scholarly journals Cover Picture: Graphene and Graphene/Polymer Composites as the Most Efficient Protective Coatings for Steel, Aluminum and Copper in Corrosive Media: A Review of Recent Studies (Chem. Rec. 6/2020

2020 ◽  
Vol 20 (6) ◽  
pp. 466-466
Author(s):  
Ali Ehsani ◽  
Ali Akbar Heidari ◽  
Maryam Sajedi
Keyword(s):  
Polymer Composites ◽  
Protective Coatings ◽  
Corrosive Media ◽  
Protective Coatings For Steel

scholarly journals Thermally Assisted Machine Hammer Peening of Arc-Sprayed ZnAl-Based Corrosion Protective Coatings

2021 ◽  
Vol 5 (4) ◽  
pp. 109
Author(s):  
Andreas Wirtz ◽  
Mohamed Abdulgader ◽  
Michael P. Milz ◽  
Wolfgang Tillmann ◽  
Frank Walther ◽  
...  
Keyword(s):  
Residual Stresses ◽  
Protective Coatings ◽  
Fatigue Behavior ◽  
Wind Waves ◽  
Offshore Wind ◽  
Coating Materials ◽  
Corrosive Media ◽  
Machine Hammer Peening ◽  
Hammer Peening ◽  
Compressive Residual Stresses

Structural elements of offshore facilities, e.g., offshore wind turbines, are subject to static and dynamic mechanical and environmental loads, for example, from wind, waves, and corrosive media. Protective coatings such as thermal sprayed ZnAl coatings are often used for protection, mainly against corrosive stresses. The Machine Hammer Peening (MHP) process is an innovative and promising technique for the post-treatment of ZnAl coating systems that helps reducing roughness and porosity and inducing compressive residual stresses. This should lead to an enhancement of the corrosion fatigue behavior. In this paper, the effect of a thermally assisted MHP process was investigated. The softening of the coating materials will have a direct effect on the densification, residual porosity and the distribution of cracks. The investigation results showed the influence of thermally assisted MHP on the surface properties, porosity, residual stresses, and hardness of the post-treated coatings. The best densification of the coating, i.e., the lowest porosity and roughness and the highest compressive residual stresses, were achieved at a process temperature of 300 °C. A further increase in temperature on the other hand caused a higher porosity and, in some cases, locally restricted melting of the coating and consequently poorer coating properties.

Investigating protective coatings for steel

1993 ◽  
Vol 70 (10) ◽  
pp. 843
Author(s):  
Tom Runyan ◽  
Mary Herrmann
Keyword(s):  
Protective Coatings ◽  
Protective Coatings For Steel

Plasma Spray Deposition Processes

MRS Bulletin ◽  
1988 ◽  
Vol 13 (12) ◽  
pp. 60-67 ◽  
Author(s):  
Herbert Herman
Keyword(s):  
High Temperature ◽  
Plasma Spraying ◽  
Protective Coatings ◽  
Spray Deposition ◽  
Substrate Surface ◽  
Extractive Metallurgy ◽  
Thermal Plasmas ◽  
Corrosive Media ◽  
Wide Range ◽  
Deposition Processes

The concept of plasma is central to many scientific and engineering disciplines—from the design of neon advertisement lights to fusion physics. Plasmas vary from low density, slight states of ionization (outer space) to dense, thermal plasmas (for extractive metallurgy). And plasmas are prominent in a wide range of deposition processes — from nonthermal plasma-activated processes to thermal plasmas, which have features of flames and which can spray-deposit an enormous variety of materials. The latter technique, arc plasma spraying (or simply, plasma spraying) is evolving rapidly as a way to deposit thick films (>30 μm) and also freestanding forms.This article will review the technology of plasma spraying and how various scientific disciplines are contributing to both an understanding and improvement of this complex process.The plasma gun dates back to the 1950s, when it was introduced for the deposition of alloys and ceramics. Due to its high temperature flame it was quickly discovered that plasmas could be used for depositing refractory oxides as rocket nozzle liners or to fabricate missile nose cones. In the latter technique, the oxide (e.g., zirconia-based ceramics, spinel) was sprayed onto a mandrel and the deposited material was later removed as a free-standing form.The technique's versatility has attracted considerable industrial attention. Modern high performance machinery is commonly subjected to extremes of temperature and mechanical stress, to levels beyond the capabilities of present-day materials. It is becoming increasingly common to form coatings on such material surfaces to protect against high temperature corrosive media and to enhance mechanical wear and erosion resistance. Several thousand parts within an aircraft gas turbine engine have protective coatings, many of them plasma sprayed. In fact, plasma spraying has emerged as a major means to apply a wide range of materials on diverse substrates. The process can be readily carried out in air or in environmental chambers and requires very little substrate surface preparation. The rate of deposit buildup is rapid and the costs are sufficiently low to enable widening applications for an ever increasing variety of industries.

Effect of Epoxy Binder on Fire Protection and Bonding Strength of Intumescent Fire Protective Coatings for Steel

2010 ◽  
Vol 168-170 ◽  
pp. 1228-1232 ◽  
Author(s):  
Ming Chian Yew ◽  
Nor Hafizah Ramli Sulong
Keyword(s):  
Thermal Stability ◽  
Fire Protection ◽  
Bonding Strength ◽  
Protective Coatings ◽  
Steel Structures ◽  
Bunsen Burner ◽  
Foam Structure ◽  
Char Layer ◽  
Epoxy Emulsion ◽  
Protective Coatings For Steel

This study focuses on the effect of epoxy emulsion, a binder for producing water-borne intumescent fire protective coating for steel structures. The influence of binder on the fire resistive performance, char formation, thermal stability and bonding strength of the coatings were investigated in detail by using Bunsen burner test, thermogravimetry analysis (TGA), field emission scanning electron microscopy (FESEM) and Instron microtester. It was found that the fire protection performance and foam structure of coating sample D2 was significantly improved by adding 10wt% of epoxy resin which produced the greatest thickness of char layer. In addition, TGA results showed that the residue weight of coating D2 was higher than coating sample D3 with 15wt% of epoxy. This indicated that sample D2 has better anti-oxidation and thermal stability. The results of Instron microtester indicated that the bonding strength of the coatings was improved with the increase of epoxy content.

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