scholarly journals Preparation and Characterization of Low Infrared Emissive Aluminum/Waterborne Acrylic Coatings

Coatings ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 35 ◽  
Author(s):  
Xiaoxing Yan ◽  
Lin Wang ◽  
Xingyu Qian
Keyword(s):  
Corrosion Resistance ◽  
Impact Resistance ◽  
Infrared Emissivity ◽  
Drying Time ◽  
Powder Concentration ◽  
Orthogonal Experiments ◽  
Adhesion Level ◽  
Small Change ◽  
Silica Slurry ◽  
The Impact

An aluminum/waterborne acrylic coating was developed by orthogonal experiments, and the gloss, emissivity, chromatic distortion, hardness, adhesion, impact resistance, and corrosion resistance of the coatings were examined. The results showed that the effect of drying time on the infrared emissivity of coatings was more significant than that of the Al powder concentration and nano-silica slurry. When the drying time was prolonged from 0.5 to 6.0 min, the gloss of the coating decreased slowly and the gloss remained low. The infrared emissivity first decreased and then increased. The infrared emissivity of coatings dried for 2.0 min was better. The L’ value gradually decreased and showed a small change of range. With the increasing of the drying time, the hardness of the coating gradually decreased and was the highest at 0.5–2.0 min. The drying time had no effect on the adhesion level. The impact resistance of the coating was better during the drying period of 1.0–3.0 min. The corrosion resistance of the coating was better at 2.0 min. When the drying time was 2.0 min, the waterborne coating showed the better comprehensive performance. This study provides new prospects in using low infrared emissive coatings for infrared stealth and compatibility with visible light.

scholarly journals Preparation and Performance of a Waterborne UV/Al Low Infrared Emissivity Coating

2020 ◽  
Vol 10 (18) ◽  
pp. 6423 ◽  
Author(s):  
Xiaoxing Yan ◽  
Lin Wang
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Orthogonal Experiment ◽  
Uv Curing ◽  
Infrared Emissivity ◽  
Nano Silica ◽  
Uv Curable ◽  
Powder Concentration ◽  
Al Powder ◽  
Silica Slurry

An Al powder filler, nano silica slurry and KH560 were mixed with a prepared waterborne UV-curable coating, and the coating was optimized by an orthogonal experiment. Influences of the Al powder concentration on the gloss, infrared emissivity, brightness, mechanical properties, corrosion resistance and other related properties of the coating were further discussed. The results show that the influence of the Al powder concentration on the gloss was more significant, followed by the UV curing time and nano silica slurry concentration. After studying the key role of the concentration of the Al powder, we found that as the concentration of the Al powder is augmented from 10.0% to 25.0%, the gloss lessened from 19.1% to 8.5%. As the concentration of the Al powder was augmented from 10.0% to 40.0%, the infrared emissivity lessened from 0.649 to 0.083 and the brightness L’ value of the coating was step-by-step augmented and inclined to be stable; in addition, the coating’s mechanical properties reached an excellent level. The coating containing 25.0% Al powder had the best corrosion resistance, surface morphology and comprehensive properties, which can potentially be used for infrared stealth technology.

scholarly journals Effect of Black Paste on the Property of Fluorine Resin/Aluminum Infrared Coating

Coatings ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 597 ◽  
Author(s):  
Yan
Keyword(s):  
Corrosion Resistance ◽  
Impact Resistance ◽  
Engineering Application ◽  
Color Difference ◽  
Infrared Emissivity ◽  
Coating Surface ◽  
Anticorrosive Coatings ◽  
Paste Content ◽  
The Impact

A fluorine resin/aluminum infrared coating was prepared with aluminum using black paste as filler and fluorine resin as binder. The effect of the black paste content on the performance of gloss, color difference, infrared emissivity, hardness, adhesion, impact resistance, roughness, optical testing, and corrosion resistance of the fluorine resin/aluminum infrared coating were examined. When the content of black paste was increased from 1.0% to 9.0%, the gloss of the coating surface decreased; the ΔE* value of the coating decreased; the infrared emissivity of the coating surface increased gradually; the hardness of the coating was 6H; the adhesion grade of the coating was 0; the infrared absorption peak increased gradually. When the content of black paste was 0%–3.0%, the impact resistance was more than 50 kg∙cm, and the impact resistance was higher. When the content of black paste was 0%–5.0%, the surface roughness of the coating was relatively low. When the content of black paste was 1.0%, the corrosion resistance of the coating was the best. The results showed that when the content of black paste was 1.0%, the performance of the whole fluorine resin coating was the best. Through the preparation and characterization of fluorine resin infrared low-emissivity coatings, the possibility of applying fluorine resin to infrared low-emissivity anticorrosive coatings was discussed, which laid a foundation for the subsequent engineering application of coatings.

