The article presents the mechanical properties and the course of corrosion processes of selected engineering materials used for structural elements of special naval vessels (high-speed craft and minesweepers).In this type of vessel, austenitic steels and aluminum alloys are widely used. The corrosion of these materials, caused by the simultaneous interaction of water and operational stresses, is one of the main causes of the reduction in the strength properties of ship structures. The nature and course of corrosion damage depend mainly on the chemical composition of the material under investigation [1,2]. The corrosion resistance of the aforementioned materials was determined by combining standard test methods with an analysis of the electrochemical parameters of the oxide (passive) layer, which naturally forms on the materials tested. Steel 304 exhibits significantly better corrosion resistance than the 5086 alloy under a load of σ=0.8Re(0.2). The corrosive degradation of the operational properties of the 5086 alloy is caused by exfoliation corrosion, whereas in steel 304, it is caused by pitting corrosion followed by intergranular corrosion.
MECHANICAL PROPERTIES AND CORROSION RESISTANCE OF AMAGNETIC MATERIALS FOR SPECIAL SHIP CONSTRUCTIONS
The paper presents mechanical properties and corrosion resistance of selected engineering materials for structural elements of special ships (fast boat and minesweeper). These kind of ships are made of austenitic steels and aluminum alloys. Corrosion of these materials due to simultaneous impact of sea water and exploitation stress is one of the reasons of deterioration of their mechanical properties. The character and the progress of the corrosion degradation depends mainly on chemical composition of the investigated material [1,2]. Corrosion resistance of the aforementioned materials was determined by combination of standrad investigation method and analysis of electrochemical parameters of oxide layer (passive layer), which forms naturally on the these materials. 304 steel exhibits much better corrosion resistance than alloy AlMg at the load (σ=0,8Re(0,2)).
AlMg alloys undergoes exfoliations type of corrosion damage whereas 304 steel suffers from pitting attack, which later transforms into intergranular corrosion. (…)
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Source: Logistyka Magazine