scholarly journals Evolution of EIS properties of composite polymer protective coatings in corrosive media

2021 ◽  
Vol 10 (4) ◽  
Keyword(s):  
Protective Coatings ◽  
Composite Polymer ◽  
Corrosive Media

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.

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.

Tannic acid-modified fatty amide anticorrosive coatings from Pongamia glabra oil

2014 ◽  
Vol 61 (4) ◽  
pp. 232-240 ◽  
Author(s):  
Manawwer Alam ◽  
Naser M. Alandis
Keyword(s):  
Tannic Acid ◽  
Seed Oil ◽  
Protective Coatings ◽  
Thermal Analyses ◽  
Ac Impedance ◽  
Fatty Amide ◽  
Condensation Polymerization ◽  
Corrosive Media ◽  
Content Type ◽  
Pongamia Glabra

Purpose – The purpose of this investigation was to develop sustainable resource-based anticorrosive coating material using Pongamia glabra seed oil and tannic acid (TA), as well as to improve the coating properties. Design/methodology/approach – TA-modified fatty amide diol was synthesized by condensation polymerization. First, Pongamia glabra seed oil was converted to fatty amide diol (Pongamia oil fatty amide, PFA) that was further modified by TA with different parts per hundred of resin (10, 15 and 20) to develop a polyether fatty amide (PFA-TA). The confirmation of reaction between TA and PFA was carried out using Fourier transform infrared spectroscopy. The thermal behavior of PFA-TA was studied by thermogravimetric analyses. Coatings of several PFA-TA resins were applied to steel (i.e. plain carbon steel) coupons to investigate their physico-mechanical and anticorrosive performance. The corrosion protection performance was observed using AC impedance and polarization tests. Findings – TA-modified fatty amide coatings showed the highest scratch hardness of 2.5 kg, flexibility (1/8 inch) and gloss at 45° was 60-62. Among all compositions, PFA-TA15 showed the best physico-mechanical and anticorrosion performance. Corrosion tests of coated panels were examined in different corrosive media (3.5 wt per cent HCl, 3.5 wt per cent NaOH and 5.0 wt per cent NaCl) using potentiodynamic polarization and AC impedance measurements. PFA-TA may find application as an eco-friendly protective coating, and thermal analyses revealed that it can be safely used up to 300°C. Originality/value – This paper provides the development of protective coatings for steel from non-edible seed oil and TA to utilize sustainable resources.

scholarly journals DEVELOPMENT OF THE COMPOSITION OF A COMPOSITE MATERIAL BASED ON THERMOREACTIVE BINDER ED-20

2021 ◽  
pp. 35-38
Keyword(s):  
Protective Coatings ◽  
Polymeric Materials ◽  
Interpolation Formula ◽  
Polymer Materials ◽  
Complex Configuration ◽  
Technological Equipment ◽  
Technological Properties ◽  
Composite Polymer ◽  
Lagrange Method ◽  
Large Size

The aim of the study is to determine the effect of the type of structural modifier and filler on the structure formation and technological properties of potting composite polymeric materials (HCPM) and protective coatings for sheet and complex-configuration technological equipment, taking into account their rheological properties. Compositions of composite polymer materials based on a thermosetting binder of epoxy-diane resin ED-20 filled with a mineral filler - kaolin modified with gassipol resin (GS) - were developed using Newton's interpolation formula and the Lagrange method. The optimal amount of gossypol resin determined in the composition of the composite – in the amount of 6-10 mass., including in relation to sheet coverings and 8-12 wt. h. for parts of large-size complex-configuration technological equipment

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