Passivating pipelines and tanks
For media-carrying systems, tanks, pump circuits and spray-ball applications.
Recommended solution:
CitriSurf® 3250
CitriSurf®
Passivating stainless steel in industrial plant engineering
CitriSurf® for stainless steel in industrial plant engineering: suitable solutions for pipelines, tanks, surfaces, weld seams and small parts. With CitriSurf 3250, 2210, 2250, 3050 and KleerKleen 4002
Industrial plant engineering
Passivating stainless steel in industrial plant engineering: for pipelines, tanks, surfaces and components
CitriSurf® offers citric-acid-based solutions for cleaning and passivating stainless steels, matched to pipelines, tanks, weld seams, surfaces and smaller components in immersion baths.
Suitable for: pipelines, tanks, fittings, weld seams, surfaces and small stainless-steel parts
Suitable solutions:
CitriSurf® 3250 for pipes and tanks, CitriSurf® 2210 for surfaces, CitriSurf® 2250 or 3050 for immersion-bath processes
Important upfront:
Pre-cleaning, suitable rinse water and coordination with material, geometry and process
Industrial plant engineering
Which stainless steel do you want to passivate?
First select the appropriate application. This helps users and plant operators find the right solution for plants, components and systems in the process industry more quickly.
Passivating surfaces, weld seams and large components
For large stainless-steel surfaces, housings, claddings, machine parts and areas that cannot be treated in an immersion bath.
Recommended solution:
CitriSurf® 2210
Passivating small components in an immersion bath
For springs, fasteners, closures, smaller fitting components and other stainless-steel parts in series or batches.
Recommended solution:
CitriSurf® 2250 or CitriSurf® 3050
Industrial plant engineering
When each CitriSurf product is suitable
| Use Case | Recommended product | Brief Explanation |
|---|---|---|
Pipelines, tanks, pump systems |
CitriSurf 3250 | Foam-controlled solution for pipelines, tanks and circulating systems |
Surfaces, weld seams, large components |
CitriSurf 2210 | Gel for surfaces and objects that cannot be treated in an immersion bath |
Rust on surfaces or maintenance use |
CitriSurf 2310 | Rust removal and passivation in one step |
Small components, martensitic steels |
CitriSurf 2250 | Suitable for small components and materials with higher carbon content |
Small components, V2A/V4A and other stainless steels |
CitriSurf 3050 | Foam-controlled immersion-bath solution for stainless steels |
Pre-cleaning before passivation |
KleerKleen 4002 | Highly alkaline pre-cleaning to support passivation |
Industrial plant engineering
The most important CitriSurf products for industrial plants
CitriSurf 3250
For pipelines, tanks and circulating systems
CitriSurf® 3250 is a foam-controlled solution for cleaning and passivating stainless steels in pipelines, tanks and comparable plant systems. The product is particularly suitable for applications with pump systems or spray-ball processes.
Suitable for
· pipelines
· tanks
· circulating systems
· media-carrying plant areas
Request CitriSurf 3250
CitriSurf 2210
For surfaces, weld seams and large components
CitriSurf® 2210 is a passivation gel for treating surfaces. Its viscosity enables application on weld seams, housings, claddings and large-area objects that cannot be passivated in an immersion bath.
Suitable for
· surfaces
· weld seams
· large objects
· housings and claddings
Request CitriSurf 2210
CitriSurf 2250
For small components in an immersion bath
CitriSurf® 2250 is designed for smaller stainless-steel parts in an immersion bath. The product is particularly relevant when small components are treated in batches and material selection requires targeted coordination.
Suitable for
· springs
· fasteners
· closures
· smaller series components
· martensitic stainless steels
Request CitriSurf 2250
CitriSurf 3050
For immersion-bath processes with stainless steels
CitriSurf® 3050 is a foam-controlled solution for cleaning and passivating stainless steels in bath processes. The product fits standardized batch and series processes.
Suitable for
· V2A and V4A
· stainless steels in immersion baths
· series and batch processes
Request CitriSurf 3050
KleerKleen 4002
For pre-cleaning before passivation
KleerKleen 4002 is a highly alkaline pre-cleaner for stainless-steel surfaces. Pretreatment supports passivation when oils, greases and other residues must be safely removed before the actual process.
Suitable for
· pre-cleaning before CitriSurf processes
· contaminated stainless-steel surfaces
· preparatory cleaning in the process
Request KleerKleen 4002
For maintenance and special cases
CitriSurf® 2310 is suitable for rust removal and passivation on surfaces. CitriSurf® 77plus is a supplementary solution for smaller service cases. CitriSurf ® 8050 is intended for special applications such as derouging and descaling.
Industrial plant engineering
What ASTM A967 and AMS 2700 mean in the context of passivation
ASTM A967 and AMS 2700 are technical references for the chemical passivation of stainless steel. For users in industrial plant engineering, they are particularly relevant when processes must be specified, documented and tested.
Standards do not replace individual process design. Material, geometry, pre-cleaning, process control, rinsing quality and testing must be matched to the specific component and its later application.
ASTM A967
ASTM A967 describes chemical passivation procedures for stainless-steel parts. The standard addresses passivation itself, but also includes cleaning, descaling and test methods to confirm effectiveness.
Practical relevance
ASTM A967 serves as a technical reference framework for process description, test planning and documentation.
AMS 2700
AMS 2700 describes the requirements for procedures used to remove free iron or other less noble contamination from corrosion-resistant steels.
Practical relevance
AMS 2700 becomes especially relevant where processes must be clearly specified and released.
Industrial plant engineering
What should be clarified before passivation
1.
Pre-cleaning
Oil, grease, machining residues and other contamination should be removed before passivation. In many cases, highly alkaline pre-cleaning is decisive for the result.
2.
Material and geometry
Product selection depends on whether surfaces, pipelines, tanks or small components are treated and which stainless-steel grade is present.
3.
Rinse water and drying
Rinse quality, drying, and process control are important factors for achieving a clean result. The drying phase should last at least one hour to ensure optimal passive layer formation.
4.
Testing and release
If internal specifications or customer requirements apply, passivation should be technically coordinated in advance.
FAQ
Frequently asked questions
CitriSurf is suitable for these applications.
For large surfaces and weld seams, CitriSurf ® 2210 is the appropriate main solution. If rust spots are present, CitriSurf ® 2310 is relevant.
Depending on the stainless-steel type, CitriSurf ® 2250 or CitriSurf 3050 may be suitable.
In practice, suitable pre-cleaning is often decisive for a good result.
CitriSurf ® is aligned with procedures according to ASTM A967 and AMS 2700. For practical application, material, process control and testing requirements must also be considered.
Consulting & Contact
Have the material, component geometry, pre-cleaning, and process requirements evaluated together. This will help you quickly determine whether CitriSurf 3250, 2210, 2250, 3050, or KleerKleen 4002 is the best fit for your application.
How can CitriSurf® be ordered?
Exclusively from MKK GmbH, Oldenburg
Order by email: order@citrisurf.de
Please note:
- Provide your VAT ID
- Billing address and delivery address required
- Orders before 12:00 noon: usually shipped on the next working day
- Delivery date = shipping date (transit times depend on the logistics provider)