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. 2021 Mar 13;104(1):0036850421998529. doi: 10.1177/0036850421998529

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© The Author(s) 2021

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (https://creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 3. — The surface and cross section of CKS piston ring: (a) surface of piston ring obtained by SEM, (b) cross section of piston ring obtained by SEM, and (c) chemical composition obtained by EDS.