Premium
Kann das Beizen von Schweißnähten austenitischer CrNi‐Stähle durch andere Verfahren ersetzt werden?
Author(s) -
Münster R.,
Spähn H.
Publication year - 1979
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.19790100206
Subject(s) - pickling , metallurgy , welding , austenite , materials science , hydrochloric acid , corrosion , nitric acid , microstructure
Can Pickling of Weld Seams of Austenitic CrNi‐Steels be Replaced by Other Methods of Surface Treatment? After heat treatment or welding stainless steels, scale resp. slag will remain on the surface so that the corrosion resistance of such passivating steels is distinctly lowered. In order to avoid this it is common practice to pickle all weld seams and their surroundings or even the whole apparatus. Pickling solutions for austenitic stainless steels are mixtures of hydrochloric acid, nitric acid, sulphuric acid and hydrofluric acid with water. For reasons of environmental protection it became desirable to use other surface treatments. This leads to the question whether or not other surface cleaning methods will work as reliable and economical as pickling securing the same corrosion resistance. In this paper the relative merits of some usual cleaning operations and their possible applications are shown, namely brushing, grinding, blasting and, for reasons of comparison, pickling. Our results showed that pickling yields the best cleaning effect and secures the best surface conditions for the formation of a good passive layer. Glass ball‐blasting, properly conducted, gives the same cleaning efficiency. Welding and brushing can only be tolerated in special cases.