Results from sea-water and laboratory exposure tests with multiple crevice assemblies are presented. The results from tests on austenitic and ferritic-austenitic stainless steel samples subjected to various surface treatments demonstrate that an acid treatment greatly improves the crevice corrosion resistance of previously ground surfaces. Pickling in dilute sulphuric acid and passivation in nitric acid has thereby virtually the same beneficial effect as the common nitric + hydrofluoric pickling acid. The beneficial effect of pickling and passivation is related to the removal from the surface of sulphide inclusions, being potential nucleation sites for the initiation of discrete pitting attacks preceding the onset of crevice corrosion. Potentiodynamically determined pitting potentials and results from testing in I O Y FeCI, . h H 2 0 according to ASTM G 48-76 show poor correlation with results from sea-water exposures.Vorgelegt werden Ergebnisse von Lagerversuchen in naturlichem Mccrwnsser und im Lahoratorium; dabei wurden Probenanordnungen rnit Mehrl'achspalten benutzt. Die Ergebnissc mit austenitischen und fcrritisch-austenitischen Stahlen verschiedener Oberflachenzustande zeigen. daR eine Behandlung mit SBure die Spaltkorrosionsbestandigkeit von geschliffenen Oberflachen betrachtlich verbessert. Beizen in verdiinnter Schwefelsaure und Passivieren in Salpetersaure haben dabei praktisch den gleichen giinstigen Effekt wie das iibliche Beizen i n Salpetersgure + FluBsHure. Die giinstige Wirkung des passivierenden Beizens beruht auf der Entfernung der an der Oberflaehe befindlichen Sulfideinschliisse. die Keimstellen liir Lochkorrosion bilden, die der Spaltkorrosion vorangeht. Die potentiodynamisch ermittelten I.ocIikorrosioiis~~~~t~~iti;llc sowic die Ergehnisse von Vcrsuchen in 10% FeC1, . 6 H1O (ASTM G 48-76) zeigen schlechte Ubereinstimni ti rig mi t dcn in Mecr\vaaac I c rhal t c ncii Ergc bn i ~s e n .
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