Fighting Cylinder Corrosion
Page 52
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OONVINCING evidence of the proteck-• tion against corrosion afforded by Adcoid tablets was afforded by a demonstration given, on Monday, by Alexander Duckham and Co., Ltd., Duckham House, 16-18, Cannon Street, London, E.C.4.
The plant used for the experiment comprised two water jackets, to each of which six slips of cast iron, cut from a broken cylinder block and machined, ground and polished, were soldered.
All but one of the slips were treated with oil mixed with eight times its volume of petrol (to facilitate even spreading of the lubricant over the surface), with Adcoid, with a combination of oil and Adcoid, and with other upper-cylinder lubricants. One slip remained untreated.
The water-jacketed plates were connected by tubing to the cooling system of a car engine and to a cold-water supply. To begin with, hot water was passed through the jackets to evaporate £34 the petrol on the test slips. Each plate was then covered with a bell jar connected with the exhaust pipe of the engine.
Moisture from the exhaust gases was deposited on the bell jar and, after a few minutes' running, the plate was cooled by switching over to the. coldwater supply, moisture then being left on the slips. The exhaust gases were shut off, the bell jar removed and the plate warmed up in order to drive off the condensed moisture.
Examination of the various test slips showed that those which had been treated with Adcoid, or with a combination of this substitute and oil,. exhibited less tendency to corrosion than those upon which a film of ordinary oil had been deposited. The Adcoid-treated slip remained bright, whereas the others were, to some extent, corroded, the worst example being that which had not been covered with any, kind of oil.