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All Journal KAPAL Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Scientific Journal of Engineering Research
Nitonye, Samson
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Earth & Planetary Sciences Engineering

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The Application of Nanocoating and Cold-Dip Galvanization on Mitigating Corrosion for Ship and Offshore Mooring Chains Orji, Charles U; Nitonye, Samson; Asuquo, Felix U
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 22, No 1 (2025): February
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v22i1.65061

Abstract

Corrosion is a major challenge for marine vessels and offshore mooring systems due to the aggressive maritime environment characterized by high salinity, biological activity, and temperature variations. This study explores the effectiveness of nano-coatings derived from waste snail shells compared to traditional cold-dip galvanization in mitigating corrosion on ANSI A36 steel mooring chains. Three specimen groups—nano-epoxy composite coating, cold-dip galvanized, and bare metal—were tested in fresh and saltwater environments over a five-week period. Water composition, pH, and salinity were analyzed using Atomic Absorption Spectroscopy (AAS) to assess their influence on corrosion behavior. Weekly measurements of corrosion rates were taken to evaluate the protective performance of each treatment. The results demonstrated a significant reduction in corrosion rates for both nano-coated and galvanized samples compared to bare metal. Specifically, the nano-epoxy coating reduced corrosion from 0.13 mm/week to below 0.02 mm/week, while cold-dip galvanized samples showed a similar decline, converging around 0.02 mm/week. Bare metal, however, stabilized at approximately 0.05 mm/week. These findings suggest that nano-coatings are a promising, sustainable alternative to conventional galvanization, enhancing the durability and operational lifespan of mooring systems and offshore structures. This advancement supports the offshore industry’s need to meet stringent classification guidelines and extend the design life of critical components. Further long-term exposure studies are recommended to confirm the sustained effectiveness of nano-epoxy coatings in marine environments.
Probabilistic Finite Element Analysis of Temperature-Dependent Corrosion in Oil and Gas Pipelines Nrior, Million Matthew; Nitonye, Samson; Adumene, Sidum; Orji, Charles Ugochukwu
Scientific Journal of Engineering Research Vol. 2 No. 2 (2026): June
Publisher : PT. Teknologi Futuristik Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.64539/sjer.v2i2.2026.427

Abstract

Marine pipeline systems are continually exposed to operating conditions that accelerate internal corrosion, posing risks to flow assurance and structural integrity. This study applies finite element modelling to evaluate the influence of operating temperature on corrosion progression and pipeline performance. The study addressed gaps in temperature-based corrosion propagation in a pipeline using ANSYS Design Modeler, meshing, and exporting for flow-corrosion modelling in ANSYS Fluent. A one-way coupling was established between Fluent and ANSYS Mechanical to assess the mechanical response under operating conditions. The base case at 62 °C showed a corrosion rate of 6.0 mm/year. To investigate the role of temperature, simulations were conducted at 30 °C, 50 °C, 62 °C, and 70 °C, representing the typical temperature range of Niger Delta fluid systems.  Results indicate that lower temperatures significantly increase corrosion rates, leading to pronounced wall thinning and elevated stress concentrations. Conversely, higher temperatures reduce corrosion intensity by promoting the formation of protective corrosion films. However, localized stress elevations at higher temperatures were also observed, which may be attributed to combined thermal expansion effects and residual corrosion-induced weakening. This demonstrates a non-linear interaction between temperature, corrosion progression, and stress response. The study recommends maintaining sufficiently high fluid temperatures to mitigate corrosion. Further studies are needed to define the temperature range where corrosion behaves linearly, to support optimal design and operation while preventing conditions that could impair system performance and flow assurance. The result provides technical insight for the development of an integrity management strategy for optimum pipeline safety.
Co-Authors Adumene, Sidum Asuquo, Felix U Nrior, Million Matthew Orji, Charles U Orji, Charles Ugochukwu