Paints and varnishes. Evaluation of degradation of paint coatings. Designation of intensity, quantity and size of common types of defect

1991 ◽  
Keyword(s):  
Paint Coatings

Low-pressure cold metal spray coatings for repair and protection of marine components

2018 ◽  
Author(s):  
M Pal
Keyword(s):  
Marine Environment ◽  
Alloy Coating ◽  
Al Alloy ◽  
Metallic Coatings ◽  
Material State ◽  
Paint Coatings ◽  
And Performance ◽  
Cuzn Alloy ◽  
Cold Metal ◽  
Metal Spray

The marine environment is hostile to most engineering materials, a combination of in-service wear and exposure to marine environment leads to an accelerated material degradation.  Insufficient or poor protection of the substrates further assists the accelerated material degradation in marine environment. There is a direct relationship between the material-state of a ship and its operational capability, readiness, and service life.  The current state-of-the-art practice is to use paint-based coatings to maintain the material-state of ships.  However, the protection offered by paint coatings is usually brief due to inherent permeability and low damage tolerance of these coatings.  For this reason, the paint coatings require renewal at regular intervals, typically less than 5-years, to maintain a minimum level of protection from the marine environment.  The need for regular painting of ships results in a significant negative impact on the through-life availability, operational capability/readiness, and the cost of maintenance/operation of naval ships.  Therefore, the fleet owners and operators should look beyond the conventional paint-based coatings to achieve significant breakthrough improvements in maintaining and enhancing the material-state of naval ships. Metallic coatings, if selected and applied appropriately, will outperform the paint coatings in the marine environment.  Historically, the cost and performance of metallic coatings, mainly thermal metal spray (TMS) coatings, prevented their widespread use in the marine industry.  The TMS coatings also have their own inherent application and performance related limitations that are widely reported in the literature.  However, the cold metal spray (CMS) coating process can overcome the application and performance related limitations that are typically associated with the TMS coatings, therefore creating an opportunity for widespread use of metallic coatings in shipbuilding and fleet upkeep/maintenance. In this paper, the ability of low-pressure (LP-CMS) coatings to repair and reclaim damaged marine components, and application of functional coatings to improve in-service damage tolerance of the damaged/new components is investigated.  The results of the investigation show that two LP-CMS coatings, Al-alloy and CuZn-alloy, can be used to repair and preserve both new and damaged components.  The accelerated salt-spray and natural immersion corrosion testing of the LP-CMS coatings showed that each coating will be better suited to a particular operational environment, i.e. CuZn-alloy coating performed well in both immersion and atmospheric corrosion environments, whereas Al-alloy coating performed well only in atmospheric corrosion environment. 

Preparation and Comparative Analysis of Neem and Dehydrated Castor Seed Oil Alkyd Resin Paint Coatings

2018 ◽  
Vol 2 (10) ◽  
pp. 460-465
Author(s):  
Joshua Omowanle ◽  
◽  
Gbekeayo Ayo ◽  
James Habila
Keyword(s):  
Comparative Analysis ◽  
Alkyd Resin ◽  
Seed Oil ◽  
Castor Seed ◽  
Paint Coatings

scholarly journals Chemical Degradation and Color Changes of Paint Protective Coatings Used in Solar Glass Mirrors

Coatings ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 476
Author(s):  
Mohamed Guerguer ◽  
Sanae Naamane ◽  
Zineb Edfouf ◽  
Olivier Raccurt ◽  
Hassan Bouaouine
Keyword(s):  
Protective Coatings ◽  
Natural Aging ◽  
Attenuated Total Reflection ◽  
Chemical Degradation ◽  
Complete Analysis ◽  
Color Changes ◽  
Colorimetric Measurements ◽  
Marine Site ◽  
Service Conditions ◽  
Paint Coatings

This paper reports a study of the influence of outdoor natural aging on paint coatings applied to the back of three commercial solar glass mirrors (A1, C2, and D2) under two different exposure environments (marine and desert) in Morocco for a period of about three years. The aging assessment was carried out through colorimetric measurements and FTIR-ATR (Attenuated total reflection-Fourier transform infrared) analyses of the top coat paints. The obtained results demonstrate that the tested coating system had a high resistance at the desert site. Under the desert environment, no obvious changes to the coating occurred after 350 days. However, at the marine site, some color changes were detected, and the coating got yellow and more matte, especially for mirror A1. FTIR-ATR analyses have indicated many modifications in the intensity of many bonds of infrared spectra especially for paint of this mirror type (A1). This chemical degradation is not only due to UV degradation but also related to many factors, such as humidity, salinity, and rainfall. This finding was concluded after the faster degradation observed on samples exposed at the marine site. The present study confirms the need to use different exposure environments for testing the limits of new protective systems for solar glass mirrors rather than using only the real service conditions. Finally, accelerated tests are necessary for understanding the effect of each degrading parameter and their results should be compared to outdoor tests data for a complete analysis of coatings durability.

A practice of coulometrically evaluating the protectiveness of paint coatings

2000 ◽  
Vol 36 (2) ◽  
pp. 192-195
Author(s):  
E. Kuzmak ◽  
A. V. Kozheurov ◽  
A. Ya. Lyapunov
Keyword(s):  
Paint Coatings

Effect of low-cycle fatigue on behavior of paint coatings

1978 ◽  
Vol 13 (2) ◽  
pp. 214-215
Author(s):  
Yu. I. Podgornyi ◽  
L. N. Khokhlova ◽  
Yu. G. Ozhiganov
Keyword(s):  
Low Cycle Fatigue ◽  
Cycle Fatigue ◽  
Paint Coatings

3-D tomography by automated in situ block face ultramicrotome imaging using an FEG-SEM to study complex corrosion protective paint coatings

2013 ◽  
Vol 75 ◽  
pp. 376-385 ◽  
Author(s):  
Antony Trueman ◽  
Steven Knight ◽  
John Colwell ◽  
Teruo Hashimoto ◽  
James Carr ◽  
...  
Keyword(s):  
Block Face ◽  
Paint Coatings
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