scholarly journals The Properties of an Aluminum/UV-Curable, Infrared, Low-Emissivity Coating Modified by Nano-Silica Slurry

Coatings ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 382 ◽  
Author(s):  
Xiaoxing Yan ◽  
Yijuan Chang ◽  
Xingyu Qian
Keyword(s):  
Industrial Development ◽  
Impact Resistance ◽  
Uv Curing ◽  
Infrared Emissivity ◽  
Curing Time ◽  
Nano Silica ◽  
Uv Curable ◽  
Orthogonal Experiments ◽  
Key Factor ◽  
Silica Slurry

To improve the performances of UV-curable coatings, the effects of nano-silica slurry, aluminum and UV-curing time on the glossiness and infrared emissivity of UV-curable coatings were investigated by orthogonal experiments. The results showed that UV-curing time is a key factor affecting the performance of the coating. When the UV-curing time was increased from 30 to 360 s, the glossiness of the UV-curable coating slowly decreased from 11.1% to 9.0%. The L’ value decreased from 78.6 to 75.0. The infrared emissivity of the coating with UV-curing time of 180 s was 0.106, which was the lowest. The coating hardness with different curing time was 6H. The coating roughness was high when the UV-curing time was 30–120 s. When the UV-curing time was greater than 300 s, the coating adhesion was 0 and the coating had the best impact resistance of 500 N/cm. The overall performance of the aluminum/UV-curable coating was optimal when the UV-curing time was 180 s. This research is able to promote the industrial development of UV-curable, infrared, low-emissivity coatings.

The Study of Color Film Phosphating Process in Steel before Coating

2012 ◽  
Vol 581-582 ◽  
pp. 1088-1091 ◽  
Author(s):  
Ze Min Chen ◽  
Zhi Li Wu ◽  
Qiao Yun Zhang
Keyword(s):  
Phytic Acid ◽  
Impact Resistance ◽  
Sodium Molybdate ◽  
Good Adhesion ◽  
Color Film ◽  
Orthogonal Experiments ◽  
Crystal Film ◽  
Film Forming ◽  
The Stability ◽  
The Impact

This study through a lot of theoretical analysis and experimental exploration, come to add phytic acid and chromium alum in the traditional zinc phosphating solution for phosphating solution film-forming speed and improve the film density has a distinct effect, and further by orthogonal experiments and the final assessment of preferred a group of environmental, low-temperature, and no sediment of new phosphating process. The composition of the phosphating solution is as follow: zinc oxide 0.5g/L; phosphating acid 5.0mL/L; tartaric acid 0.75g/L; sodium molybdate 0.6g/L; Ma Jif salt 2.0g/L; NaF 0.25g/L; phytic acid 0.4mL/L; chromium alum 1.0g/L; free acidity 2-4 points; total acidity 15-18 points. The experimental results show that: the new phosphating process of this study reduces the handling costs, the stability bath performance, little changes in acidity, in the case of do not need to adjust the surface at room temperature, to forming a completed, dense, strong corrosion-resistant color phosphate crystal film on metal surface within 5 minutes, the copper sulfate bit time is 2.5mins, with good adhesion to 0, the impact resistance is 50kg/cm, it can be used in conjunction with a variety of coating processes.

scholarly journals Effect of Different Color Paste on Properties of Fluorine Resin/Aluminum Infrared Low Emissivity Coating

Coatings ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 70 ◽  
Author(s):  
Xiaoxing Yan
Keyword(s):  
Corrosion Resistance ◽  
Visible Light ◽  
Water Resistance ◽  
Salt Water ◽  
Impact Resistance ◽  
Resistance Test ◽  
Infrared Emissivity ◽  
Electrochemical Polarization ◽  
Black Coating ◽  
Different Color

