HOCHLEITNER - INSIGHTS #CorrosionHOCHLEITNER - INSIGHTS #Corrosionhttps://www.hochleitner-marine.com/blogs/tag/corrosionWed, 10 Aug 2022 18:13:31 -0700http://zoho.com/sites/<![CDATA[Influence of Paint on Steel Corrosion for Marine Applications]]>https://www.hochleitner-marine.com/blogs/post/Influence-of-Paint-on-Steel-Corrosion-for-Marine-ApplicationsDepartment of Production Engineering and Printing Technology, Akhbar El-Yom Academy Abdou Abdel-Samad 1* , Yaser Soud , M. Zaki The majority of naval ship ]]>

Department of Production Engineering and Printing Technology, Akhbar El-Yom Academy Abdou Abdel-Samad1*, Yaser Soud, M. Zaki

The majority of naval ships are constructed of mild steel. Corrosion is a major concern in a maritime environment. This particular type of material degradation has recently received more attention by the marine industry. The present work aims to investigate the effect of recent coatings used in marine ship surfaces for preventing corrosion. Experiments were performed according to standard tests to evaluate and measure the coating adhesion to steel and to measure the corrosion wear rate if any for three types of coatings.

An accelerated corrosion test was conducted to duplicate in the laboratory the field corrosion performance of a product. The results indicate that all tested types of paint have resulted in a reduction in the corrosion rate compared with the uncoated steel.

A minimum corrosion rate of 0.8 mm/year for the coat “Hempadur 52,140” was obtained compared to 2.1 mm/year for the uncoated steel. A microscopic examination of the corroded steel surfaces was conducted which prevailed pitting behavior with different degree.

The minimum corroded surface exhibited few pitting attack in comparison to other specimens. Although the pitting attack of the surface layer (paint), one can drive a conclusion that sample surface without coating is aggressively attacked by pits.
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]]>Tue, 03 May 2022 22:50:00 +0000<![CDATA[Marine paint fomulations: Conducting polymers as anticorrosive additives]]>https://www.hochleitner-marine.com/blogs/post/Marine-paint-fomulations-Conducting-polymers-as-anticorrosive-additivesElaine Armelin , Ramón Oliver , Francisco Liesa , José I. Iribarren , Francesc Estrany , Carlos Alemán Abstract Within coating technology, there is increasin ]]>


Abstract

Within coating technology, there is increasing interest in the development of efficient anticorrosive additives able to replace the conventional inorganic anticorrosive pigments usually added to paints, which may have detrimental effects on both environment and health. A number of recent studies have evidenced that the modification of a paint formulation by the addition of a low concentration of conducting polymer (0.2–0.3%, w/w) increases significantly the protective properties of the coating. Here we focus on the principles of anticorrosive additives based on conducting polymers for marine paints. The article reviews the most important findings achieved in recent studies. The relevant factors that are determinant for the anticorrosive protection imparted by conducting polymers, as the doping level, the miscibility with paint, the electrochemical stability, etc., are discussed in detail.

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