What are the commonly used process methods in the pretreatment of the degreasing process of steel st

Commonly used process methods (soaking + brushing + electrolysis) in the pretreatment of degreasing process of steel strip:

Soak for cleaning. Spray the degreasing solution on the surface of the steel belt or soak the steel belt in the degreasing solution, and use the degreasing agent to wet, penetrate and disperse the grease on the surface of the steel belt, and remove the grease on the surface of the steel belt, which is mainly used for the pre-cleaning of the steel belt.

Lye rinsing and cleaning. The method of spraying high-pressure degreasing solution on the surface of the steel belt, or brushing with a brush roll while spraying the degreasing solution, applies external force to the grease on the surface of the steel belt to do work, and removes the grease and dirt through mechanical means. It is mainly used for the removal of large areas of oil stains after pre-cleaning.

Electrolytic cleaning. By applying an electric field near the steel strip to polarize the steel strip and electrify, or directly using the method of electrifying the steel strip, the electrolyte on the surface of the steel strip produces an electrolytic reaction, and tiny bubbles of hydrogen and oxygen are generated on the surface of the steel strip, so that the grease and steel strip are peeled and removed. It is mainly used for cleaning after the removal of large area of oil stains, and removes stubborn oil stains in small pits on the surface of the steel belt.

Degreasing - rust removal - neutralization - surface tone - phosphating - hot water washing - drying, I don't know if what you need is this.

The pre-treatment is divided into ferrous metals, non-ferrous metals, plastics and wood. There are also many treatment methods, such as: sanding, pickling, flame, grinding, putty repair, passivation, etc. Don't know what you need? What does the subsequent painting process look like?

There are manual simple process and automatic pretreatment process for pretreatment, and the latter is divided into two processes: automatic spraying and automatic dipping spraying. The workpiece must be treated with surface treatment to remove oil and rust before being sprayed. In this section, there are many chemical liquids, mainly rust removers, degreasers, surface adjustment agents, phosphating agents and so on.

In the pre-treatment section or workshop of the coating production line, the first thing to pay attention to is to formulate the necessary strong acid and alkali purchase, transportation, storage and use system, to provide workers with the necessary protective clothing, safe and reliable loading, handling, configuration of equipment, and the development of emergency treatment measures and rescue methods in case of accidents. Secondly, in the pre-treatment section of the coating production line, due to the existence of a certain amount of waste gas, waste liquid and other three waste substances, so in terms of environmental protection measures, it is necessary to configure exhaust, liquid discharge and three waste treatment devices.

The quality of the pre-treated workpiece should be different due to the different process flow of the pre-treatment fluid and the coating production line. In order to prevent rust again in a short period of time, the workpiece should be phosphated or passivated in several processes after the pre-treatment: before spraying, the phosphated workpiece should also be dried to remove the surface moisture.

Small batch single piece production, generally natural drying, sun drying, air drying. For large-scale flow operations, low-temperature drying is generally adopted, and an oven or drying tunnel is used.

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.

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.

Degreasing. (powder) sodium carbonate. 200kg trisodium phosphate, 90kg sodium tripolyphosphate, 40kg sodium silicate, 50kg sodium pentahydrate, this is general.

agent) K-12 five kg TX-10 15kg AE0-9 10kg water 70kg This is also general, derusting with hydrochloric acid + sulfuric acid. After adding a little surfactant and corrosion inhibitor (is the amount of acid. 5%）。

The ratio of hydrochloric acid and sulfuric acid can be adjusted by yourself. If there is a lot of rust, the hydrochloric acid is a little thicker, and if there is an oxide scale, the sulfuric acid is a little thicker. However, it is better not to exceed 40% of the two acids combined.

Too thick and easy to corrode. Neutralization is 2%-5% sodium carbonate. The surface tone is generally made of colloidal titanium phosphate, which is good and bad (the table calls a good expensive film to be thinner and tighter), and the material in phosphating is:

Phosphoric acid. Zinc oxide. Nitric acid.

Fluorobonic acid. Citric acid. Nickel nitrate.

