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Investigations of corrosion behaviour of SnSb12Cu6Pb alloy in 0.1M H2SO4 and 0.5M NaCl solution

Hrabia-Wiśnios J., Leszczyńska-Madej B., Kowalik R.

Journal of Achievements in Materials and Manufacturing Engineering

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2020

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Vol. 101, nr 1

5--14

EN

Purpose: The results presented the microstructure and corrosive behavior of SnSb12Cu6Pb alloy (B82) in H2SO4 aqueous solution and NaCl aqueous solution. Design/methodology/approach: The electrochemical corrosion has been investigated in two different aqueous solutions: 0.1M sulfuric acid (H2SO4) and 0.5M sodium chloride (NaCl) solution measuring of potential changes relative to immersion time and conducting mass loss test. Microscopic investigations before and after corrosion tests were made using scanning electron microscopy. Findings: The obtained results indicate very good corrosion resistance of the alloy tested in NaCl solution. Corrosion progresses faster in a sulfuric acid aqueous solution compared to sodium chloride aqueous solution. Also, it was found that the dominant mechanism of corrosion degradation in both solutions is selective corrosion which is a particularly undesirable type of corrosion because it involves the loss of one alloying component and the formation of porous structure on the alloy surface. Research limitations/implications: The aqueous solutions used in this study are not a natural working environment of the bearing. However, a comparison of acidic and neutral solutions allows explaining the corrosion behavior of tin babbitts due to contaminants of oil lubricants. Further research should be conducted in more aggressive environments characteristic of industrial conditions. Practical implications: One of the important properties of bearing alloys are corrosion resistance. Corrosion properties are extremely important for the transport and storage of metallic components before they are used. Also, the working environment can have a destructive effect on the properties of the materials used. Industry environment, aging stagnant oil, and some acids may lead to selective corrosion of the tin, copper, lead, or antimony components and leaving a rough and weakened the babbitt surface. Electrochemical corrosion can contribute to the acceleration of bearing wear and consequent to bearing damage. Originality/value: Studies of the corrosion of tin-babbitt bearings are not extensive in the literature due to rare tin corrosion. This study could be an important complement to knowledge about the corrosion behavior of tin-based bearing alloys.

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Corrosion Behaviour of Low-Alloyed Cast Steel in Diverse State

Kondracki M., Studnicki A., Szajnar J.

Archives of Foundry Engineering

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2015

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Vol. 15, iss. 1

25--28

EN

In the paper the results and analysis of corrosion tests were presented for low-alloyed cast steel in as-cast state and after heat treatment operations. Such alloys are applied for heavy loaded parts manufacturing, especially for mining industry. The corrosion test were performed in conditions of high salinity, similar to those occurring during the coal mining. The results have shown, that small changes in chemical composition and the heat treatment influence significantly the corrosion behaviour of studied low-alloyed cast steels.

3

Influence of carburising and heat treatment operation on selective corrosion of chromium cast steels

Kondracki M., Studnicki A., Szajnar J.

Ochrona przed Korozją

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2014

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nr 5

174--178

EN

The paper presents studies on corrosion resistance of chromium cast steels with additions of Ni and Mo after chemical and heat treatment operations. The chromium content varied from 6 to 18 weight %. Corrosion tests were performed according to modified methodology of ASTM test and results of presented in position [17]. The range of investigations included the corrosion studies of samples after heat treatment operations (hardening and tempering) and after carburising with consecutive hardening. Analyses have shown the influence of those operations on corrosion resistance of studied alloys. The carburising process caused the structural changes in surface layer of cast steel, increasing the operation properties. Obtained results were compared with observation of low-alloyed steel samples after heat treatment.

PL

Artykuł prezentuje badania korozyjne staliw wysokochromowych z dodatkiem Ni i Mo w stanie po obróbce cieplnej i nawęglaniu. Udział chromu zmieniał się w zakresie 6–18% mas. Badania korozyjne wykonano w oparciu o metodykę zaproponowaną w normie ASTM oraz pracy [17]. Zakres badań obejmował testy korozyjne próbek pobranych z materiału po operacjach obróbki cieplnej (ulepszanie cieplne) oraz w stanie po nawęglaniu i hartowaniu. Przeprowadzone analizy ujawniły wpływ zabiegów obróbki cieplnej na odporność korozyjną badanych stopów. Zabiegi nawęglania spowodowały zmiany strukturalne w warstwie powierzchniowej staliwa, polepszając własności użytkowe. Uzyskane wyniki porównano z wynikami uzyskanymi dla stali niskostopowych w stanie po obróbce cieplnej.