From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Article discussing the properties, processes, and applications of various chemical coatings for improving wear-resistance and anti-corrosion on automotive parts.
| Identifier | ExFiles\Box 142\2\ scan0430 | |
| Date | 15th April 1939 | |
| 493 Research has brought to the front a new technique. The practice bids for a broad scope of application so here are some unique properties of and Chemical Coatings. as the anodizing of aluminum pistons, tin-plating of aluminum and cast iron pistons, cadmium plating. Interesting point about the coatings intended for wear-resistance is that, in the main, expected life of the coating is very brief, usually not much longer than the initial break-in period. Naturally, this period varies as to the number of hours or mileage, according to the application. However, regardless of its life, the coating unquestionably appears to perform its intended function of reducing or entirely banishing initial wear, improving life of the wearing surfaces for the duration of their useful service period. Consider now some examples of current practice which, in our opinion, not only are indicative of the scope of application but may direct the thinking of engineers and production men to other uses where corrosion-resistance, self-lubricating properties, and initial break-in wear and scuffing control are problems of major consideration. The following list gives the names of Buick parts treated with Parker Bonderite and colloidal graphite, principally for the purpose of resisting corrosion and providing self-lubricating properties, although several of the parts also provide resistance to wear. Torque ball mounting stud Clutch release rod adjusting nut assembly Clutch retainer lever spring pin Clutch retainer lever spacer pin O.P. Idler gear pins Second speed gear thrust washer Clutch retainer lever assembly Clutch yoke ball stud Clutch release lever pivot screw The process used in applying the protective Bonderite coating at Buick is as follows: 1. Clean — Degreaser or alkaline wash. 2. Hot water rinse. 3. Process in Bonderite “D”. 4. Hot water rinse. 5. Air dry. 6. Immerse in graphited soluble oil solution. 7. Air dry. According to a report from the Parker Rust-Proof Co., the combination of Bonderite and colloidal graphite surface treatment described above, is in use by others for the treatment of piston rings, clutch levers, clutch drive plates, camshafts, valve shafts, push rods, valve guides, axle shafts, ring gears and pinions, thrust washers and spacers. The Parker engineering department also recommends this treatment for improving the bearing quality of any steel. In addition to the parts listed above, Buick uses two makes of surface treated rings—Ferrox rings supplied by Perfect Circle and Granoseal-treated rings supplied by Sealed Power. Carl T. Doman, V.{VIENNA}-P., Air Cooled Motors Corp., tells us that for some time they have been treating the camshafts of the 4AC-150 aircraft engines with the Bonderite process. This has resulted in the complete elimination of the original difficulty of undue wear on the cam nose during initial break-in. More recently, the hydraulic valve lifters for the same engine have been Granodized (A.C.P. process) with a consequent improvement in life of both lifters and camshaft. As a result of the excellent service history of parts treated with Bonderite, Air Cooled Motors now are conducting experiments with this treatment for a variety of other Automotive Industries Automotive 26 Materials April 15, 1939 | ||