The importance of underpaint corrosion caused by damage to paint on steel structures
The impact of varying the dry paint film thickness (DFT) on the underpaint corrosion of steel plates obtained from the floor of an offshore oil platform is evaluated. The specimens were all prepared using the same material and paint scheme, and the DFT and exposure conditions in a salt spray chamber were varied and compared with the results obtained in a real situation. The results indicated that corrosion initiated at sites where the paint was damaged, may be more important than corrosion through the undamaged paint due to permeation, even in cases where the DFT is thin. In specimens whose substrates were previously damaged, there were pathological manifestations of osmotic blistering. The underpaint corrosion that occurred after the paint was damaged in the field occurred at an intensity like that observed for the tested specimens.
Associação Brasileira de Normas Técnicas. (1983). NBR 8094: Material metálico revestido e não revestido – Corrosão por exposição à névoa salina. Rio de Janeiro.
Associação Brasileira de Normas Técnicas. (1997). NBR 9583. Implantes para cirurgia - Ensaio não-destrutivo - Inspeção por líquido penetrante de implantes cirúrgico metálicos. Rio de Janeiro.
Associação Brasileira de Normas Técnicas. (2005). NBR 15239: Tratamento de superfícies de aço com ferramentas manuais e mecânicas. Rio de Janeiro.
Associação Brasileira de Normas Técnicas. (2008). NBR 10443: Tintas e vernizes – Determinação da espessura da película seca sobre superfícies rugosas – Método de ensaio. Rio de Janeiro.
ASTM International. (2001). B117-16: Standard Practice for Operating Salt Spray (Fog) Apparatus. West Conshohocken, PA.
Chawla S. L, Gupta K. K. (1995), “Materials selection for corrosion control”, Materials Park, OH, ASM International.
Gentil, V. (2007), “Corrosão”, 5. ed., LTC Livros Técnicos e Científicos Editora S.A., Rio de Janeiro.
ISO (1998). ISO 8502-9: Preparation of steel substrates before application of paints and related products – Tests for the assessment of surface cleanliness – Part 9: Field method for the conductometric determination of water-soluble salts. Geneva, Switzerland.
ISO (2006). ISO 8502-6: Preparation of steel substrates before application of paints and related products – Tests for the assessment of surface cleanliness – Part 6: Extraction of soluble contaminants for analysis – The Bresle method. Geneva, Switzerland. DOI: https://dx.doi.org/10.31030/9727591
ISO (2007). ISO 8501-1: Preparation of steel substrates before application of paints and related products – Visual assessment of surface cleanliness – Part 1: Rust grades and preparation grades of uncoated steel substrates and of steel substrates after overall removal of previous coatings. Geneva, Switzerland. DOI: https://dx.doi.org/10.31030/9871577
ISO (2012). ISO 9227: Corrosion tests in artificial atmospheres – Salt spray tests. 3rd ed. Geneva, Switzerland.
Jones, D. A. (1996), “Principles and prevention of corrosion”, 2nd ed., Prentice-Hall Inc, New York, University of Nevada, Nevada.
Nunes, L. D. P., Lobo, A. C. O. (2007), “Pintura industrial na proteção anticorrosiva”, 3. ed., COPPE/UFRJ, Rio de Janeiro.
Ramanathan, L. V. (1988), “Corrosão e seu controle”, Editora Hemus, Rio de Janeiro.
Ribeiro Filho, G. L. (2018), “Estudo de patologias de pintura e corrosão atmosférica em plataforma de petróleo”, Dissertação de Mestrado, Universidade Federal de Ouro Preto.
Silva, P. F. D. (1981), “Introdução à corrosão e proteção de superfícies metálicas”, Imprensa Universitária da UFMG, Belo Horizonte.
Sosa, M. R., Pérez, T., Moo-Yam, V. M. J., Chávez, E. and Pérez-Quiroz, J. T. (2018), “Análise da interface concreto-aço em corpos de prova expostos à intempérie e imersos em água do mar natural”, Revista ALCONPAT, 8 (1), pp. 16 – 29, DOI: http://dx.doi.org/10.21041/ra.v8i1.203
Wolynec S. (2003), “Técnicas Eletroquímicas em Corrosão”, Editora da Universidade de São Paulo, São Paulo.
Copyright (c) 2020 G. L. Ribeiro Filho, R. A. J. Ribas, G. D. Paula
This work is licensed under a Creative Commons Attribution 4.0 International License.
License in effect from September 2020
Attribution 4.0 International (CC BY 4.0)
This is a human-readable summary of (and not a substitute for) the license. Disclaimer.
Articles published in Revista Alconpat will be Open-Access articles distributed under the terms and conditions of the Creative Commons Attribution License (CC BY). The copyright is retained by the author(s). Revista Alconpat will insert the following note at the end of the published text:
“Copyright 2021 by the authors. This work is an Open-Access article published under the terms and conditions of an International Creative Commons Attribution 4.0 International License (CC BY 4.0)”.
You are free to:
The licensor cannot revoke these freedoms as long as you follow the license terms.
Under the following terms:
- Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
- No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.
- You do not have to comply with the license for elements of the material in the public domain or where your use is permitted by an applicable exception or limitation.
- No warranties are given. The license may not give you all of the permissions necessary for your intended use. For example, other rights such as publicity, privacy, or moral rights may limit how you use the material.