Pickling and passivation of stainless steel in Brno
Dimensions and capacities
Offered operations
Standards
Handling and packaging
Materials
Quality, audits, certificatesPickling ensures perfect removal of impurities, oxides and weld defects from the material surface. This process increases not only the aesthetic quality of the steel, but also its corrosion resistance. As a result, its service life is significantly extended.
Pickling can be carried out by immersion in pickling baths or spraying. Subsequent passivation can be carried out in the same way. If necessary, we will also provide degreasing of the parts and preparation of the surface for immersion in the bath.
Pickling can be carried out by immersion in pickling baths or spraying. Subsequent passivation can be carried out in the same way. If necessary, we will also provide degreasing of the parts and preparation of the surface for immersion in the bath.
Dimensions and capacities
The following baths are available for pickling by immersion:
| Length (mm) | Depth (mm) | Width (mm) | Number |
| 12,500 | 2,000 | 2,000 | 1 bath |
| 10,000 | 3,000 | 2,000 | 1 bath |
| 10,000 | 2,000 | 2,000 | 2 baths |
Dále je k dispozici vana na oplach dílů po moření o rozměrech:
| Length (mm) | Depth (mm) | Width (mm) | Number |
| 10,000 | 2,000 | 2,000 | 1 bath |
A vana s pasivačním roztokem o rozměrech:
| Length (mm) | Depth (mm) | Width (mm) | Number |
| 10,000 | 2,000 | 2,000 | 1 bath |
Spray box: Parts that cannot be pickled by immersion due to large dimensions, unsuitable shape, structural details or combination of materials are pickled here. The limit is the size of the door, which is 5,000 mm wide and 5,000 mm high.
| Length (mm) | Depth (mm) | Width (mm) | Number |
| 20,000 | 8,000 | 8,000 | 1 box |
Offered operations
Pickling of stainless
Pickling of stainless steel ensures perfect removal of impurities, oxides and weld defects from the material surface. This process increases not only the aesthetic quality of the steel, but also its corrosion resistance. As a result, its service life is significantly extended.
What is stainless steel pickling and why is it so important?
- No more oxidation or impurities: During production, processing and welding, stainless steel is often subject to oxidation, the formation of areas affected by heat, impurities that can negatively affect its appearance and corrosion resistance. These problems can be solved by pickling, which effectively removes surface defects so that the steel surface is clean and uniform.
- The material will be corrosion resistant: After chemical pickling, a natural protective layer of chromium oxide is restored on the surface of the stainless steel to protect the material from the action of aggressive substances. The steel will thus not be prone to degradation in harsh conditions.
When should stainless steel pickling be considered?
- After welding and heat treatment: During welding, thermal changes occur on the steel surface and can lead to oxide formation and discoloration. Pickling effectively removes these traces, returning the material to its original quality.
- Before other surface treatment: When applying other surface treatments such as passivation, painting or polishing, it is necessary to ensure perfect surface cleanliness so that subsequent steps achieve perfect results.
- To restore older material: Even after prolonged use of stainless steel, pickling can restore both the appearance and quality of the material.
Stainless steel passivation
Stainless steel passivation is a process by which the level of corrosion resistance of a material is significantly increased. This process restores and strengthens the natural protective layer of chromium oxide on the steel surface. The result of passivation is a material that resists adverse environmental influences.
What is stainless steel passivation and why is it so important?
- The protective layer is restored: During processing, welding or pickling, the natural passive layer of chromium oxide on the surface of stainless steel can be disrupted. Passivation restores this protective film. It forms a layer on the surface to protect the steel from chemical influences, moisture and other adverse effects. The material thus achieves its maximum functionality.
When is passivation of stainless steel necessary?
- After pickling and mechanical working: After processes such as pickling, polishing and welding, the natural protective layer of steel can be damaged. Passivation is necessary to restore it; it ensures protection of the material.
- The material is used in aggressive conditions: If stainless steel is exposed to adverse conditions such as moisture, aggressive chemicals or extreme conditions, then passivation of the material is necessary. Passivation helps increase resistance and minimize the risk of corrosion.
- To ensure long-term protection: Even with new materials, passivation can ensure that the surface is protected and resistant to external influences for a long time.
Degreasing stainless steel
Degreasing stainless steel is an indispensable step before any further surface treatment. This process ensures that oils, grease and other impurities are removed from the surface. As a result, the adhesion and quality of subsequent treatments, such as painting, passivation and pickling, are significantly increased.
Why is degreasing so important?
- Removal of oil and impurities: Oils or dust may settle on the surface of stainless steel during metal production, processing or storage. These impurities hinder the quality of further surface treatments, so their thorough removal is essential.
- Improvement of adhesion of surface treatment: Clean and degreased metal has better adhesion of paints, protective layers and other chemical treatments.
- Prevention of defects and corrosion: Dirty surfaces can be more prone to the formation of defects such as stains, paint peeling or even corrosion.
When is metal degreasing needed?
- Before painting and surface treatment: Degreasing is necessary before any application of paint, coating or protective layer to achieve uniform application and maximum adhesion.
- Before chemical processes: In processes such as pickling and passivation, it is necessary to ensure that the surface of the metal is completely clean. A degreased surface and careful work guarantee an optimal chemical treatment result.
