Leyland Combating Corrosion
Page 61
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A NEW department devoted solely to I-1 providing protection from corrosion on vehicle components has been placed in operation at the Farington factory of Leyland Motors, Ltd. It covers an area of over 7,000 sq. ft. All cast-iron and malleable-cast-iron components are shotblasted, painted and force-dried. Steel items are phosphated.
A large four-table Wheelabrator is used for the shot-blasting process, and from this machine the east-iron units then pass through a water-wash paint-spray booth on a conveyor travelling at 4 ft. Per minute. In this booth red oxide of iron zinc chromate primer is applied, after which the castings pass through a 15-ft.long infra-red stoving oven at a temperature of 450 degrees F.
Four gas-heated baths are used for the phosphating process. These are arranged in a horseshoe pattern and served by five 10-cwt. electric overhead cranes. Components for phosphating are first degreased in a trichlorethylenevapour tank, and then immersed in phosphating solution for 20 minutes at a solution temperature of 210 degrees F.
After rinsing in the two final baths at 180 degrees F., the units are transferred
to the paint-spray conveyor.