An Electrochemical Study of the Corrosion Behaviour of the Polished Atomic Diffusion Additive Manufactured 17-4PH Stainless Steel Using Centrifugal Mass Finishing Method in Saltwater

Ahuir-Torres, JI ORCID: 0000-0002-3160-0223, Liu, X ORCID: 0000-0002-6987-2451, Chadwick, J ORCID: 0009-0000-1583-3361 and Opoz, TT ORCID: 0000-0001-6579-2238 (2025) An Electrochemical Study of the Corrosion Behaviour of the Polished Atomic Diffusion Additive Manufactured 17-4PH Stainless Steel Using Centrifugal Mass Finishing Method in Saltwater. Materials, 18 (22). pp. 1-21. ISSN 1996-1944

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Abstract

Additive manufacturing (AM) enables the fabrication of complex geometries and high-performance alloys such as 17-4PH stainless steel. However, the surface defects inherent to AM components compromise corrosion resistance. The post surface treatment can reduce and eliminate these defects. This study examines the effect of centrifugal mass finishing on the corrosion behaviour of 17-4PH stainless steel produced by AM. Corrosion behaviour of the samples in a 0.6 M NaCl solution is assessed using electrochemical technique testing, including asymmetry electrochemical nose, potentiodynamic polarisation curves, electrochemical impedance spectroscopy, and Mott-Schottky. All electrochemical testing were conducted in concordance with the specifications of ASTM standards. The electrochemical impedance spectroscopy were performed over period ranging from 2 h to 96 h with intervals of approximately one day. Finished specimens exhibit significantly improved corrosion resistance compared with as-built counterparts. Notably, the polished surfaces demonstrate spontaneous oxidised layer recovery between −0.297 V and 0 V, indicative of the enhancement of the protection during early immersion stages. This behaviour is attributed to surface modifications induced by the finishing process, including reduced roughness in 78% and imperfections. These findings highlight the importance of optimising post-processing protocols to improve the durability of AM stainless steels in aggressive environments.

Item Type:	Article
Uncontrolled Keywords:	17-4PH stainless steel; atomic diffusion additive manufacturing; centrifugal mass polishing; corrosion behaviour; surface roughness; 4014 Manufacturing Engineering; 40 Engineering; 03 Chemical Sciences; 09 Engineering; 34 Chemical sciences; 40 Engineering
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Divisions:	Engineering
Publisher:	MDPI AG
Date of acceptance:	7 November 2025
Date of first compliant Open Access:	22 December 2025
Date Deposited:	22 Dec 2025 16:24
Last Modified:	22 Dec 2025 16:24
DOI or ID number:	10.3390/ma18225148
URI:	https://researchonline.ljmu.ac.uk/id/eprint/27765

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