Delmet stainless steel excellence since 1949

PICKLING

Delmet has a wide range of systems, products and equipment for steel pickling, both automatic and manual. It provides a contract service at its production plants and also designs, manufactures and supplies customised systems for its customers.

PICKLING

Pickling is the process that uses chemical means to remove oxide flakes that are formed during hot processing in the presence of atmospheric oxygen: the final result is a product with a regular surface and uniform grey colour, in preparation for any subsequent passivation or electropolishing treatment.

Pickling is the simplest and cheapest method to obtain a decontaminated and homogeneous stainless steel surface that can guarantee the characteristics for which this alloy was used. The formation of the particular protective film that distinguishes stainless steel can only be formed correctly in the absence of the oxides and contaminants that pickling eliminates. Contaminated stainless steel that has not been pickled will corrode sooner or later - guaranteed!

Pickling and passivation treatments can be performed in accordance with ASTM A480 and ASTM 967 standards by immersion or spray using gels or liquids, with products completely free of or containing nitric acid, according to the customer's specifications.

DECONTAMINATION
The decontamination treatment eliminates ferrous and other metal contaminants from the surface of the stainless steel. The presence of these foreign materials on the surface interferes with the formation of the protective film, favouring potential corrosive triggers. The immersion or spraying of special solutions allows the complete removal of these pollutants without altering the original appearance of the product; compared to pickling, there is practically no material removed.

Decontamination always has a beneficial effect on the stability of the passivation of stainless steel and for this reason it is often improperly defined as passivation. Decontamination can be verified with specific reagents, compliant with the reference ASTMs, or with a cycle of wetting repeated over 24 hours .

However, when only small areas need to be treated,

such as in the vicinity of a weld, pickling pastes and gels applied by brushes can be used.
When you want to decontaminate a stainless steel surface from particularly tough oxides, you can use a product that allows complete removal, without however significantly altering the colour of the treated surface. A clean stainless steel surface without contamination will autonomously generate its own passive layer of chromium oxide when placed in contact with the oxygen in the air.
It is precisely this passive surface layer that gives this material its excellent characteristics of resistance to chemical attacks and corrosion in general. It is however possible to use chemical passivation to accelerate the formation of this protective layer.

Chemical passivation is not always necessary

but it is certainly recommended where the surfaces do not have abundant ventilation, such as inside pipes or in hermetically sealed reactors.
Our chemical pickling and passivation treatments are compliant with ASTM A380/06 and ASTM A967/99.
Passivation on an electropolished surface is not necessary due to the excellent surface oxide formation after the electropolishing step (ASTM 912/02).
Delmet has a wide range of plants, products and equipment to carry out steel pickling treatment, both automatic and manual, with a dedicated contract service at its production plants or through the creation and supply of customised plants at the customer's premises.

CONTRACT PICKLING

PICKLING TREATMENT

Delmet offers an efficient contract pickling service for stainless steel pickling in two different production plants, equipped with the most innovative equipment and using the most suitable treatments for your stainless steel: immersion pickling, spray pickling and localised manual treatment for small parts.
Pickling is carried out on steel objects and manufactured parts - up to 10 tons and 15 meters in length - with an express service, thanks to the processes that operate up to 24 hours a day, 6 days a week, but a contract service is also available at the customer's premises.
You also have the option to follow the progress of the work on the products remotely through our digital monitoring platform.

CLEAN ROOM AND ULTRA-PURE WATER For high quality processes such as those used for the nuclear, high vacuum, pharmaceutical or dive sectors, a clean room is used for the control and final packaging of stainless steel products.

The water used for the final rinse is also filtered by a resin system that guarantees its purity

Electrolytic Metal Deoxidation

Limitless solutions for the surface treatment of stainless steel

PICKLING PLANTS

Delmet stainless steel excellence since 1949

Over 70 years of experience in the study, design and manufacture of manual and automatic stainless steel pickling plants.

Delmet manufactures both “traditional” immersion pickling plants, using tanks, and pickling plants with the new spray technique.

PHOTOGALLERY

CHEMICAL PRODUCTS

First name Subtitle Category Instructions Safety Data Sheets
Picklers > Nitric
Instructions for Use
Decontaminants
Instructions for Use
RUST KILLER
Decontaminants
Instructions for Use
ECOINOX BA
Super fast pickling liquid for austenitic steels
Picklers > Nitric
Instructions for Use
ECOINOX SPEEDY
Picklers > Nitric
Instructions for Use
Picklers > Nitric
Instructions for Use
G-SPEEDY SPRAY
Pickling gel for AISI 300 series stainless steel
Picklers > Nitric
Instructions for Use
Picklers > Nitric
Instructions for Use
G-SPEEDY
Pickling gel for stainless steel (AISI 300 series)
Picklers > Nitric
Instructions for Use
Picklers > Non-Nitric
Instructions for Use
Picklers > Non-Nitric
Instructions for Use
Picklers > Nitric
Instructions for Use
Picklers > Nitric
Instructions for Use
Picklers
Instructions for Use
ECOGEL
Gel decapante pronto all'uso specificamente studiato per l’acciaio INOX serie AISI 300
Picklers > Nitric
Instructions for Use

ELECTROPICKLING

PORTABLE

Portable stainless steel electropickling systems are a technological revolution for cleaning welds.

With the portable DLT & CGT electropickling system it is possible to electroclean, pickle, electropolish and passivate the welds on stainless steel, duplex and super duplex products with immediate and safe results.


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DO YOU NEED OUR SERVICES?

Delmet is able to solve any query and problem related to the surface treatment of stainless steel.

It offers contract processing, design and manufacture of customised plants, formulation and sale of chemicals and machines for the purification of process water and air treatment.

If you need more information or want to speak to one of our managers, fill out the request form and you will be contacted shortly.

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