November, 2015
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Using a flattened top laser to remove paint from metal
Laser cleaning is an environmentally friendly cleaning technique and has attracted much attention in the industry. Due to its superior characteristics, laser cleaning has proved to be very successful in the cleaning of polymers, rubber tire molds, large mirrors,magnetic head sliders,artworks and historical heritage pieces, and semiconductor chips with surface particles. However, the early application of laser cleaning techniques had a relatively low cleaning efficiency. Although there has been successful applications of laser cleaning to remove paint from a metalRead More …
Heat Transfer during solidification of hot dip aluminizing coating
Hot dip aluminizing coating is one of the most effective methods of surface protection for steels and is gradually gaining popularity. Although the pulling speed is one of the most important parameters to control the coating thickness of aluminizing products, however, there are few publications on the mathematical modeling of pulling speed during the hot dip process. In order to describe the correlation among the pulling speed, coating thickness and solidification time, the principle of mass and heat transfer duringRead More …
Corrosion Resistance of Hot dipped Galvalume Coating
Hot-dipped Zn55Al1.6Si galvalume coating has been widely used in many fields such as automobile industry, shipbuilding, machinery industry etc, owing not only to its better anti-corrosive performance than that of Zinc coating,but also to its low cost (the price of Al is lower than that of Zn at present). Rare earths such as La can hinder scale growth and increase scale adhesion, thus they have been employed to protect steels and other metallic alloys against oxidation and corrosion. However, thereRead More …
Study for trilayer antireflection coating using dip coating technique
[State Zhejiang University, Hangzhou 310027, China] [Abstract]We report a new structure for broadband antireflection coating by dip-coating technique, which has minimal cost and is compatible with large-scale manufacturing. The coatings are prepared by depositing SiO2 sol-gel film on a glass substrate, subsequently depositing SiO2 single-layer particle coating through electrostatic attraction, and depositing a final very thin SiO2 sol-gel film to improve the mechanical strength of the whole coating structure. The refractive index of the structure changes gradually from the topRead More …
Anti-corrosion study for chromate-free primer of coil coating
1 Introduction A chromate-free pigment has a good anti-corrosion performance by the functions which passive a surface of a substrate due to its high oxidizability, forms an adamant deposited pellicle comes from reduction products of a chromate, and stabilizes the protective pellicle by a pH buffering. Good anti-corrosion performances like a chromate primer can be expected by the replacement to some pigments which have the similar anti-corrosion function to a chromate pigment. Furthermore, the organic binder’S design of a chromate-freeRead More …
Wet-chemical method on AZ91D magnesium alloy substrate prepare biomimetic hydrophobic surface
1 Experimental [1] Sample preparation The AZ91D magnesium alloy was chosen as experimental material, whose chemical composition was shown in Table 1. The test plates were cut into 10 m×10 mm coupons and polished to 1.5μm mirror finish. The surface was first ground with No.1000 SiC paper, followed by No.1500, No.2000, and finally 1.5μm diamond suspension in oil. The polished specimens were degreased by sonicating in acetone for 10 min, and then methanol for 10 min with a final distilledRead More …
The super-hydrophobic biomimetic surfaces have been studied
The surface properties of materials are very important, and researchers attempt all sorts of methods to obtain materials surfaces with required properties. With the development of bionic engineering, researchers are paying an increasing attention to biological surface in order to understand how the nature can solve engineering problems. The extensive investigations on biological surfaces have revealed that these surfaces have many unusual properties. The “lotus-effect” is a typical phenomenon that the natural surface structure as blueprint is used to designRead More …
Superhydrophobic surface production
People know the self-cleaning lotus effect for many years, but can not make the material as the lotus leaf surfaces. By nature, the typical superhydrophobic surface – study found that lotus leaf, constructed with a special geometry of roughness in the low surface energy solid surface plays an important role on superhydrophobic.Based on these principles, the scientists began to mimic this surface. Now, research on rough superhydrophobic surface has been quite a lot of coverage. In general, the superhydrophobic surfaceRead More …
Explanation of super hydrophobic surface,self-cleaning effect
Wettability is an important feature of the solid surface, which is determined by the chemical composition and morphology of the surface. Super-hydrophilic and super hydrophobic surface characteristics are the main contents of invasive studies. The superhydrophobic (water-repellent) surface generally refers to the surface that the contact angle between water and surface is greater than 150 degrees. That people know superhydrophobic surface is mainly from plant leaves – lotus leaf surface, “self-cleaning” phenomenon. For example, water droplets can roll to rollRead More …
Super hydrophobic coatings create super hydrophobic surfaces
Super-hydrophobic coatings can be made from many different materials. The following are known possible bases for the coating: Manganese oxide polystyrene (MnO2/PS) nano-composite Zinc oxide polystyrene (ZnO/PS) nano-composite Precipitated calcium carbonate Carbon nano-tube structures Silica nano-coating Super-hydrophobic coatings are used to create super hydrophobic surfaces. When water or a water based substance comes into contact with these coated surfaces, the water or substance will “run off” of the surface because of the hydrophobic characteristics of the coating. Neverwet is aRead More …
D5 Creation