The effect of the four kinds of red, dark yellow, purple, and black pastes on the properties of fluorine resin/aluminum low emissivity coating was studied. The infrared emissivity coatings with red and black pastes were higher than the coatings with dark yellow and purple pastes. The hardness of the coatings with red, dark yellow, and purple color pastes was 6H, and that with black pastes was 6B. The adhesion and impact resistance of dark yellow coating was better, followed by red and purple, and the adhesion and impact resistance of black coating was the worst. Electrochemical polarization curves indicated that fluorine resin coatings with purple paste had better corrosion resistance. After the salt water resistance test, there was no obvious loss of light in the coatings with the four kinds of color pastes. The purple paste coating had no obvious loss of light and less bubble, suggesting that the fluorine resin/aluminum low emissivity coating with purple paste had better performance. The results of this study provide a new prospect for the application of infrared low emissivity coating in infrared stealth and compatibility with visible light.

scholarly journals The impact of drying on bioactive compounds of blue honeysuckle berries (Lonicera caerulea var. edulis Turcz. ex Herder)

2020 ◽  
Vol 79 (1) ◽  
pp. 68-77 ◽  
Author(s):  
Mateja Senica ◽  
Franci Stampar ◽  
Sezai Ercisli ◽  
Barbara Sladonja ◽  
Danijela Poljuha ◽  
...  
Keyword(s):  
High Performance ◽  
Heating Temperature ◽  
Drying Time ◽  
Lonicera Caerulea ◽  
Primary And Secondary Metabolites ◽  
Higher Temperature ◽  
Small Change ◽  
The Impact ◽  
Duration Of Heating ◽  
Blue Honeysuckle

Drying fruit is one of the simplest ways to extend the shelf-life of fruit, especially berries. Both higher temperature and time of heating significantly change the contents of some primary and secondary metabolites in honeysuckle fruit. Differences in their contents arising from different heat treatments were determined with the aid of high-performance liquid chromatography (HPLC) coupled with mass spectrophotometry (MS). The content of sugars showed a small change with drying, while organic acid contents decreased with a longer drying time. Ascorbic acid was totally degraded, regardless of the time or heating temperature. Different phenolic groups responded differently to heat intensity and time of drying. Flavanols were more sensitive to higher temperature than to duration of heating and they decreased by more than 70% at 75 °C. In contrast, the content of hydroxycinnamic acids, increased with drying by more than 75%, regardless of the time and temperature.

scholarly journals A grinding-burnishing approach to enhancing surface integrity, tribological and corrosion behaviour of laser-cladded AISI 431 alloys

2021 ◽  
pp. 1-15
Author(s):  
Mohammad Uddin ◽  
Remi Santifoller ◽  
Colin Hall ◽  
Thomas Schlaefer
Keyword(s):  
Corrosion Resistance ◽  
Surface Integrity ◽  
Performance Enhancement ◽  
Corrosion Behaviour ◽  
Impact Resistance ◽  
Corrosion Current ◽  
Surface Alteration ◽  
Modification Technique ◽  
And Performance ◽  
The Impact

Abstract This paper presents the influence of the grinding-burnishing on surface integrity and corrosion performance of the laser-cladded AISI 431 alloys. As-cladded specimens were first ground followed by plasticity ball burnishing. To evaluate surface alteration and performance enhancement, six major properties were measured and analysed in terms of surface roughness, porosity, microhardness, wear, and impact and corrosion resistance. Results showed that grinding-burnishing significantly improved the surface finish by lowering Ra and Rz by up to 29% and 41%, respectively, compared to grinding, while surface porosity was found to decrease by 18%. Maximum surface microhardness increased by 32% when grinding-burnishing, with a modified depth of up to 250 μm, while wear resistance increased by up to 38%. Because of hardness improvement, the grinding-burnishing increased the impact resistance by lowering the maximum indent depth by 29%. The corrosion resistance improved by increasing positive corrosion potential from − 0.31 V (grinding) to − 0.21 V (grinding-burnishing) and lowering corrosion current density from 1.18 × 10−3 A.cm−2 (for grinding) to 2.1 × 10−5 A.cm−2 (grinding-burnishing). Burnishing further induced grain modification in terms of grain deformation and flattening within microstructure, but no significant grain refinement was observed. XRD results however showed lattice deformation indicating potential compressive residual stress generated by burnishing. Overall, it is imperative to say that the combined grinding-burnishing can be a viable surface modification technique to extend functional service life of the laser-cladded components.

