Electrodeposition painting

Anodic deposition is controlled by either fluid shear (cross-flow filtration) (48), similar to gel-polarization control, or by continual anode replacement (electrodeposited paints) (46). High fluid shear rates can cause deviations from theory when E > (49). The EUF efficiency drops rapidly... 

Folonari, C. V. and Garlasco, R., Ion-paired HPLC characterization of cathodic electrodeposition paint polymers, /. Chromatogr. Sci., 19, 639, 1981. 

Resource recovery—recovery of inks, textile sizing agents, and electrodeposition paints. 

Reiter, S. Ruhlig, D. Ngounou, B. Neugebauer, S. Janiak, S. Vilkanauskyte, A. Erichsen, T. Schuhmann, W., An electrochemical robotic system for the optimization of amperometric glucose biosensors based on a library of cathodic electrodeposition paints, Macromol. Rapid Commun. 2004, 25, 348-354... 

Smutok, O. Ngounou, B. Pavlishko, H. Gayda, G. Gonchar, M. Schuhmann, W., A reagentless bienzyme amperometric biosensor based on alcohol oxidase/peroxidase and an os-complex modified electrodeposition paint, Sens. Actuator B-Chem. 2006,113, 590-598... 

Schuhmann et al. introduced the use of electrodeposition paints (EDPs) as immobilization matrices for biosensors [17[. Following work enabled the incorporation of redox mediators into the polymer structure of EDPs [18. 146]. 

D.A., Sultanov, Y.M., Efendiev, A.A., and Schuhmann, W. (2007) Parallel synthesis of libraries of anodic and cathodic functionalized electrodeposition paints as immobilization matrix for amperometric biosensors. Bioelectrochemistry, 71 (1), 81-90. 

Solution stability of the aqueous resin system is also a key factor with regard to co-solvents for electrodeposition paints. It was determined at both room temperature and 40°C. The criteria used were pH, conductivity, and haze. Haze is a function of light transmission at 5560 A and was measured using a Cary model 14 spectrometer. All tests were run in sealed containers. 

Effect of Solvents on Properties of Latex and Electrodeposition Paints... 

The field of application for GDOES is very broad and includes surface treatment studies of samples prepared by different techniques such as galvanization, nitriding, carbonitriding, carburization, diffusion, chemical and thermochemical treatments, thermic treatments, PVD and CVD coating, electrodeposition, painting, and semiconductor multilayer growth. 

Waterborne paints provided the technological basis for electrodeposition paints (Section 3.8), in which negatively charged paint particles (anaphoresis, industrial introduction at the beginning of the 1960s), or positively charged paint particles (cataphoresis, industrial introduction at the end of the 1970s) are deposited from aqueous solution onto metallic substrates by application of an electrical field [3.40]. 

Table 3.11. Typical bath and application data of electrodeposition paints...

Environmental Protection. On account of the high paint transfer efficiency and low solvent content, environmental pollution in electrodeposition coating is much lower than with spray coating. The solvent contents of electrodeposition paints relative to the solids content are 5-10% in comparison with solventborne spray paints with a solvent content of 50-100%. The most important sources of emission are the electrodeposition tank, the rinsing zone, the stoving oven, and the drain of the ultrafiltrate [3.125]. Developments in new electrodeposition paints aim to reduce the organic volatile solvent content, to have fewer condensation products in the stoving ovens, and to have lead-free formulations [3.126]. 

Uses. Electrodeposition coatings are used primarily for corrosion protection of steel, galvanized steel, and aluminum (e.g., in automobiles, agricultural machinery, steel furniture, and appliances). New areas of application include coil coating primers [3.127], beverage can coatings [3.128], and photocurable electrodeposition paints as photoresists [3.129]. 

Electrodeposition. Electrodeposition paints are suspensions of binders and pigments in fully demineralized water with low concentrations (ca. 3 %) of organic solvents (see Section 3.8). Electrodeposition coating may be either anodic or cathodic. 

Anticorrosive Primers. Anticorrosive primers are applied in dip tanks so that they reach all parts of the car body dipping is a fast method of application. The standard method for application of primers is electrodeposition. Anodic electrodeposition paints were used when the electrocoating technique was first applied, but cathodic electrodeposition is now predominant because it provides better corrosion protection. 

Although the dry film thickness on the metal edges is somewhat lower, these areas are still efficiently protected against corrosion. The ultrafiltration technique results in a very high transfer effect and a uniform coating paint solids from the bath are deposited on the metal surface without loss. Since electrodeposition paints have a low organic solvent content, air pollution is low. The dip tank contents are not flammable, which reduces insurance costs [11.5]. 

Certain components of domestic appliances are also coated with electrodeposition paints. Two-pack polyurethanes are applied if the dimensions of the parts are too large for the electrodeposition bath. These paints dry at ambient temperature to give films with similar properties to stoving acrylic enamels. Solvent-free powder coatings are also used to coat domestic appliances. Nowadays powder coatings and precoated metal (coil coating) are gaining more importance. 

Uses Intercoat adhesion promoter for paint films, stoving paints, fastdrying air-drying paints on electrodeposition primers, wh. electrodeposition paints and primers... 

Emulsions made by mechanical means, using external surfactants and colloids, are not popular in paints today, being formerly used in oil-bound distempers, based on drying oil emulsions. Nowadays, mechanical emulsification is generally used with resins which are internally modified to emulsify in water, e.g. in electrodeposition paints (see p. 109). 

Electrodeposition paint from wash and rinse baths... 

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