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Wuxi Hengda Liquid-Purification Chemical Plant

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Stainless Steel Pickling And Passivation Gel Anti-corrosion Material Corrosion Resistance Made A Very High Demand

According to the experts for many years experience in the application of resin, and Stainless Steel Pickling and Passivation Gel production line of the process and anti-corrosion engineering research, for different applications of the media conditions used in the anti-corrosion materials were summarized, hoping to give Stainless Steel Pickling and Passivation Gel production line corrosion reference.

As the stainless steel has excellent corrosion resistance, wear resistance, toughness and good processing performance, is widely used in aerospace, marine, military, chemical, energy and household furniture, construction and decoration, transportation and other fields, market prospects Optimistic, and Stainless Steel Pickling and Passivation Gel process is stainless steel production and processing of an indispensable part of the product. Stainless acid pickling process selected pickling liquid is generally a mixture of a variety of acids, mainly sulfuric acid, nitric acid and hydrofluoric acid, these mixed acid is highly corrosive and has a strong oxidizing, corrosive medium temperature is also High, these anti-corrosion materials on the corrosion resistance made a high demand.

Stainless Steel Pickling and Passivation Gel project introduction

Stainless Steel Pickling and Passivation Gel principle is the use of acidic liquid, remove the pretreatment of steel surface oxide surface, remove the surface of the metal ions, it has a good finish. Pickling, pickling, washing, washing, etc., regardless of what process of pickling, Stainless Steel Pickling and Passivation Gel production line from the production process to waste water recycling system between the various links there is a strong corrosion status. Therefore, the choice of anti-corrosion material is directly related to the equipment, workshop floor, trench, waste water recycling system, such as the normal use of environmental protection. Commonly used pickling process is as follows:

(A) pickling process

(About 12 meters) → HF + HNO3 acid pickling section (about 14 meters) → cleaning section (three paragraphs about 8 meters) → drying (About 4 meters) → waste acid recovery → waste water treatment system

According to the above process of pickling process, the need for anti-corrosion treatment of the main places are:

1, acid (clear) washing steel tank and platform;

2, acid system (including the new acid system, acid cycle system, waste acid system tanks and pipes);

3, acid mist collection system (including the slot cover and collection pipeline);

4, the workshop of reinforced concrete floor (including equipment foundation floor), trench and pit.

(2) corrosion medium of Stainless Steel Pickling and Passivation Gel process

Stainless Steel Pickling and Passivation Gel process, each section has a different corrosive medium, provided by a steel company's pickling liquid medium conditions are as follows:

1, the original acid solution

Sulfuric acid: tank concentration of 150 ~ 300g / L, the temperature is <90 ℃, the concentration of 98% solution;

Nitric acid: tank in the liquid concentration of 100 ~ 200g / L, the temperature is <90 ℃, the original solution concentration of 65%;

Hydrofluoric acid: tank liquid concentration of 40 ~ 60g / L, temperature <65 ℃, the original solution concentration of 70%.

2, mixed acid

Nitric acid and hydrofluoric acid: the tank concentration of 40 ~ 60g / L, the temperature is <65 ℃.

3, waste water

Contains a variety of heavy metal ions, salts and fluoride ions of acidic wastewater.

4, exhaust

Containing HF, NO × exhaust gas.

From the above medium conditions can be seen, the corrosive media is very strong, especially sulfuric acid and nitric acid concentration and temperature is relatively high, with a strong oxidizing. China epoxy resin industry association experts stressed that so in the acid pickling process of media storage and use of media equipment on the anti-corrosion material requirements are high.

According to the above sections of different corrosive media, different sections of the equipment and the ground need different anti-corrosion treatment, experts on the specific anti-corrosion methods were summarized.


This place anti-corrosion treatment methods

1, acid (clear) wash tank body

All the trough are steel welded parts, inner and outer glass fiber reinforced plastic anti-corrosion, the internal thickness of not less than 6mm, the external two cloth a felt four oil;

Groove set PVC20 collision layer;

Groove on both sides of the grid grid grille platform;

2, acid system

Acid pump selection of high quality acid pump;

Acid pipe system of the pipeline material using glass fiber reinforced plastic;

Acid tank (such as aluminum cans), nitric acid acid tank (such as aluminum cans), hydrofluoric acid acid tank (such as glass steel), mixed acid with acid tank (such as glass steel), sulfuric acid cycle tank (such as Glass fiber reinforced plastic), mixed acid recycling tank (such as FRP), cleaning water circulation tank (such as glass steel), waste acid tank (such as glass steel).

3, acid mist collection system

Slotted, duct are used corrosion-resistant glass steel;

Slot cover connection with a special Q-shaped seal ring;

The duct is equipped with the corresponding flap valve and water seal joint;

4, floor, trench and pit

Workshop floor and equipment base corrosion protection using vinyl resin mortar floor;

Trench and pit foundation anti-corrosion using vinyl resin mortar to do isolation layer, lining the acid brick;

Stainless Steel Pickling and Passivation Gel production line of the ground and equipment of anti-corrosion, and now basically use fiberglass material, and made of fiberglass main raw material (resin) is the direct decision to anti-corrosion effect of the key, so the choice of resin is a direct impact on the corrosion life. Experts introduced under the years of experience in the application of resin, commonly used in several anti-corrosion resin corrosion resistance characteristics and use of induction.

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