DE I EN I FR

Each form has its natural function

Pickling frees the part of scale and other impurities. Metals which can be treated with the ElpoChem pickling process include:

• Stainless steel
• Steel
• Copper and copper alloys
• Aluminum
• Titanium and titanium alloys
• and others

Pickling imparts lasting improvement to the corrosion resistance. After proper pickling, surfaces and welded seams are metallically blank and free of scale layers and temper colors.

Chemical composition of scale and welded seams
(schematic representation)

1. Fe2O3 layer, poorly soluble in acid

2. Fe3O4 layer, more acid soluble

3. FeO layer, dissolves well in acid

4. Metal substrate

Chemical pickling

Pickling can be performed by spraying the pickling or by immersing the part in a bath. The dwell time ranges from a few minutes to several hours.

Anodic pickling

With anodic pickling, the removal takes place with the application of direct current in specially equipped plants.

ElpoChem supplies pickling chemicals in the following forms:

• Pickling pastes: for cost-effectiveness treatment of welded seams for scale and temper colors
• Pickling sprays: for treating components with large surfaces
• Bath pickling: for immersion, sprinkling, pumping and use in spray chambers for pickling