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).
Tests of a corrosion inhibitor submitted by Messrs. Newton, Chambers & Co., Ltd.
| Identifier | ExFiles\Box 94\3\ scan0285 | |
| Date | 24th July 1937 | |
| NATIONAL PHYSICAL LABORATORY (METALLURGY DEPARTMENT) REPORT Abstract of (results obtained in) Tests of a Corrosion Inhibitor submitted by Messrs. Newton, Chambers & Co., Ltd., Grand Buildings, Trafalgar Square, London, W.C.2. Authority for Test : Letter dated 20 : 1 : 37. Two cast-iron pots, A and B, 21.5 cm. high, 16.5 cm. diameter, were filled to within 1 cm. of the brim, A with tap-water, B with tap-water containing 1/80 of its volume of the inhibitor. In each pot, weighed metal rods, about 18 cm. x 1 cm. diameter stood on end, spaced by a glass cage to leave room for a nickel paddle 10 cm. wide. By day, but not at night, the pots were heated to 80° ± 5°C. and the paddle rotated at 5 r.p.m. Covers of sheet rubber minimised evaporation. Water was added as required to maintain the level. TABLE OF RESULTS Column Headers: Mild steel drawn rod, Cast iron turned, Copper drawn rod, Brass drawn rod, Solder over brass, Y-alloy wrought, heat-treated, turned, Cast iron pot, Liquid in pot. First inspection after 8 days of immersion—48 hours' heating. Row A: blackened, blackened, trace of rusty scale, trace of rusty scale, trace of rusty scale, 5-6 small efflorescences, slight rusting, much rust settled, 400 ml. evaporated Row B: bright with oily film, bright with oily film, bright with oily film, bright with oily film, bright with oily film, bright with oily film, oily film, 50 ml. evaporated Second inspection after 18 days of immersion—100 hours' heating. Row A: black with signs of pitting, black, some rusty scale, some rusty scale, some rusty scale, dull, with rusty scale, rusting, 950 ml. evaporated Row B: bright, fairly bright with black oily streak, nearly free from scale, no scale, no scale, bright with a few white spots, oily film, 300 ml. evaporated Third inspection after 43 days of immersion—198 hours' heating. Row A: black with cap and streak of rust, dull black with large rusty patches, thin film of rusty scale, thin film of rusty scale, thin film of rusty scale, thin film of rusty scale, 4 white nodules, rusty, 2 l. evaporated, thick black sediment Row B: slightly dulled, oily, bright with 3 small patches of rust, oily, bright and oily, bright and oily, bright and oily, oily, white nodules very dense near bottom end, oily, 750 ml. evaporated, very slight sediment Final inspection after scrubbing Row A: much sooty oxide removed, one pitted patch, much sooty oxide removed: no pits, dull, slight scale remained, dull, grey with a few white spots, rust near top, ignited sediment 5.23 gm. Row B: slightly dulled, 3 black patches, fairly bright, fairly bright, bright, pits and protuberances in lower half, very little rust, ignited sediment 0.46 gm. Change in weight mgm/cm² Row A: 9.49 loss, 5.61 loss, 0.03 loss, 0.24 gain, 0.05 loss, 0.26 loss, --, -- Row B: 0.29 loss, 1.21 loss, 0.29 loss, 0.42 loss, 0.08 loss, 1.64 loss, --, -- Strips of black rubber hose-pipe suspended in the pots after the second inspection were little affected in either A or B, but in B the rubber had become slightly tacky. On the nickel paddle in A numerous minute nodules formed: that in B showed only a few slight spots. Date: 24th July, 1937. Reference GB|JE/2275. F.{Mr Friese} E.{Mr Elliott - Chief Engineer} SMITH, Director. S. L. ARCHBUTT, For Superintendent, Metallurgy Department. | ||