Cleaning and Care
Section 7
Special Care Instructions
Page 21
Tray transport trolley
91275972_A1
TTW/V
7.4
Special Care Instructions
Resistance to corrosion in stainless steels is provided by a passive layer which is formed on the surface
when oxygen is absorbed. The oxygen in air is sufficient to form the passive layer, so that damage caused
by physical action is eliminated automatically.
The passive layer develops or is renewed more quickly when the steel comes into contact with water con-
taining oxygen. The passive layer can be chemically damaged or breached by agents which have a reduc-
ing (oxygen-consuming) effect when they come into contact with steel at concentrated levels or at high
temperatures.
Such aggressive substances include:
§
substances containing salt and sulphur
§
chlorides (salts)
§
seasoning concentrates (e.g. mustard, vinegar essence, seasoning cubes, saline solutions)
Further damages can occur due to:
§
extraneous rust (e.g. from other components, tools or rust film)
§
iron particles (e.g. grinding dust)
§
contact with non-ferrous metals (element formation)
§
lack of oxygen (e.g. no admission of air, low-oxygen water).
General working principles for handling appliances made of "refined stainless steel":
§
Always keep the surface of appliances made from stainless steel clean and open to air.
§
Use cleaning agents suitable for stainless steel. Never use bleaching cleaning agents or any con-
taining chlorides.
§
Remove layers of lime scale, grease, starch and egg-white by cleaning daily. Corrosion may occur
underneath these layers due to lack of air absorption.
§
After each cleaning operation remove all cleaning agent residues by wiping thoroughly. The surface
should be thoroughly dried after wiping.
§
Do not bring parts made of stainless steel into contact with substances such as concentrated acids,
seasonings and salts for longer than is absolutely necessary. Acid fumes emitted when tiles are
cleaned also cause corrosion in "refined stainless steel".
§
Avoid damaging the surface of the stainless steel, especially by bringing into contact with metals
other than stainless steel.
§
Residues from other metals produce extremely small amounts of chemical elements which can
cause corrosion. Contact with iron and steel must be avoided at all costs, because it will cause ex-
traneous rust. If stainless steel comes into contact with iron (steel wool, steel particles from pipes,
water containing iron), this can trigger corrosion. You must therefore use refined steel wool or
brushes with natural, plastics or refined steel bristles only for physical cleaning. Steel wool or brush-
es with unalloyed steel cause extraneous rust due to abrasion.
