Pretreatment process flow 20, pretreatment process flow

1.Workpiece material: Iron (zinc phosphating), degreasing - washing - rust removal - surface tone (optional water change washing) - phosphating - washing - washing - drying (sun drying).

Simple insurance, environmental pollution, usually degreasing is the most likely problem.

Iron (iron phosphating) degreasing - washing - rust removal - surface tone - phosphating - washing - washing - drying Relatively environmentally friendly, but the operation requirements are very high, and it is often easy to have problems without a few years of experience.

2.Workpiece Material: Aluminum, Degreasing, Washing, Phosphorus Passivation (Actually, the best is hexavalent chromium.)

solution) – wash with water.

Aluminum turns black when exposed to acid, so there is little rust removal (pickling) in the middle. If there are a lot of white rust spots, it is necessary to pickle before passivation, and it must be accurate to the second, and immediately wash and the next process.

If the iron workpiece is to be sprayed on the best pre-treatment plan, first soak it in the tank to remove the oil - wash - rust removal - surface tone (thin oil) - pendant spray) - degreasing - washing - phosphating - washing.

Personally, it is not recommended to spray on degreasing, and I personally oppose spraying on pickling, and the gap between the groove immersion workpiece must be left.

Pre-treatment precautions:1Degreasing must be thorough, often scoop slick oil often test the agent, degreasing is not good, the back road gods and horses are floating clouds.

2.Immediately after the rust is removed, the speed of the metal rust return is only a few seconds, and you don't have time to blink. 3.

The pre-treatment water must be held reluctantly, and the child can't catch the wolf.

The mentality of each washing section must be large, urgent and ruthless. Many people think that washing is just a rinse, and the meaning is enough. Sorry, you're wrong. Suzhou Park.

There is a foreign company, there is no washing after spraying and degreasing, and the putty is 1 mm thick after pre-treatment and drying. An enterprise in Shaoxing, after rust removal, the water is not clean, and the workpiece after pre-treatment is comparable to the Peking Opera mask.

A company in Yuyao, Ningbo, saved some water after phosphating, and after three months, the product began to peel.

Manual pre-cleaning, hot water washing, pre-degreasing, degreasing, washing.

1. Washing. 2. Surface adjustment, phosphating, and washing.

3. Washing. 4. Pure water.

1. Pure water. 2. Pour water.

1. Electrophoresis, UF1, UF2, UF3, pure water.

3. Pure water. 4. Pour water.

Second, the elevator is sent to the drying line.

A process flow is also known as a "machining flow" or "production flow". Refers to the use of certain production equipment or pipelines from raw materials.

The whole process of continuous processing is carried out sequentially from the input of the inner material to the output of the finished product.

The basic content of the process is that the worker uses labor tools to change the shape, size, position, composition, performance, etc. of the labor object to make it the expected product.

Because factors such as equipment production capacity, precision and worker proficiency are very different in different factories, the processes developed by different factories may be different for the same product; Even the same factory may do different processes at different times. It can be seen that for a certain product, the production process is uncertain and not unique.

Let's start by introducing the role of each step in the surface treatment process you listed

Degreasing: The function of degreasing is to remove grease and oil stains on the surface of the plate;

Water washing: The function of water washing is to wash off the degreaser and prevent the degreaser from being brought to the next process, polluting the next process or destroying the balance of the tank liquid components in the next process;

Surface tone: The function of surface tone is to adjust the surface properties of the plate, improve the surface state, make the phosphating crystals fine, and improve the quality of phosphating;

Phosphating: The effect of phosphating is to generate a layer of phosphate protective layer on the surface of the pre-treated qualified plate, and the function of the phosphate film is to improve the adhesion of the paint film and improve the corrosion resistance of the plate;

Washing: Washing after phosphating is to clean the phosphating solution attached to the surface of the plate to prevent the residual phosphate from participating in electrochemical corrosion in the future anti-corrosion process.

By the way, the process you listed lacks a pickling process, maybe your plate is not corroded, even if there is no rust, it should be pickled to remove the surface hardening layer of the plate and improve the quality of phosphating.

Degreasing agent, surface adjustment agent, phosphating agent, rust inhibitor, etc. You can work with us.

The process of weaving and dyeing woven fabrics to finished products mainly includes:

Weaving process: spinning, sizing, weaving, quality inspection, warehousing.

Finished product process: surface accessories incoming inspection, technical preparation, cutting, sewing, keyhole fastening, ironing, garment inspection, packaging, warehousing or shipping.

