is selected in view of the product, the variety of paint and powder paint oven.After the procedure, the polymerization of the coloring product is cooled in the open air, after cooling down, you can assume that the coating is prepared.
process of baking the paint
After powder painting with his hands on the surface of the product to be placed in the oven which pre-heat to about 210 degrees Celsius.The paint must be "baked" for about a quarter of an hour.This is not allowed to open the oven to check the condition of the paint.After the paint is completely dry, carefully remove the metal from the oven and wait until it cools down.
During the powder coating, remember that hot metal softer (and very hot), so look for a secluded place for him not to touch it by accident and did not get burned.When the metal has cooled, you can admire your work!Powder coating is now complete.