IST International Surface Technology

, Volume 5, Issue 3, pp 34–34 | Cite as

Fast Cleaning Process with No Stains

  • Georg Hesel
Cleaning & Pretreatment Multimetal Cleaner for Use with Cold-Spray and High-Pressure Systems

Special additives in a new cleaning agent prevent stains and inadequate drying, together with attacks on aluminium, even in unfavourable conditions.

Cleaning baths contaminated with oils and cooling lubricants can often cause stains to form on parts after the drying process. This is not only a problem with the appearance of the components, but can also lead to corrosion and to cleaned parts being rejected when their dimensional accuracy is measured.

Aluminium parts with iron mounting bolts. Left: untreated part. Centre: part cleaned under normal conditions. Right: part exposed to the cleaning agent for 30 minutes.

Stains can also form during vacuum drying when traces of the cleaning solution remain in blind holes and there is a delay in the solution coming to the boil because of the vacuum. The result is that the liquid sprays out of the hole and is distributed over the surface of the part. Stains form on the surface and the part may remain damp after the drying process.

The cleaning agent manufacturer Chemische Werke Kluthe has developed a new cleaner (Hakupur 800) which resolves these problems. Special additives prevent stains from occurring and ensure that the parts are completely dry.

Inorganic salts are not used in the new cleaner. The glycols that it contains have a very good wetting effect, which allows a uniform film of corrosion protection to form and, at the same time, guarantees that the parts dry quickly with no residues remaining.

The combination of glycols is designed to produce good cleaning and wetting results across the entire temperature range, as well as almost completely suppressing foam at high spraying pressures.

Benefits of the new cleaning agent

  • Has a pH of between 8 and 9, is very mild and causes no problems in terms of occupational physiology.

  • Corrosion level of 0 at a 2 % concentration in accordance with DIN 51360 part 2.

  • Fully compatible with aluminium. At a 2 % concentration, causes no discolouration on the surface even at a temperature of 60 °C and with a longer processing interval.

  • Suitable for use with non-ferrous metals.

  • Dries quickly and without residues. Ideal for vacuum drying systems.

  • Very good wetting ability.

  • Suitable for cold and high-pressure spraying.

  • Demulsifies spontaneously and thoroughly.

  • Contains no inorganic salts.

  • Contains no boron.

  • Resistant to bacteria.

  • Cost-effective and energy-saving, can be used at room temperature.

Kind to delicate aluminium

Sensitive aluminium alloys are often subject to attacks during the cleaning process and can darken in colour or even turn black. These changes to the surface of the material are not only a visual problem, but can also cause the surface of the parts to become brittle or lead to the parts being rejected before subsequent painting or bonding processes. This occurs in particular in the case of high cleaning temperatures and long processing times or when parts remain in contact with the cleaning solution for a long period because the cleaning bath has been shutdown or because they are left suspended in the vapour space above the bath. The new cleaner also resolves these problems and effectively inhibits the aluminium, even at high temperatures and during long processing intervals.

Resistant to bacteria and energy-saving

The cleaning agent is demulsifying, which allows the oil to be skimmed off the surface during maintenance of the cleaning bath. Because it is also resistant to bacteria, the cleaner can be used at low temperatures (room temperature) and this helps to reduce energy consumption.

Copyright information

© Springer Fachmedien Wiesbaden 2013

Authors and Affiliations

  • Georg Hesel
    • 1
  1. 1.Chemische Werke Kluthe GmbHHeidelbergGermany

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