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The Influence of Temperature and Time in Electropolishing on Surface Roughness of Inner Surface of Stainless Steel 316l Cylinder for Pharmaceutical Industry Components

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Abstract:

Surface cleanliness and smoothness are essential criteria for pharmaceutical components and they hold significant importance. Smooth surface minimizes bacterial accumulation and facilitates easier cleaning, promoting hygiene. In the pharmaceutical industry, equipment often employs electropolished tube pipes within machine components as conduits for processed medicinal solutions. Electropolishing is a widely-used electrochemical method involving a metal anode to achieve a smooth surface finish. This research is to investigate the impact of electropolishing temperature and time on the surface roughness of the inner surface of stainless steel 316L cylinders used in the pharmaceutical industry. Studying the influence of temperature and electropolishing time variations on the lowest surface roughness value inside a cylinder material, and identifying appropriate testing according to the ASME BPE surface roughness standard of less than 0.38 μm. Additionally, this study involves measuring the inner surface roughness, morphological characterization using metallurgical microscopy and SEM, as well as conducting potentiodynamic testing to assess the effectiveness of electropolishing. Based on the conducted experiments, it can be concluded that the lowest surface roughness value is found in samples subjected to a temperature variation of 60°C with a 7-minute EP duration, yielding an average surface roughness of 0.177 μm. Operational conditions that meet ASME BPE criteria (< Ra 3.8 μm) are achieved at electrolyte temperatures of 50°C and 60°C, with electropolishing process durations of 3-7 minutes. The lowest corrosion rate obtained was 0.00274 mpy with a surface roughness reduction of 70.50%, demonstrating the effectiveness of the electropolishing process.

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Periodical:

Solid State Phenomena (Volume 377)

Pages:

35-44

DOI:

https://doi.org/10.4028/p-ki8Xf9

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Online since:

October 2025

Authors:

Vera Novi Anggraini*, Soleh Wahyudi, Sri Mulyati Latifah, Bambang Widyanto

Keywords:

ASME BPE, Electropolishing, Stainless Steel 316l, Surface Roughness

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