component itself in a first step an acid treatment is carried out using for example nitric acid hno 3 and or phosphoric acid h 3 po 4 further acids e g sulfuric acid sulfurous acid nitrous acid carbonic acid hydrofluoric acid etc and or acid mixtures are conceivable and are matched to the particular salt bath after possible further watering and drying by way of example at least one further treatment is carried out using hydrochloric acid hcl as second acid bath other acids are conceivable for the optional second acid bath but they differ from the acids of the first acid bath the treatment in the second acid bath can also be carried out at a temperature between 18 to 25 u00b0 c especially at a temperature of 21 u00b0 c for example after one for example each treatment with acid watering and or drying is carried out the individual treatment steps in which the component comes into contact with the salt bath or the various acids as well as the watering and drying can in each case be repeated a number of times fig3 shows an apparatus 22 with which the method according to the invention can be carried out the apparatus 22 comprises a vessel 19 in which there is a liquid salt or salt mixture or an acid the method can be shortened and or improved if an ultrasound probe 16.