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Abstract
This paper presents the results of testing two different materials in aggresive atmosphere rich in sodium chloride (NaCl) depending on different time intervals (48, 96, 168, 240 hours), in order to determine the corrosion process flow. One of the materials is general structural steel SA516 Gr.70 and the other is austenitic stainless steel X6CrNiTi18-10. The test results were statistically analyzed with the aim of obtaining statistical regression models, as well as to investigate the effect of alloying elements on the corrosion process flow. Models for predicting the corrosion process flow (mass loss) of both materials were obtained by statistical analysis and it was determined that the proportion of alloying elements influences the change in the flow. Accordingly, general structural steel is characterized by linear, while austenitic stainless steel is marked by slow corrosion process flow. This indicates that the proportion of alloying elements which improve the corrosion resistance of the material strongly affects the durability of the material in an aggressive environment.
Highlights
The damaging of structural materials by corrosion mechanisms poses a major problem in exploitation, causing a deviation from the dimensioned properties as well as a reduction of the total life span
This paper presents the results of testing two different materials in aggresive atmosphere rich in sodium chloride (NaCl) depending on different time intervals (48, 96, 168, 240 hours), in order to determine the corrosion process flow
Statistical analysis of the experimental data obtained by testing two types of materials under aggressive sodium chloride (NaCl) conditions of the salt chamber was performed for the purpose of determining their corrosion resistance
Summary
The damaging of structural materials by corrosion mechanisms poses a major problem in exploitation, causing a deviation from the dimensioned properties as well as a reduction of the total life span. The above mentioned exploitation properties mainly depend on the corrosion resistance of the particular material a certain structure is made from. If the structure or element is going to be used in environment such as the coastal atmosphere, it is necessary to know or establish the corrosion resistance of the material when it is exposed to sodium chloride. Selecting the optimum construction material prevents material degradation, i.e. the mass loss caused by the appearance of corrosion mechanisms, which would result in a reduction of the required structure dimensions [11-13]
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