Banca de QUALIFICAÇÃO: YSLLA EMANUELLY DA SILVA FACCIOLI

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : YSLLA EMANUELLY DA SILVA FACCIOLI
DATE: 17/03/2025
TIME: 14:00
LOCAL: Instituto Avançado de Tecnologia e Inovação - IATI
TITLE:

APPLICATION OF MICROBIAL BIOSURFACTANT IN THE FORMULATION OF AN INHIBITIVE ECOLOGICAL PRIMER METAL CORROSION.

KEY WORDS:

Biosurfactant; Pseudomonas cepacia; Metal Corrosion; Biofilm;
Seawater..

PAGES: 137
BIG AREA: Outra
AREA: Multidisciplinar
SUBÁREA: Biotecnologia
SUMMARY:

Corrosion is a critical challenge in industries operating in marine environments, affecting the structural integrity of metals and increasing operational costs. Conventional control methods, such as chemical inhibitors, often present environmental and economic disadvantages due to their toxicity and low biodegradability. In this study, the potential of a biosurfactant produced by Pseudomonas cepacia CCT 6659 as a corrosion inhibitor for metal surfaces was evaluated, both as a direct protective agent and as a key component in the formulation of an environmentally friendly anticorrosive primer. The biosurfactant was successfully produced from low-cost substrates, and its stability was improved through optimized preservation methods. Exposure tests in sterile and fresh seawater demonstrated its ability to inhibit corrosion by forming a protective barrier against aggressive agents. Under static conditions, the formulated biosurfactant (1:5) significantly reduced mass loss in carbon steel samples (119.718 g/m²) compared to the control (280.281 g/m²). Under dynamic conditions, the biosurfactant formulation (1:2) was the most effective, reducing corrosion to 578.873 g/m² compared to 901.408 g/m² in the control. Microbiological analysis revealed that the biosurfactant negatively impacted the growth of sulfate-reducing bacteria, the main agents responsible for MIC. Scanning electron microscopy (SEM) confirmed modifications in microbial adhesion and biofilm formation, reducing the effects of localized corrosion. Furthermore, the formulated primer demonstrated strong adhesion, long-term durability, and low environmental toxicity, making it a viable alternative to conventional coatings. Field applications in estuarine and open-ocean environments have validated their effectiveness, showing comparable or superior performance to commercial anti-corrosive products. These findings highlight the potential of microbial biosurfactants as sustainable solutions for corrosion inhibition, promoting the development of environmentally friendly protective coatings, while reducing the ecological impact and ensuring the longevity of metal structures in marine and industrial environments.

 

COMMITTEE MEMBERS:
Externo à Instituição - CLÁUDIO JOSÉ GALDINO DA SILVA JUNIOR - UFRPE
Externo à Instituição - ITALO JOSÉ BATISTA DURVAL - UFRPE
Interno - ***.743.104-** - VALDEMIR ALEXANDRE DOS SANTOS - UNICAP