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MORE DURABLE PISTON RINGS CHROMIUM-PLATED piston rings

22nd December 1961, Page 50
22nd December 1961
Page 50
Page 50, 22nd December 1961 — MORE DURABLE PISTON RINGS CHROMIUM-PLATED piston rings
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have been used to minimize corrosiert caused by sulphur in diesel fuel, but, the plated deposits tend to bleak up when the ring is expanded for placing in position. Such are the views expressed in patentNo 874,191, which shows an improved scheme in which the piston

ring grooves are plated rather than the rings. (California Research Corp., 200 Bush Street, San Francisco 4, California, U.S.A.) It is suggested that the hard chromium layer is deposited on the horizontal faces of the ring grooves as shown at 1. The thickness of the deposit is from .003 to .010 in. The rings are preferably made from an alloY having resistance to corrosion. The scheme may also be used to build up worn pistons.