The dyeing of woven fabric is not very complicated, first it needs to be washed with water to remove the pulp, and then it can be dyed.

Let's take pure cotton as an example: basically spinning-weaving-dyeing and finishing-finished product testing. If you want to divide the fine point, you have to spin and dye and finish apart, spinning is basically carding - drawing - roving - spinning - post-processing, and then weaving - and then entering the dyeing factory, first pre-treatment, that is, we say deboiling and bleaching, and then dyeing and printing, to see whether you want to dye the cloth or flower cloth, and then finishing, the commonly used scraping is coating, calendering, embossing, and soft finishing, what anti-felt shrinkage finishing a lot, and then to the finished product inspection and packaging, basically that's it.

It is recommended that you buy a book, read that this process is very complicated, and it cannot be explained in a few words.

There are barrels, to the washing machine, to phosphating, to drying, and to spray powder!!

First, the process description:

1. Shearing: The purchased steel coil is cut by the cutting machine according to certain specifications. (n1) (cutting machine).

2. Stamping forming: the steel after shearing is stamped by the stamping machine to form the required shape. (n2) (stamping machine).

3. Water washing: the stamped steel coil is manually cleaned with tap water. （w1）

4. Degreasing: Clean the oil attached to the steel by adding alkali solution. （w2）

5. Washing: Wash with tap water to remove excess lye. （w3）

6. Acidification: remove the surface hardening layer of the steel in the acidic solution to improve the phosphating quality. （w4）

7. Water washing: remove excess acid from the steel. （w5）

8. Surface adjustment: through the aqueous solution containing colloidal titanium phosphate, the steel is formed a secondary film before phosphating, which accelerates the phosphating speed, refines the phosphating crystallization and increases the phosphating crystal point.

9. Phosphating: Put the pre-treated steel into the phosphating solution to form a phosphating film. （w6）

10. Water washing: rinse with tap water to remove the excess phosphating liquid on the steel to prevent the residual phosphate from participating in electrochemical corrosion in the future anti-corrosion process. （w7）

11. Drying: Dry the steel washed with phosphating water in an electric oven.

12. Powder spraying: send the steel into the powder spraying chamber for electrostatic powder spraying operation. （g1、n3）

Working principle: a high-voltage corona discharge electric field is formed between the spray gun and the workpiece, when the powder particles are ejected from the nozzle through the discharge zone, a large number of electrons are collected and become negatively charged particles, which are adsorbed to the positively charged workpiece under the action of electrostatic attraction. When the powder adheres to a certain thickness, the effect of "same-sex repulsion" will occur, and the powder can no longer be adsorbed, so that the thickness of the powder layer of each part is uniform, and then the powder layer is leveled into a uniform film layer after heating and baking and solidification.

13. Curing: melting, leveling and AC curing the coating in a high-temperature oven (about 200 meters).

14. Offline: Prepare the product offline**.

G1 is the dust generated when dusting is sprayed; n1 is the mechanical noise generated by the shearing machine when shearing; N2 is the mechanical noise generated by the stamping machine during stamping; N3 is the mechanical noise generated by powder spraying; W1 Wastewater containing metal residues and oils; w2 oily alkaline wastewater; W3 alkaline wastewater; w4 acidic wastewater containing metal ions; W5 acid-containing wastewater; W6 phosphate solution containing colloidal titanium; W7 is an aqueous solution containing phosphating solution.

To peen the shot first, smooth the surface.

Pre-treatment process for car body coating.

The main purpose of car body coating is to improve the protection and decoration of the body, enhance the anti-corrosion ability of the body, and improve the appearance of the body; In addition, the requirements for environmental protection at home and abroad are getting higher and higher, in order to more effectively reduce the pollution caused by the automobile manufacturing process and better protect the environment, automobile manufacturers are committed to the research and application of various new processes, new technologies, new materials and new equipment, and continuously improve the quality of car body coating. In order to enhance the adhesion between the steel plate and the coating of the body substrate and improve the corrosion resistance of the body substrate, the surface treatment of the body-in-white is carried out before painting. This article briefly discusses the relevant processes, materials, equipment, and process management of the pre-paint surface treatment of Chery Automobile's second coating workshop.

Among the various metal surface treatment methods, the phosphating process has been widely used. The process flow of pre-surface treatment (referred to as pre-treatment) of body paint in Chery Automobile's **** painting workshop No. 2 is shown in Figure 1.

There are certain instructions for each step, so please see for yourself.

It's not very clear to ask. Direct aluminum pickling and drying can be sprayed.