A Study on the Degradation of Coating and Corrosion of Ship’s Hull Based on the Probabilistic Approach

Abstract

In this paper, phenomena of general corrosion are assumed to be the results of three sequential processes: degradation of paint coatings, generation of pitting point, and progress of pitting point. A consistent corrosion model is proposed which can evaluate the generation and progress of corrosion quantitatively by introducing appropriate simple probabilistic models for each process. This probabilistic corrosion model can be identified by analyzing existing data collected from plate thickness measurements. Applicability of this model is verified by comparing the estimated behavior of corrosion progress and dispersion with those from actual data.

An Approach to the Probabilistic Corrosion Rate Estimation Model for Inner Bottom Plates of Bulk Carriers

“…In previous research, authors were motivated to investigate corrosion degradation of some specific structural members such as transversal bulkhead of bulk carriers [7] or deck plating of tankers [8,9,10,11], or all structural members (see Paik et al [4,12,13]). …”

“…In particular, based on the probabilistic model proposed by Yamamoto et al [24], [25] and Paik et al [4], it was usually assumed that the probability density function of the corrosion rate follows the Weibull distribution. Hence, the cumulative distribution function and the probability density function of the coefficient 1 c from Eq.…”

“…The main reason for this lies in the fact that such kind of a problem is not covered by the previous research works in the field. Previous research covered mostly cargo holds and ballast tanks [6,7,15,16].…”

Aging Effects on Ship Structural Integrity

“…A typical model of the corrosion degradation process consists of at least two phases: a phase without corrosion because of the durability or the life of the protective coating and phase of the corrosion progression. Three models for the corrosion degradation in ship structures are those originally developed by Melchers [9], Yamamoto & Ikagaki [10] and Guedes Soares & Garbatov [11] (GS&G) are widely used. Yamamoto & Ikagaki corrosion model has been used by Guo et al [3] (G&A) for analysing a large amount of real corrosion thickness measurements.…”

Effect of analysis parameters on non-linear implicit finite element analysis of marine corroded steel plate

“…The cross sectional view of the corrosion pits is reproduced from their work in Figure 1. The probabilistic corrosion model that is proposed by Yamamoto and Ikegami based on a number of studies [4] quantitatively evaluate generation and progress of corrosion. This model assumes that the phenomena of generation and progress of corrosion are the result of the following three sequential processes (Figure 2):…”