Anodic electrocoating system

Both anodic and cathodic electrocoating systems are in use. The anodic systems contain carboxylated polymers where the acid groups are neutralized with amines or KOH. The cathodic systems contain amino-functional resins where the amine groups are neutralized with an acid. 

Electrocoating vehicles were initially prepared from natural oils and maleic anhydride (21). Those adducts can then be solubilized by ammonia or other bases. Electrocoating resin systems were initially anodic because of ease of preparation and availability of acidic monomers. About 10 years after the introduction of anodic electrocoating, cathodic electrocoating was developed by Bosso and first successfully applied to air conditioner compressors (22. 23). 

Two types of system are available anodic and cathodic. The cathodic electrocoating system is the most common with the part to be coated given a negative charge, attracting positively... 

The aliphatic amines are valuable intermediates for chemical synthesis applications, Reaction of ethylamine with cyanuric chloride yields triazine-type herbicides, Diethylamine is used in the preparation of vulcanization accelerators where reaction with carbon disulfide yields a dithiocarbamate. Triethyl-amine is used as an acid acceptor in chemical syntheses and as a salt former in various purification processes. The amine is used as a corrosion inhibitor in aqueous systems, as a catalyst in polyurethane applications, in textile and photographic applications, and in anodic electrocoating. 

Many automobiles and appliances are coated with a waterborne primer applied by electrodeposition in a process called electrocoating. The metal car or appliance is one electrode. Either anodic or cathodic electrodeposition can be used. This is better than a spray system with solvent in... 

After the successful introduction to appliances, the automotive industry began a major conversion to cationic electrocoating. Advantages of the system are good chemical resistance, excellent salt spray resistance, hardness of 4H+, flexibility, and low dissolution of phosphate at the anode (33). 

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