- After processing or storage: Oil and lubricant deposits often form on the surface during production, machining or metal handling and need to be thoroughly removed before further steps can be taken.
Hydrogen removal
Hydrogen removal – a process that helps remove unwanted hydrogen from metals, especially after chemical and heat treatments. This step is necessary to increase the material’s resistance to brittle fracture. The stainless steel will thus be able to withstand adverse factors in harsh operating conditions.
What is hydrogen removal and why is it so important?
- Prevention of hydrogen embrittlement: During chemical operations, welding or heat treatment, hydrogen can be absorbed into the metal structure. Excess hydrogen causes the material to become brittle, leading to cracks and fracture under heavy loads. Hydrogen removal gets hydrogen out of the material, preventing these defects.
- Increasing strength and service life: The hydrogen removal process ensures that metal components remain strong and durable even under prolonged mechanical stress. This step is particularly crucial for parts subjected to high pressures or dynamic loads.
When is hydrogen removal from metal necessary?
- After chemical treatment of a surface: Chemical processes often lead to hydrogen saturation of metals and their subsequent embrittlement. Removing hydrogen restores strength to the material.
- After heat treatment or welding: At high temperatures, the material can absorb hydrogen. Hydrogen removal eliminates the risk of cracks and ensures long-term stability.
- For critical components: In the case of metal parts used in harsh conditions, such as those in the automotive, power and engineering industries, hydrogen removal is a key step in maintaining their performance and safety.
Oxygen purity cleanin
Oxygen purity cleaning is a service that ensures the removal of all impurities, grease and residues that could negatively affect materials that are used in environments with pure oxygen or other technical gases. This process reduces the risk of hazardous reactions and is therefore essential for the safe and efficient operation of equipment where such gases are used.
What is oxygen purity cleaning and why is it so important?
- Oxygen safety: Even small amounts of organic pollution, such as oils or grease, can cause dangerous reactions, including fires or explosions, in contact with oxygen. Oxygen purity cleaning ensures that metal surfaces are completely free of these impurities and ready for safe use, for example in medical facilities, power systems and the chemicals industry.
When is oxygen purity cleaning necessary?
- For oxygen systems and components: All components in contact with pure oxygen, such as hoses, valves, pipes and vessels, must undergo an oxygen purity cleaning process to prevent hazardous reactions.
- In the medical and chemical industry: Oxygen purity cleaning is required in medical applications, where maximum purity is necessary to protect the patient, as well as in the chemical industry, where systems are exposed to aggressive environments.
- Before use in harsh environments: Wherever there is a risk of ignition or explosion in contact with oxygen.
Standards
- ASTM A380/A380M – Cleaning, descaling and passivation of stainless steel parts
- ASTM A967/A967M – Chemical passivation treatments for stainless steels
- AMS 2700 – Passivation of corrosion-resistant and stainless steels for the aerospace industry
- DIN EN 2516 – Passivation of corrosion-resistant and stainless steels in the aerospace industry
- CSN EN 2516 – Passivation of corrosion-resistant and stainless steels
Handling and packaging
The goal of each technological process is to optimize the final product with respect to the cost of the process performed. For this reason, we carry out all work in our pickling shop in several modes, which differ in the manner of inspection, handling of parts and packaging. The procedures described above can be performed for all types of structures, material grades, technological procedures with regard to the composition of the pickling bath, pickling length, bath temperature, etc.
Special mode
If we accept a job for which each part is wrapped separately (in mirelon, bubble wrap, etc.), we process the job in Special mode. We also choose this mode whenever the order states for example: visible part, special treatment, do not scratch, carefully, etc. It is suitable and almost always used by customers from the aerospace, nuclear and automotive industries.
Materials
- Austenitic stainless steel
- Martensitic and ferritic stainless steel
- Advanced materials (duplex, superaustenitic, superferritic and superduplex steel)
- Aluminium
- Light metals (copper, brass)
- Nickel and titanium alloysiny
- Other materials on request
Quality, audits, certificates
The resulting surface after pickling and passivation is degreased, clean, free of corrosion, paint buildup, scale after welding, buildup and abrasion of carbon material and pickling and passivation residues. Pickling, however, does not remove slag, burnt grease in welds, deep inclusions of carbon material, impurities ground into the surface, baked-on protective film residues, markings and other flaws. Pickling can also not achieve a uniform or repeatable surface appearance. A common phenomenon of pickling is that the surface becomes matt and the surface roughness increases.
The final surface quality is supervised by our team of technicians from the quality department. On request, they will issue a report on performance of work on the order, according to CSN EN 10204 – Declaration of Conformity with the Order. If necessary, it is possible to agree with the quality manager on the issuance of an Inspection Certificate according to CSN EN 10240. It is necessary to know according to what standard you require the test and to have defined parameters for it. Learn more about testing in our blog articles.
The final surface quality is supervised by our team of technicians from the quality department. On request, they will issue a report on performance of work on the order, according to CSN EN 10204 – Declaration of Conformity with the Order. If necessary, it is possible to agree with the quality manager on the issuance of an Inspection Certificate according to CSN EN 10240. It is necessary to know according to what standard you require the test and to have defined parameters for it. Learn more about testing in our blog articles.
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