scholarly journals Protection Coatings for the Underwater Part of Ship’s Hull

2018 ◽  
Vol 55 (1) ◽  
pp. 59-70
Author(s):  
Renato Ivce ◽  
Matej Grubiša ◽  
Darijo Mišković
Keyword(s):  
Marine Environment ◽  
Protective Coatings ◽  
Construction Materials ◽  
General Consideration ◽  
Antifouling Paints ◽  
Environment Friendly ◽  
Marine Industry ◽  
Useful Life ◽  
Alternative Solutions ◽  
Day By Day

In this article authors present a general consideration of the underwater part of ship’s hull protection by protective coatings, paying particular attention to antifouling paints. Following the presentation of the importance of ship’s hull maintenance and protection in order to make navigation safer and to keep the ship in operation for as long as possible, a summary is made of the main types of antifouling products used throughout the history up to the present time. As far back as a thousand years BC, people had developed techniques to protect objects from falling into disrepair and understood the importance of preserving construction materials in order to prolong their useful life and value. Marine industry has been developing day by day and attention is increasingly focused on the safety of ships and crews, as well as on the protection of marine environment. Tin-free self-polishing copolymer (SPC) and foul release technologies are currently applied, in addition to many alternative solutions being suggested. Modern approaches to effective environment-friendly antifouling systems and their performance are highlighted.

scholarly journals Use of concrete formulations based on dredging sand in the fabrication of tetrapods for protection of harbour dykes

2021 ◽  
Vol 348 ◽  
pp. 01005
Author(s):  
Mehdi Hassoune ◽  
Hassan Fatmaoui ◽  
Jamal Chaoufi
Keyword(s):  
Marine Environment ◽  
Construction Materials ◽  
Dredged Materials ◽  
Port Structures ◽  
Alternative Solutions

Port structures (quays and dykes) need an enormous consumption of materials, in particular concrete and its components, as well as sand, hence the need to develop alternative solutions using port dredging sand, estimated at thousands of tonnes through its use in the concrete that forms the blocks of the quay walls. After having demonstrated in a previous work the possibility of using the dredged sand from the port of Agadir in concrete formulations, the present work consists in showing the possibility of using the dredged sand from the port of Agadir in concrete formulations that can be used in the construction of concrete tetrapods from a concrete formulation based on dredged sand, more precisely 50% of the sand entering in the formulation is dredged sand extracted from the port of Agadir. The eventual use of dredged sand in the concrete of the tetrapods will lead to enormous gains in the quantities of sand and thus to a lower consumption of construction materials, and will also play a more important role in the preservation of the marine environment by avoiding the trapping of the dredged materials.

scholarly journals Mechanical Properties of Protective Coatings against Marine Fouling: A Review

Polymers ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 173
Author(s):  
Alessandro Pistone ◽  
Cristina Scolaro ◽  
Annamaria Visco
Keyword(s):  
Mechanical Properties ◽  
Large Scale ◽  
Protective Coatings ◽  
Scale Up ◽  
Product Distribution ◽  
Properties Of Coatings ◽  
Fouling Organism ◽  
Ship Hulls ◽  
Marine Industry ◽  
Application Fields

The accumulation of marine organisms on ship hulls, such as microorganisms, barnacles, and seaweeds, represents a global problem for maritime industries, with both economic and environmental costs. The use of biocide-containing paints poses a serious threat to marine ecosystems, affecting both target and non-target organisms driving science and technology towards non-biocidal solutions based on physico-chemical and materials properties of coatings. The review reports recent development of hydrophobic protective coatings in terms of mechanical properties, correlated with the wet ability features. The attention is focused mainly on coatings based on siloxane and epoxy resin due to the wide application fields of such systems in the marine industry. Polyurethane and other systems have been considered as well. These coatings for anti-fouling applications needs to be both long-term mechanically stable, perfectly adherent with the metallic/composite substrate, and capable to detach/destroy the fouling organism. Prospects should focus on developing even “greener” antifouling coatings solutions. These coatings should also be readily addressable to industrial scale-up for large-scale product distribution, possibly at a reasonable cost.

The Synthesis and Bioactivities of 2-Hydroxyethyl Benzo[d] Isothiazole-3(2H)-One Marine Antifouling Paints

2013 ◽  
Vol 646 ◽  
pp. 24-29 ◽  
Author(s):  
Jian Xin Yang ◽  
Cheng Hang You ◽  
Xiang Hui Wang ◽  
Qiang Lin
Keyword(s):  
1H Nmr ◽  
Marine Environment ◽  
Aromatic Acid ◽  
Gram Positive ◽  
Fouling Organism ◽  
Antifouling Paints ◽  
Marine Fouling ◽  
Fouling Organisms ◽  
Marine Antifouling

Twenty-one novel compounds were synthesized from the benzo[d]isothiazole-3(2H)-one and aromatic acid, the structures were identified by means of 1H NMR, IR, EA. The intro antibacterial experiment was carried out to evaluate the activities against antibacterial and the marine hanging plate experiment was also carried out to evaluate the activities against marine fouling organism. The results showed that all the compounds were active against the six bacterials, with an inhibiting rate of 90% at the concentration of 32 µg/ml against Gram-positive bacterials, and the antifouling paints couldn’t be attached by marine fouling organisms in the marine environment for more than 3 months.

