Assessing of New Coatings for Iron Artifacts Conservation by Recurrence Plots Analysis

Abstract

Cast iron has stood for centuries of invention. It is a very versatile and durable material. Coating systems are a low-maintenance protection method. The purpose of this research is to increase the Paraloid coating’s resistance when applied to iron in high humidity atmospheres, with the addition of caffeine (1,3,7-dimethylxanthine) and nicotine (S)-3-(1-methylpyrrolidin-2-yl) pyridine as corrosion inhibitors; the resistance of protection versus exposure time will be evaluated by using electrochemical noise. A statistical analysis of the electrochemical noise signals was carried out. Recurrence plots were used as a powerful tool in the analysis to complement the data obtained and they predicted the evaluation of coatings behaviors performance versus time. The outcomes show that the addition of inhibitors increases and improves the performance as a temporary protection of Paraloid and that protection in high relative humidity was improved. Recurrence plots and parameter quantification show the variances in the surface corrosion dynamics.

Plants’ Phytochemicals – A Critical Discussion on Their Potential to Protect Cultural Heritage Objects

“…This can be the case of coatings based silver nanoparticles obtained by phytosinthesis with Schinus molle, Equisetum giganteum, and Ilex paraguariensis Saint Hilaire which have the property to inhibit fungal and bacterial growth (Barberia-Roque et al, 2019). Caffeine and nicotine increased the properties of comercial product Paraloid B-72 in the case of iron artefacts conservation, in 98% relative humidity, nicotine presenting a high degree of protection, superior to the caffeine protection (Roncagliolo Barrera et al, 2019). The extract of Punica granatum can decrease the damage caused by corrosion in 2 M HCl and 1 M H2SO4 solutions.…”

Recent Advances in Protective Coatings for Cultural Heritage–An Overview

“…Another interesting piece of research displayed the possibility of protecting iron using Paraloid B72 with caffeine (1,3,7-dimethylxanthine) or nicotine pyridine (S)-3-(1-methylpyrrolidin-2-yl) as corrosion inhibitors [64]. The experimental results were crossed with statistical analysis.…”

A Brief Introduction to Nonlinear Time Series Analysis and Recurrence Plots

“…Hou et al [72] used four RQA measures to construct a PCA-based model for detecting corrosion and also as a feature vector for a multilayer perceptron to predict corrosion type. More recently, Barrera, Gómez and Garciá-Ochoa [73] used RQA to assess and compare the performance of protective coatings on cast iron that inhibit corrosion.…”