Abstract
The work deals with influence of surface structure on corrosion behaviour of austenitic stainless steel AISI 316L welded by TIG method without filler. Surfaces of the welded stainless steel were modified by mechanical treatment methods (grinding, garnet blasting, chemical method (pickling) and combination of both methods. Experimental procedures included the use of immersion and electrochemical tests where iron chloride (FeCl3) and sodium chloride (NaCl) solutions were used as test electrolytes. The surfaces of the specimens were examined using light microscopy and scanning electron microscopy (SEM). Experimental results confirmed the significant influence of mechanical as well as chemical surface treatment on corrosion behaviour of the welded stainless steel AISI 316L in various chloride solutions.
Highlights
IntroductionAustenitic stainless steel, in addition to its excellent corrosion resistance, mechanical properties (high ductility and high toughness) and weldability, is mainly used in environment that requires high reliability and durability of the material
Austenitic stainless steel, in addition to its excellent corrosion resistance, mechanical properties and weldability, is mainly used in environment that requires high reliability and durability of the material
The impact of surface treatments of welded AISI 316L steels on corrosion resistance is presented in this paper
Summary
Austenitic stainless steel, in addition to its excellent corrosion resistance, mechanical properties (high ductility and high toughness) and weldability, is mainly used in environment that requires high reliability and durability of the material. The impact of surface treatments (mechanical, mechanicalchemical) of welded AISI 316L steels on corrosion resistance is presented in this paper. Corrosion behaviour of this steel under various chloride solutions was evaluated by immersion and electrochemical test. Three specimens from each group (grinding, garnet blasting) were pickled for 30 minutes at temperature of 22 ± 2 °C in solution with composition 100 ml of 50% HNO3, 5 ml of 38% HF, 395 ml of distilled H2O. The effects of different treated surfaces were investigated by scanning electron microscope (SEM) and the EDX chemical analysis
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