Ferric nitrate, ferrous sulfate (slotted before addition) hydrofluoric acid, sodium carbonate. Sodium nitrate (not added in some formulas). And then there's water.

This is general. Detection of degreasing fluids.

Total alkali point: take 10ml of degreaser working solution, add 5-6 drops of phenolphthalein indicator, titrate with H2SO4 or hydrochloric acid until the red disappears, and the number of milliliters consumed is the alkalinity of the degreaser.

Detection of phosphating working fluids.

Total acid: When 10 mL of working solution plus 5-6 drops of phenolphthalein indicator were titrated to pink, the number of milliliters of NAOH consumed was the total acid point.

Free acid: take 10 ml of working solution and add 2-3 drops of bromophenol blue indicator, titrate with NaOH, when the color of the solution changes from yellow to light purple, the number of NaOH ml consumed is the free acid point.

Number of accelerator points: 1. Fill the working solution with a 10 ml fermentation tube, add about 1g of sulfamic acid, invert the fermentation tube to make it fall to the top of the tube, and then place the fermentation tube upright, and wait for 30 seconds to read the milliliter of gas is the number of accelerator points. Rust removal is measured according to the method of measuring phosphating total acid, (the total acid is generally more than 200 points) and the pH test paper is called (generally pH is 8-9).

Organic oil emulsifier.

The first in China: non-toxic, environmentally friendly and efficient: no organic oil emulsifier.

Inorganic oil emulsifier is the latest research and development of Chengdu Hengfeng Hongye Detergent Factory for all kinds of lubricating oil, mechanical oil, mineral oil, clutch oil, gear oil, brake oil, engine oil, ink, release oil, compressor oil, refrigeration oil, vacuum pump oil, internal combustion engine oil (1: diesel engine oil. 2：

Gasoline engine oil. 3: Marine oil), bearing oil, guide oil, hydraulic oil, hydraulic transmission oil, metal processing oil, electrical insulating oil, power tool oil, heat conduction oil, anti-rust oil, special occasion oil, steam turbine oil, quenching oil, fuel oil, other occasions oil and other inorganic oil new non-toxic and environmentally friendly emulsifier.

First, product advantages.

1. Create a new era of non-toxic and environmental protection of inorganic oil emulsifiers. In the past, various solvents were used to emulsify inorganic oils. It is extremely harmful to both producers and users.

Now the advent of non-toxic and environmentally friendly organic oil emulsifiers will be a great contribution to this field.

2. Create a new era of independent emulsification of inorganic oil. In the past, the emulsification of inorganic oil was used: the compound product of solvent + emulsifier + cleaning agent, the process is complex, the cost is high, and the effect is poor. Now only one type of emulsification is needed for inorganic oil, which is emulsified immediately after use, which is efficient, fast and cost-effective.

3. Rapid emulsification of various lubricating oils, mechanical oils, mineral oils, clutch oils, gear oils, brake oils, engine oils, inks, release oils, compressor oils, refrigeration oils, vacuum pump oils, internal combustion engine oils (1: diesel engine oil. 2：

Gasoline engine oil. 3: Marine oil), bearing oil, guide oil, hydraulic oil, hydraulic transmission oil, metal processing oil, electrical insulating oil, power tool oil, heat conduction oil, anti-rust oil, special occasion oil, steam turbine oil, quenching oil, fuel oil, oil for other occasions and other inorganic oils.

Second, product performance.

1. Widely used in all kinds of lubricating oil, mechanical oil, mineral oil, clutch oil, gear oil, brake oil, engine oil, ink, release oil, compressor oil, refrigeration oil, vacuum pump oil, internal combustion engine oil (1: diesel engine oil. 2：

Gasoline engine oil. 3: Rapid emulsification of inorganic oils such as marine oil), bearing oil, guide oil, hydraulic oil, hydraulic transmission oil, metalworking oil, electrical insulating oil, power tool oil, heat conduction oil, anti-rust oil, oil for special occasions, steam turbine oil, quenching oil, fuel oil, and oil for other occasions.

