Hydropower Discover Solutions

Advantages
at a glance

Design - Surface creates.

Corrosion - Surface protects.

HOT-DIP GALVANIZING

Process

The process is divided into eight steps: set up, degreasing, pickling, fluxing, drying, hot-dip galvanizing, post-treatment and dismounting.

1. Set up

Incoming goods inspection and preparation for efficient galvanizing processing.

2. Degreasing

Cleaning oils and contaminants using industrial chemical solutions.

3. Pickling

Removing rust and scale through acid treatment process.

4. Fluxing

Flux bath improves zinc adhesion and surface preparation.

5. Drying

Drying the material before immersion into molten zinc.

6. Hot-dip galvanizing

Steel is immersed into molten zinc for corrosion protection.

7. Post-treatment

Cooling and finishing process for enhanced coating durability.

8. Dismounting

Final unloading and quality inspection before delivery.

WHAT WE STAND FOR

Always moving,
always ahead

As a technology leader, we power progress in industries across the globe. As a family-owned company, we take responsibility for ensuring that progress and sustainability go hand in hand.

Learn more about Prommada
Which standard does Prommada galvanize to? +

Prommada galvanizes in accordance with DIN EN ISO 1461. This standard defines requirements and tests for batch hot-dip galvanized fabricated steelwork; Prommadaadditionally anchors this in its own quality management system. In addition, our kettles use a DASt 022-compliant bath composition..

Does Prommada offer logistics services (collection/delivery/to site)? +

Yes. Prommadaorganizes collection, picking/commissioning, post-processing and delivery; if required, also daily deliveries or deliveries close to/at the construction site.

How does the galvanizing process at Prommada work? +

In eight steps: set-up, degreasing, pickling (with separated pickling management), fluxing, drying, hot-dip galvanizing, post-treatment, dismantling. Pre-treatment is enclosed. Our galvanizing is free of SVHC substances and POP substancesand fully complies with REACH, RoHS, etc..

Is there a post-treatment against white rust? +

Yes. At many Prommada sites, preservation/passivation is available on request; it maintains the shine and reduces early formation of white rust..

Does Prommada galvanize small parts as well as large structures and series production? +

Yes. From single items to series and from small parts to space-consuming structures – Prommadacovers the full spectrum. The largest dimensions that can be galvanized in Feuchtwangen are 16.80 m (length), 1.70 m (width) and 3.00 m (height), with a maximum weight of 8 t.

Do welding sprays affect galvanizing quality? +

Yes. Anti-spatter agents—especially silicone-containing welding sprays—can prevent wetting of the steel and lead to adhesion issues, black spots or missing zinc coating in the heat-affected zone. In the heat-affected zone, i.e., around the weld seam, residues burn off. Deposits next to the seam often remain problematic. Recommendations: • Avoid sprays, pastes and release agents wherever possible. • If necessary, use only silicone-free, water-based products—still remove residues completely. • Before galvanizing, remove weld spatter, scale and spray residues mechanically (e.g., blasting/grinding) or with suitable cleaners. The basis is the requirement of DIN EN ISO 1461 that surfaces to be galvanized must be metallically clean and free of non-metallic contamination. Prommadacoordinates the appropriate pre-treatment on a project-specific basis.

What service life is realistic? +

Depending on zinc coating thickness and environmental conditions, protection periods of several decades are possible. The International Zinc Association assumes a service life of 66 years.

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