Comparative Study of Mechanical and Tribological Behaviour of Thermoplast-Based Composites

2017 ◽  
pp. 78-98
Author(s):  
Kaushik Kumar ◽  
J. Paulo Davim
Keyword(s):  
Composite Material ◽  
Comparative Study ◽  
Polymer Matrix ◽  
Weight Ratio ◽  
Experimental Results ◽  
Tribological Behaviour ◽  
Environment Friendly ◽  
Short Cycle ◽  
Inorganic Fillers ◽  
Day By Day

The usage of composite material has been increasing day by day over the years due to the excellent properties being offered by them such as lower volume-to-weight ratio, improved toughness, recyclable, environment friendly and also due to their short cycle productivity, easiness in fabrication, long lasting life span etc. This work presents study of mechanical and tribological behaviour of ABS polymer matrix filled with micron-sized inorganic and Natural / Green fillers. The main purpose behind this work is to compare the performance of composites with different class of fillers. The experimental results unveil that the composite with inorganic fillers perform better than with natural based fillers.

scholarly journals Characterisation Method of the Passivation Mechanisms during the pre-discharge Stage of Plasma Electrolytic Oxidation Indicating the Mode of Action of Fluorides in PEO of Magnesium

Coatings ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 965
Author(s):  
Frank Simchen ◽  
Maximilian Sieber ◽  
Thomas Mehner ◽  
Thomas Lampke
Keyword(s):  
Plasma Electrolytic Oxidation ◽  
Protective Coatings ◽  
Substrate Surface ◽  
Construction Materials ◽  
Systematic Investigation ◽  
Positive Influence ◽  
Passive Layer ◽  
Electrolytic Oxidation ◽  
Anodic Polarisation ◽  
Plasma Electrolytic

Plasma electrolytic oxidation (PEO) is a method to obtain protective coatings on metallic light-weight construction materials. Here, the workpiece receives a strong anodic polarisation in a suitable aqueous electrolyte, which leads to the formation of a passive layer and a gaseous shell. Afterwards, plasma electrolytic discharges appear on the substrate surface and convert it into a ceramic layer. The properties of the passive layer are influenced by the selected substrate/electrolyte combination and are essential for the PEO process-initiation and characteristics. In this work, a new method for the systematic investigation of the substrate/electrolyte interactions during the pre-discharge stage is presented. The procedure is carried out by a polarisation experiment and allows for a quantitative characterisation of the passivation behavior, based on a small electrolyte volume. The method is used to investigate a literature-known electrical conduction mechanism on passive films formed on magnesium, by cross-comparison between different Mg and Al materials. In addition, the influence of phosphate, glycerol, and fluoride on the passivation behaviour of the Mg alloy AZ31 in an alkaline environment is considered and quantified. The results provide an explanatory approach for the positive influence of toxic fluorides within the electrolyte on the morphology of PEO layers on magnesium.

Assessment of Hydroabrasive Wear Resistance of Construction Materials with Functional Coatings, which are Formed by Resource-Saving and Environmentally Friendly Technologies

2020 ◽  
Vol 864 ◽  
pp. 265-277
Author(s):  
Viacheslav Tarelnyk ◽  
Ievgen Konoplianchenko ◽  
Oksana Gaponova ◽  
Bogdan Sarzhanov
Keyword(s):  
Wear Resistance ◽  
Protective Coatings ◽  
Construction Materials ◽  
Thick Layer ◽  
Environmentally Friendly ◽  
Functional Coatings ◽  
Surface Layers ◽  
Resource Saving ◽  
Essential Components ◽  
Hydroabrasive Wear

The work presented in this paper is devoted to the formation of thick-layer wear-resistant coatings by technologies based on electrospark alloying, an example of essential components hardening for the heavy-duty processing equipment operating under hydroabrasive wear conditions. The aim of the paper is to improve the manufacturing and repairing technologies for the helical surfaces of the screws made of 65Г, 30X13 and 40X steels and corrosion-resistant stainless steel 12X18H10T. The above aim has been achieved owing to applying the new environmentally friendly technologies for the formation of the surface layers, and also due to the choice of the surface layers that are most resistant against hydroabrasive wear, which choice being provided for by conducting the comparative tests on the samples made of the above said steel grades and strengthened in various ways. The analysis results of the hydroabrasive wear resistance of the samples made of steel and provided with protective coatings is presented.

Reinforcement Mechanism of Cement/Lime-Fly Ash Treated Sediments as Road Construction Materials

2011 ◽  
Vol 99-100 ◽  
pp. 924-927 ◽  
Author(s):  
Dong Xing Wang ◽  
Hong Xing Wang ◽  
Wen Zhao Chen
Keyword(s):  
Fly Ash ◽  
Mechanical Performance ◽  
Construction Materials ◽  
Road Construction ◽  
Strength Test ◽  
Point Of View ◽  
Environment Friendly ◽  
Reinforcement Mechanism ◽  
Dredged Materials ◽  
Compressive Strength Test

Solidified dredged materials as environment-friendly materials in construction domain are increasingly popular because of their better mechanical performance and low pollution. Based on the physical characteristic of dredged marine sediments, a series of tests, such as unconfined compressive strength test and tensile strength test, were performed to explore the mechanical properties of cement/lime-fly ash treated sediments for the beneficial use in road construction. Finally, the reinforcement mechanism of solidified sediments was explored by SEM tests from the point of view of the formation of CSH phases and the change in microstructure.

scholarly journals Development of Environment-friendly Board in Construction Materials

2005 ◽  
Vol 5 (1) ◽  
pp. 69-74
Author(s):  
Deok-Hyun Seo ◽  
Seong-Sik Kim ◽  
Yong-Sik Jeong ◽  
Nam-Ki Im ◽  
Sang-Beom Lee
Keyword(s):  
Construction Materials ◽  
Environment Friendly
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