Cathodic Electronica Deposition Essay

Electrodeposition

Coating

Process

for Automobile

Bodies*

By simply Yoshiaki 0YABU, ** Nobuo FURUNO, *** Yoji HIRASAWA*** and Hiroshi OMORI **** Synopsis The sooner electrodeposition processwas mainlypursuitedfor the quality control regarding mass production. However , the coating performance was found to be a dramon problemfrom a standpoint with the harmony among natural circumstancesand human's living-life conditions and the recovery using the paint was earnestlysearched. This trend led to the expansion in various technicalfields. The second push on even more improvementof electrodeposition paint was due to olive oil crisis in 1973. The newest technology in relation to save-energy was created. In thepaint industries, the further improvedanti-corrosive performance was strongly demanded. This demand also involvedthe developmentof new materials pertaining to automobile systems and even the appearance of bodiesstructure. In this report, the development of electrodeposition process into automobile industries in Japan is definitely hystrically reviewedand the electrodeposition mechanismand the mechanism which in turn deposited elements from the coating film will be briefly described. As the demandfor anti-corrosiveperformance is improved, the coating system in which the anodic oxidation and the dissolutionfrom the object material can not occur, was directed and recentlyit was quickly accepted because the remarkable system. Alternatively, there is a great oppositeopinionfor this trend on the basis of the steel analysis detectedin the placed film. The functions of cationic electrodeposition, especially, the excellent corrosion amount of resistance with regard to the metal dissolution in the wholeelectrodeposition processis explained. In Part III, throwingpower which is attribute for electrodeposition processis explained. It is known that throwingpower is definitely not determined by the paint efficiency. Even the electrodeposition coating system, the areas into which the fresh paint liquid will not intrude cannot be coated. And it is pointed out that the style of bodiesstructure is usually inevitablynecessaryas very well as the improvement paint shows. of In Chapter 4, the role of the key component, vehicleresin, is introduced. The deviceswhich disperse resin into solvent` water', and factors which will determine the polarity of electrodeposition explained. And the will be typical botanical structure can be shown. The paint performanceis greatly impacted by the vehicleresin, but it is usually deeplyrelated how thepaint is usually produced and exactly how it is lined. Therefore , it can be inferred that thepaint shows are relativelyestimated. In Phase V, the entire system of electrodepositioncoating process is given. The alleged ` closed-loopsystem' which is extremely characteristic in electrodeposition method, and which can be suitably built in for mass production of automobile systems is discussed. Besides, the pH control technologyof color bath as well as the possibility about its future expansion are referenced. Thefurther improvement the recycleusage technology farreneheit paint of o is definitely pointed out plus the possibility to replyfor the social needssuch as saveenergyand lesspolution is usually explained. In Chapter MIRE, thepresent status of electrodeposition processand numerous technicalproblemsare explained. The synopsis of this assessment and authors' views intended for future creation are given in thefinal phase.

I.

Launch The development of the electrodeposition finish

technology in automobile bodies industry started around 1964 in The japanese. In those days, dip coating of water-borne paint was placed on automobile parts after metal pretreatment, and it was verified when ac electricity was used, the vehicle was deposited in the electrode. It was the beginning of electrodeposition coating. Yet , the essential point of this technology was not correctly comprehended, while the unpublished work was progressing. Before 1963, the small goods to which acrylic emulsion was mainly utilized had been made industrially. In Great...



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