Passivation Level of AISI 316L Aseptic Tank Surface Quantified by On-Site Electrochemical Techniques

Autor(es)

Luis Henrique Guilherme ^[1] ; Assis Vicente Benedetti ^[2] ; Cecílio Sadao Fugivara ^[3] ; Dirk Engelberg ^[4]

Afiliação do(s) autor(es)

^[1] Soudap Soldas Sanitárias - Brasil

^[2] Universidade Estadual Paulista. Instituto de quimica - Brasil

^[3] Universidade Estadual Paulista. Instituto de quimica - Brasil

^[4] The University of Manchester. Department of Materials. Corrosion & Protection Centre - Reino Unido

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 25, 2022-02-11.

Resumo

Abstract Frequently stainless steel AISI 316L aseptic tanks have their passivity and corrosion resistance properties degraded by biofilm formation and localized corrosion processes. Thereby, maintenance projects are performed to repair the surface in food-grade product contact to obtain an aseptic property as defined by ASME BPE. However, the on-site non-destructive testing are limited to the liquid penetrant examination and the average roughness measurement. The on-site open circuit potential and on-site cyclic polarization measurements were conducted using a portable electrochemical minicell. The level of passivation was quantified on the tank surface, and it was performed before and after the repairing maintenance protocol be made. The results of the on-site electrochemical measurements showed a clear difference between as-degraded and repaired surfaces, indicating a sensible response to aseptic surface inspection. The on-site open circuit potential together with the on-site cyclic polarization were considered an advanced tool to support the maintenance projects of the AISI 316L aseptic surfaces. (AU)

• Processo FAPESP: 19/23063-4 - Qualificação, validação e monitoramento de equipamentos e utilidades industriais de aplicações assépticas ou corrosivas
• Beneficiário: Luis Henrique Guilherme
• Modalidade de apoio: Auxílio à Pesquisa - Pesquisa Inovativa em Pequenas Empresas - PIPE