1 min. reading

Expert Tips on Pickling and Passivation

When working with our customers, we explain how to care for steel and keep it corrosion-free for longer. Throughout our services, many questions come up. We’ve gathered the most common ones and asked one of our specialists to answer them.

Krystian Idzikowski

Question:

How can I remove stains during aluminum pickling?

Answer from Trawialnia's Technical Advisor:

Visible stains are caused by incorrect application and choosing the wrong product. When pickling aluminum, we recommend using the PROCAP A7 spray agent — a gel that won’t run off. Apply it with the M5 pump for an even mist of the agent.

Question:

How can I remove corrosion from a plate heat exchanger?

Answer from Trawialnia's Technical Advisor:

Surfaces that come into contact with water can face two problems: scaling and corrosion. Corrosion is caused by a chemical reaction — the water’s chemistry affects stainless steel (steel-water interaction). We recommend using:

PROCIV DER A1 80% in 45 °C,
PROCIV 600,

You can see the results in the images:

usuwanie korozji stali nierdzewnej za pomocą środka chemicznego PROCIV

usuwanie korozji stali nierdzewnej za pomocą środka chemicznego PROCIV - ujęcie 2

Question:

We have a 321 steel pipe that has been annealed after welding, leaving it covered in scale and discoloration. How do we remove this discoloration and passivate the welds?

Answer from Trawialnia's Technical Advisor:

We recommend a new product from Chimimeca's innovative range.
The pipe only requires pickling with Procap SN+.
Reaction time is 1 hour. After application, the agent dries quickly on the discolored areas, so after about 10 minutes, you should re-spray those spots. Ambient temperature: approx. 19°C.

Amazing and fast results with Procap SN+. When using standard products available on the market, the pickling process usually has to be repeated multiple times.