scholarly journals Preparation of WC Reinforced Co-Based Alloy Gradient Coatings on a H13 Mold Steel Substrate by Laser Cladding

Coatings ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 176
Author(s):  
Chenchen Li ◽  
Xuefeng Yang ◽  
Shouren Wang ◽  
Yanjun Wang ◽  
Jinlong Cao
Keyword(s):  
Corrosion Resistance ◽  
Wear Mechanism ◽  
Steel Substrate ◽  
Substrate Surface ◽  
Impact Resistance ◽  
Surface Hardness ◽  
Wear Loss ◽  
Stress Relieving ◽  
Gradient Coatings ◽  
The Impact

H13 die steel often fails as a result of physical and chemical effects such as wear, erosion and cyclic stress. Accordingly, the study evaluates Co-based gradient coating on an H13 steel featuring a stress-relieving effect. Scanning electron microscope and X-ray diffraction were used to analyze the microstructure and phase of the coatings. A microhardness tester and friction and wear tester were used to compare the hardness and wear resistance of the coatings and the substrate, and the wear morphology was observed. A pendulum impact test was used to compare the impact resistance of the coatings and the substrate, and the fracture morphology was observed. Finally, a corrosion test was used to compare the corrosion resistance of coatings and substrate. The results show that the Co-based gradient coatings have good combinations with the substrate, the hard phase content gradually increases from the bottom to the top of the coating, and the crystal microstructure generally maintains a distribution trend from coarse to fine. The hardness of the gradient coatings is significantly higher than the substrate, and from the coating surface to the substrate, the hardness decreases slowly. The wear loss of the coatings is much lower than that of the substrate, the main wear mechanism of the substrate is abrasive wear, and the main wear mechanism of the coatings is brittle spalling. While the gradient coatings increase the surface hardness, the brittleness also increases, the impact resistance of the coatings is lower than that of the substrate, the fracture form of the substrate is a ductile fracture, and the fracture form of the coating is a brittle fracture. The gradient coatings effectively improve the corrosion resistance of the substrate surface, and the higher the content of the reinforcing phase, the better the corrosion resistance of the coatings.

Effect of combined drink cans and steel fibers on the impact resistance and mechanical properties of concrete

2020 ◽  
Vol 14 (2) ◽  
pp. 6734-6742
Author(s):  
A. Syamsir ◽  
S. M. Mubin ◽  
N. M. Nor ◽  
V. Anggraini ◽  
S. Nagappan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Reinforced Concrete ◽  
Impact Resistance ◽  
Fiber Reinforced Concrete ◽  
Steel Fibers ◽  
Fiber Reinforced ◽  
Indirect Tensile ◽  
The Impact

This study investigated the combine effect of 0.2 % drink cans and steel fibers with volume fractions of 0%, 0.5%, 1%, 1.5%, 2%, 2.5% and 3% to the mechanical properties and impact resistance of concrete. Hooked-end steel fiber with 30 mm and 0.75 mm length and diameter, respectively was selected for this study.  The drinks cans fiber were twisted manually in order to increase friction between fiber and concrete. The results of the experiment showed that the combination of steel fibers and drink cans fibers improved the strength performance of concrete, especially the compressive strength, flexural strength and indirect tensile strength. The results of the experiment showed that the combination of steel fibers and drink cans fibers improved the compressive strength, flexural strength and indirect tensile strength by 2.3, 7, and 2 times as compare to batch 1, respectively. Moreover, the impact resistance of fiber reinforced concrete has increase by 7 times as compared to non-fiber concretes. Moreover, the impact resistance of fiber reinforced concrete consistently gave better results as compared to non-fiber concretes. The fiber reinforced concrete turned more ductile as the dosage of fibers was increased and ductility started to decrease slightly after optimum fiber dosage was reached. It was found that concrete with combination of 2% steel and 0.2% drink cans fibers showed the highest compressive, split tensile, flexural as well as impact strength.    

Sign in / Sign up

Export Citation Format

Share Document