TH14955A - Process for immersion and de-rusting of steel, inert to the reaction without using nitric acid. - Google Patents

Abstract

The stainless steel immersion process consists of adding the material to be treated in a bath that maintains a temperature range from 30C to 70C with the following initial mixture: a) H2SO4 at least 150 g / L b) Fe34 at least 15 g / l c) HF at least 40 g / l d) H2O2 at 35% by volume added to a known stabilizer of 1-20 g / l. L e) Emulsifier, wetting agent, abrasive. Protective agent The following substances are continuously entered into the immersion bath: - At least 3 m3 / h of air flowing at least. M per m 3 infusion volume and stabilized H2O2 in an adjusted dose to maintain the bath's redox potassium at> 250 mV:

Claims (1)

1. The soaking process of non-rusting steel consists of adding the material to be treated in a temperature-maintained bath in the range from 30C to 70C containing the following initial mixture: a) H2SO4 at least 150. G / l b) Fe34 at least 15 g / l c) HF at least 40 g / l d) H2O2 at 35% by volume with a known stabilizer of 1-20. G / l e) Non-ionic surfactant type additives (emulsifiers, wetting agents, abrasives) as well as creases. Resists acid erosion: approx. 1 g / l in total.