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CORROSION MYSTERY CORROSION WITH CADMIUM PLATING CT CASE HISTORY ONE of the more interesting cor into the chassis. At areas where it rosion problems investigated during was physically impossible for the the current year occurred at a finger to penetrate, there was no manufactory of electronic equip corrosion, and the limit of such areas ment. Located in the north of Eng was quite frequently delineated by a land, this company specialised in the corroded zone. production of audio frequency ampli fiers of a very high quality, and the Body fluid variation management were disturbed, over a Body fluids conform to quite narrow period of five years, by sporadic com ranges of composition, so much so, in plaints of corrosion on a small pro fact, that minor variations can often portion of their chassis units. It took indicate a serious pathological con the form of dark grey or black patches, dition. Perspiration normally tends to up to about 2 sq.in. in area, which did be corrosive, being mildly acidic and not develop until the units had been saline in character. built into specially made wooden From this point, the hypotheses In the assembly of these amplifiers, cabinets at a sub-contractor's premises. advanced grew more ingenious until, female labour was employed and, An interval of several months could the phenomenon being adjudged super during menstruation, there is not only pass between manufacture and instal natural in origin, no loss in dignity a much greater tendency for the hands lation, and units inspected after stor was involved in co-opting professional to perspire but there is also a change age and immediately prior to dispatch assistance. in the nature and composition of the to the sub-contractor were sub The localised nature and random perspiration. Certain individuals, at sequently returned in the condition such times, can become potent sources distribution of corroded areas were described. of corrosion, and during the war years strongly suggestive of some form of dangers of this type were eliminated The company concerned had no contamination. Inspection of the by the removal of operatives during laboratory, no metallurgist and no plating facilities and the storage con this active period to work of a different chemist; in short, there was no scape ditions—these, in particular, were ideal, being warm and dry—offered character. When the war passed, and goat at all. The small plating shop, no possible explanation. Qualitative long-term storage was no longer a which deposited zinc, cadmium or requirement of the product, the rather examination of corrosion product yiel nickel as required, had in some way tiresome organisational procedures penetrated into the responsibility orbit ded little, only the smallest traces of were gratefully forgotten. There are, of the chief designer and was kept chloride being detectable, and the of course, many references to this under remote technical control by the cause of th e contamination was obscure until the chassis was examined by characteristic of cadmium in the plating materials supply house. artificial light. It was then possible to literature: U. R. Evans, in Metallic The first reaction was, of course, to Corrosion, Passivity, and Protection, is discern a fingerprint in one of the blame the plating, but the supply explicit on this point—'Cadmium corroded areas, the corrosion product house extricated themselves from this plating . . . being somewhat sensitive reproduced, in considerable detail, the dangerous position with considerable to perspiration, should not be applied epidermal convolutions. This was adroitness and under the cover of much less apparent in normal day to articles which have to be handled'. heavy technical artillery—an open light, but on continued examination verdict was returned at each of the An interesting feature of this case it was found that the greater majority inquests. The cabinet makers were was the dormant nature of the pheno of corroded areas contained at least then investigated, it being thought menon. A chassis could be assembled, identifiable portions of fingerprints. possible that the effect was initiated inspected, put into storage for a con Fig. 1 is a photograph of one of the by contact with hardwoods, some of siderable period, withdrawn, again more complete specimens. which are known, in the presence of inspected and passed, issued to the moisture, to display malevolent ten sub-contractor, and corrode within a From this point the situation could dencies to adjacent metallic materials. few days. The residues were clearly be readily resolved. The chassis itself This promising theory was promptly insufficient to initiate corrosion alone was cadmium plated. Zinc, copper repudiated by the cabinet makers, who and nickel surfaces were completely and were inactive under the warm, were able to demonstrate that corrosion free from corrosion. The most heavily dry storage conditions. During instal occurred least at areas which should lation into the cabinets, conditions corroded areas on the cadmium surface have been affected most had this were less ideal and there was no longer were precisely those most handled mechanism been operative. a suspension of the corrosive processes. during the assembly of components CORROSION TECHNOLOGY October 1962
Anti-Corrosion Methods and Materials – Emerald Publishing
Published: Oct 1, 1962
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