Topic: News

“Stainless Steel can’t get rusty

Stainless Steel Cannot Rust

A component made from stainless steel can be compared to a healthy apple that keeps for a long time thanks to its peel, which is less than a tenth of a millimetre thick, but no substances are able to escape or enter – until a worm eats its way through the peel, triggering the rotting process. The flesh of the apple will also oxidise quickly when the apple is cut in half.

The ‘skin’ on stainless steel is much thinner than apple peel yet also provides complete enclosure, which is why, normally speaking, no metal ions can escape and no foreign substances can enter. However, if this skin is exposed to an excessive chemical load, it will break down, leading to corrosion. The biggest difference from the apple is the ability of stainless steel to repair its oxide layer by itself. This is particularly applicable when the layer is damaged mechanically and the chromium oxide layer disappears in local areas.

Thanks to the oxygen in the air, passivation of the material will occur spontaneously in those areas through the formation of a new layer of chromium oxide. This is known as the ‘self-healing effect’ although this mechanism can be badly disrupted in the presence of chlorides.

The Solution

It is vital that stainless steel products and fabrications are clean when they go into service and kept clean whilst in service. In particular weld areas must be free from de-colourisation and contamination plus any mild steel contamination that may have occurred during fabrication must be completely removed.

Dirt Deposits

Stainless steel must be able to ‘breathe’ as it exists thanks to oxygen. Although oxygen serves to maintain the thickness of the oxide layer, Oxygen is a relatively large molecule however and must be in contact with the surface. This is obviously not a problem when the surface is clean…those places not exposed to rain are particularly susceptible to under deposit corrosion.

DR121 Kit

The DR121 Cleaner & Conditioner

The DR121-CL is a special deep cleaner that removes contamination such as oxides/rust from stainless steel surfaces in a single operation.

It is a white viscous liquid based on organic acids and surface active agents and does not contain abrasives. It is suitable for the intensive cleaning of contaminated surfaces like flash rust and rusty areas, also known as ‘tea-stains’. It is not a pickling agent because it does not attack the metal. It is therefore non-aggressive for metals but very effective on oxides and dirt.

The DR121-CD completely removes any residues left after the use of DR121-CL and passivates the surface which helps to prevent further corrosion.

Due to the deep-cleaning characteristics of DR121, the danger of ‘under-deposit corrosion’ of stainless steel is also reduced. This form of corrosion occurs under deposits because oxygen access is limited. This is particularly important in chloride environments such as swimming pools or marine applications. Ground or polished surfaces are also more susceptible to this phenomenon.

Rust remover for removing rust and rust spots from stainless steel and other metals.

DR121 is a special deep cleaner that removes oxides like rust from stainless steel. It is a white viscous liquid with a pH value of 3 consisting of organic acids and surface-active agents: it is free from abrasive particles. DR121 is suitable for the intensive cleaning of contaminated surfaces like flash rust and other rusty areas, also known as ‘tea-stains’. To remove rust was never as easy as now. It is certainly not a pickling agent, so it does not attack the metal. DR121 is therefore non-aggressive for metals, but very effective on oxides and dirt.

Our rust remover DR121 is a 100% organic cleaner

This product is also unique because it is 100% organic, so it is without danger to people and environment. So DR121 even is suitable for cleaning machines used in the food sector.

More than a stainless steel cleaner

Although DR121 was originally developed for removing rust from stainless steel, it has become apparent that it also gives good results on other metals like copper, aluminium and even plain steels. In the last mentioned case one must not use DR121. Common white corrosion spots on aluminium can also effectively be removed using this product.

Published by: neiljones on: August 5th 2016