VLIV POVLAKU ČISTÉHO HLINÍKU NA KOROZNÍ ODOLNOST SLITINY ALCU4MG1

THE EFFECT OF PURE ALUMINIUM COATING ON CORROSION RESISTANCE OF ALCU4MG1 ALLOY

článek v časopise - ostatní, Jost

en

The paper deals with the corrosion research of wrought aluminium alloy (AlCu4Mg1) and comparing results with the same material coated by 99.5% aluminium. As the corrosive medium the neutral salt spray of 5% NaCl aqueous solution was used. The course of the corrosion resistance test was in accordance with the standard EN ISO 9227. The experiments were carried out with increasing exposition time of 48, 96, 240, 480, 720 and 1000 hours. The weight losses were measured and calculated in g/m2 and mm/year. Corrosion type was assessed by comparison with etalons after the standard CSN 03 8137, the most frequent corrosion damage was indentified corrosion pitting for both materials. The depth of corrosion attack was observed on cross-section cuts by light optical microscope and detected by image PC software Olympus Analysis 5.

Príspevek je zameren na zkoumání korozního chování hliníkové slitiny v prostredí neutrální solné mlhy dle platné normy EN ISO 9227. Zkouseny byly dva typy materiálu, tj. tvárená slitina AlCu4Mg1 v základním stavu a s ochrannou vrstvou z cistého hliníku. Korozní testy byly provedeny se zvysující se dobou expozice (48, 96, 240, 480, 720 a 1000 hodin). Namerené hmotnostní ubytky byly prepocítány na g/m2 a korozní rychlost v mm/rok. Porovnáním s etalonem dle normy CSN 03 8137 byla pro oba materiály jako nejcasteji se vyskytující typ vyhodnocena dulková koroze. Hloubka korozního napadení byla zkoumána na prícných metalografických rezech na svetelném mikroskopu a vyhodnocena na základe výsledku obrazové analýzy s vyuzitím PC softwaru Olympus Analysis 5.

The paper deals with the corrosion research of wrought aluminium alloy (AlCu4Mg1) and comparing results with the same material coated by 99.5% aluminium. As the corrosive medium the neutral salt spray of 5% NaCl aqueous solution was used. The course of the corrosion resistance test was in accordance with the standard EN ISO 9227. The experiments were carried out with increasing exposition time of 48, 96, 240, 480, 720 and 1000 hours. The weight losses were measured and calculated in g/m2 and mm/year. Corrosion type was assessed by comparison with etalons after the standard CSN 03 8137, the most frequent corrosion damage was indentified corrosion pitting for both materials. The depth of corrosion attack was observed on cross-section cuts by light optical microscope and detected by image PC software Olympus Analysis 5.

Hliník, povlak, koroze

Aluminum, coating, corrosion

2010

15.12.2010

1210-0471

Transaction of the VŠB-Technical university of Ostrava, Mechanical series

LVI

2

143–148

6