2. It is widely used as an additive for various industrial cleaning agents, industrial degreasers, and hand sanitizers.

3. Acid and alkali resistant, soluble in water. The product is acidic.

3. How to use.

It can be emulsified directly with inorganic oil emulsifier, used as a powder and diluted with water for emulsification.

Fourth, a variety of formulas (the proportion is determined according to the effect and cost of the need).

1. Inorganic oil industrial degreasing powder: inorganic oil emulsifier + non-alkaline base powder.

2. Organic oil industrial degreasing powder: all-round emulsifier + non-alkaline base powder.

3. Composite oil industrial degreasing powder: inorganic oil emulsifier + all-purpose emulsifier non-alkaline base powder.

The ingredients can also be roughly told you, there is no way to check me, it is too complicated, and it is difficult to analyze professionally.

Degreasing: It is some alkali and surfactants, such as flake alkali, soda ash, silicate, etc., surfactants have non-ionic and anionic.

Rust removal: It is some acid, hydrochloric acid, sulfuric acid, phosphoric acid, etc., which varies depending on the material.

Neutralization: some weak alkali or weak acid, which acts as a buffer.

Surface tone: Crystalline nuclei are formed on the surface, some titanium salts, phosphates.

Phosphating: phosphoric acid, zinc phosphate and some film-forming accelerators.

You can go to the Internet to find an e-book called Phosphate Lesson Plan, which is much more detailed than I said. If you have any questions, please contact us.

You can't ask for 10,000 points, don't believe you try.

Surface treatment is a process method for artificially forming a surface layer on the surface of the matrix material that is different from the mechanical, physical and chemical properties of the matrix. The purpose of surface treatment is to meet the corrosion resistance, abrasion resistance, decoration or other special functional requirements of the product. Under normal circumstances, stainless steel workpieces do not need to be treated to meet the requirements of daily use, but in special cases, it is still necessary to improve the performance of stainless steel workpieces through surface treatment

1. Stainless steel passivation.

The recommended surface for this process must be iron-free, and the presence of stainless steel particles on the surface of any iron, cast iron, mild steel, medium carbon steel, or low alloy steel will promote pitting of free iron and stainless steel on its surface. This is a very serious problem, so passivation is only used to treat stainless steel and stainless iron, and the main purpose of stainless steel passivation is to prevent oxidation and corrosion of the surface of stainless steel.

2. Stainless steel pickling.

The purpose of stainless steel pickling treatment is to remove oxide scale on the surface of stainless steel after high temperature welding, heat treatment or heat working. At the same time, it also eliminates red rust-corroded steel or iron or steel particle contaminants. Note that if the acid on the surface is not cleaned after pickling, the surface will soon begin to rust and corrode, resulting in a decrease in the corrosion resistance of the steel surface layer underneath.

The stainless steel pickling process can be applied to the surface treatment of most types of stainless steel. All pickling operations result in a slight dimensional change in the metal surface as impurities are removed, so the result is a degree of matting visual brightness that may also be a significant reduction in size.

Heat treatment in a vacuum or a good controlled atmosphere, such as bright annealing, which eliminates the need for pickling, usually results in a better finish for stainless steel.

3. Stainless steel cleaning agent degreasing and degreasing.

The pre-treatment of any process of stainless steel surface treatment must first remove grease, cutting oil, drawing compounds and other lubricants, etc., before the surface heat treatment or final passivation of stainless steel components can be carried out. Stainless steel parts must also be further welded to prevent the picker from carbon at high temperatures before proceeding with the degreasing process.

Under normal circumstances, stainless steel cleaning agent is selected, which only needs to be soaked at room temperature to remove any oil stains, which is simple to operate and low labor intensity. As with other metal cleaning operations, the cleaning rate can be increased by using brushing, spraying or stirring during operations.

In addition to the above processes, such as: electroplating, anodizing, sandblasting, painting, rust removal, etc. are also common stainless steel surface treatment technologies, but because the performance of stainless steel itself can meet daily needs, so these processes are less.