Can you provide stainless steel chemical blackening treatment manufacturers?

The blackening of the surface of stainless steel is a common process in chemical treatment. Principle: Through chemical treatment methods, a layer of oxide film is produced on the surface of the metal, and the purpose of surface treatment is achieved through the oxide film.

This surface treatment process uses the principle that the metal surface is subjected to the force of the corresponding equipment to produce a layer of oxide film that can isolate the metal from direct contact with the external environment. To put it simply, the surface blackening process refers to a chemical surface treatment method, which uses the oxide film produced on the metal surface to achieve the corresponding surface treatment purpose.

Processing effects. Color: The color of the stainless steel blackening treatment is black bright or matte black. There are no bruises on the surface and the color is uniform.

Film thickness: microns, does not affect the precision of the product, higher or lower has a greater impact on the size of the product, is a defective product.

Corrosion-resistant effect. Draw 2 pieces to do the neutral salt spray test, the salt spray test can pass the 600-800 neutral salt spray test as well, if it can not reach 600 hours for the poor, the surface is clean, tidy, no black ash, and the film is firm.

Find stainless steel chemical blackening treatment manufacturers Suzhou Yuxinlai Hardware Factory can, Linlong Precision Hardware Factory can also do (two), stainless steel blackening.

Stainless steel blackening is divided into three types: low-temperature blackening, optical matting blackening, and high-temperature blackening.

1. The quality of stainless steel low-temperature blackening process is better than that of the same industry, the blackening film of the treated workpiece is firm, the adhesion is good, the oil seal is dark, and there is a certain wear resistance. Comply with the national standard GB T15519But it can't compete with high temperatures.

2. The stainless steel optical matting and blackening process is treated by a special method to make the workpiece get a matte, non-reflective black oxide film, strong and firm binding force of the blackened film, no hanging ash, good wear resistance, in line with the military standard WJ1535-82It is widely used in precision optical equipment and components such as lenses, lens barrels, lens lens shields, etc.

3. The stainless steel has excellent blackening effect at high temperature, has good corrosion resistance, wear resistance, and the blackening film binding force is very firm, and the surface layer of the treated workpiece has wear resistance, friction reduction, abrasion resistance, bite resistance, fatigue resistance, corrosion resistance and self-lubrication performance. It conforms to the national standard SGS, GB T15519, military standard WJ535-82, German standard DIN50938, American standard MIL-C-13924

<>1. Wet the surface of the dirt with water first, and evenly sprinkle the stainless steel cleaning powder on the black dirt.

2. Wait 3 minutes and wipe the black dirt with a damp towel or scouring pad.

3. After observing that the black dirt falls off quickly, rinse it with clean water, and the stainless steel surface will be as bright as new.

Other methods: 1. Toothpaste to remove black scale: squeeze out the toothpaste, wipe it on the surface of stainless steel, rub it back and forth on the surface with sandpaper, about 3 minutes, and then wash it with water.

2. White vinegar to remove black scale: add some white vinegar to the surface of stainless steel, use low heat to cook for a while, then the layer of black on the stainless steel will soon fall off, leave for two days, let acetic acid and iron oxide.

Sufficient reaction, it can be removed.

3. Baking soda.

To remove black scale: first mix baking soda and water in a ratio of 2:1, then apply it and let it sit for 5 minutes, then wipe it clean with a rag.

Dear, hello, I am happy to answer for you, stainless steel surface blackening treatment formula answer stainless steel discoloration is more through the oxidation phenomenon after pickling, stainless steel blackening potion is composed of a variety of chemical raw materials: sodium hydroxide 50g, sodium thiocyanate 10g, sodium chloride 1g, water 100g. In the detection of stainless steel, a kind of chemical is often used, which is Ni8 detection solution.

Authentic high-quality 304 stainless steel will appear red when it encounters Ni 8 detection solution, and some stainless steel that is not 304 will appear yellow or colorless when it encounters Ni 8 detection solution. The principle of detection of chemical testing is to detect the content of nickel inside the metal, and the element Ni in the metal can be detected by detecting the solution, but the specific content also needs to be detected by professional instruments. The Ni content of regular 304 stainless steel should be more than 8, and the Ni content of stainless steel materials such as 201 and 303 is less than 8.

When stainless steel products appear blackened, their aesthetics will be affected, so the blackening of stainless steel has become a very concerned problem. The common types of blackening of stainless steel are chemical black, oxidized black and carbonized black, etc., and different types of blackening such as noisy blackening have different treatment methods.

Chemical blackening treatment refers to the coating of a special black chemical coating on the surface of stainless steel, and then heating under the condition of high-temperature leather oak to produce a dense black film of the chemical coating, so as to achieve the purpose of anti-corrosion and aesthetics. Although this treatment method can make the surface black, its chemical coating has low transparency and cannot fully display the texture of stainless steel, so the black film on its surface may fall off in long-term use, affecting the aesthetics.

Oxide black treatment is to treat the surface of stainless steel into a black oxide film, which can completely retain the texture and metallic luster of stainless steel. In this method, sulfuric acid, oxidant and other solutions can be used to form a black oxide film layer on the surface of stainless steel, which has high hardness, high corrosion resistance and good wear resistance, which can effectively protect the surface of stainless steel and maintain its original appearance and texture, but there are also certain defects, such as the thickness of the oxide film and the speed of film formation.

The carbide black treatment is to heat the surface of stainless steel to a high temperature and react with carbon gas to form a carbide layer, making its surface appear black. This method is widely used, which can adjust the concentration and temperature of the carbide to achieve the effect of controlling the color number and uniformity, and the production is simple and the cost is low, but in this method, it is necessary to pay attention to the control of temperature and processing time.

In short, the selection of stainless steel blackening treatment method should be based on the specific needs, effects and requirements of early ignition, etc., to find a suitable method for treatment. It is worth noting that the cause of the blackening of stainless steel should also be judged before the treatment, so as to ensure that the treatment method is correct and effective, and avoid unnecessary waste and loss. <>

The common methods are:

1.Acid coloring method.

1) Molten dichromate method. The stainless steel parts were immersed in sodium dichromate molten salt solution, and fully stirred for 20 30min to form a black oxide film. Remove and cool and rinse with water.

The temperature of molten salt is 450 550, and when it is lower than this temperature, it cannot be sufficiently oxidized to achieve a black effect.

2) Chemical oxidation of chromate black. The process of color change of this coating is from light to dark, when changing from light blue to dark blue (or pure black), the time interval is only 0 5 1min, and if you miss this sweet spot, it will return to light brown, and you can only recolor after re-coloring. Curing treatment can improve abrasion resistance.

With a color locator, a uniform black oxide film can be obtained. The operation requirements are rigorous. This method, also known as the Inco method, has a history of several decades and was invented by the British.

After the process has been improved, it has been widely used and the benefits are significant. At present, compared with advanced countries, the main gap between China and advanced countries is the coloring of electronic monitoring equipment. This equipment has been used in industrial production abroad, and repeated colors can be obtained, while the use has not been reported in China, so the development of electronic monitoring equipment for coloring is a top priority.

2.Electrolytic oxidation.

Solution preparation: (dichromate methyl 20-40g l manganese sulfate 10-40g l boric acid 10-20g l ph3-4).The coloring film was soaked in 1O% HCI solution at 25C, and there was no color change and no falling off of the film layer within 5 min, indicating that the corrosion resistance of the film layer was good.

After electrolysis, 1Crl7 ferritic stainless steel is blackened with fast blackening speed, and then after hardening, the black oxide film is uniform, elastic and has a certain hardness. It is characterized by simple process, fast blackening speed, good coloring effect, good corrosion resistance, and is suitable for the surface blackening treatment of various stainless steels, so it is quite valuable.

Heat treatment method. It is carried out in special equipment, the film layer is firm, and the wear resistance is good; However, due to stainless steel, especially austenitic stainless steel, after QPQ treatment, it will not have the good anti-rust ability of the original untreated.

The reason for this is that the chromium content of the surface of austenitic stainless steel is damaged. This is because the carbon and nitrogen content will leach in the nitriding process, which is the precursor process of QPQ, resulting in the destruction of the surface structure. It is easy to rust, and the salt spray is only a few hours before it rusts.

Because of this weakness, it is not very practical.