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Background An increasing number of requests from the engineering industry are being received by the author's company to advise on procedures for modern anti‐corrosive treatment and protection of valves, pumps, compressors, heat exchangers, filters etc.

The problem of corrosion and its influence on spring performance is possibly even more vital than any other component in the field of engineering. This may seem to be an overstatement until the peculiar position of springs in engineering is fully understood. A spring is a device for storing and releasing energy, either at a definite time cycle, of which motor‐car or aero valve springs are a good example, or in continuous but out‐of‐phase timing, as typified for instance in the oscillating of the coil suspension of motor‐cars. Again, this unique engineering component may be called on to operate only at intervals, such springs including those found in electric light switches, return mechanisms and the like. Thus coil springs can be quite fairly said to be some of the most ubiquitous components in industry.

Geigy Co. Ltd. Stand 75. Diversified application of benzotriazole as a corrosion inhibitor specifically for copper and its alloys is the main theme of Geigy's stand.

In the manufacture of ammonium sulphate, whether by using evaporators or saturators, the erosive effect of crystals present in solution, the low sulphuric acid concentrations usually present, and the relatively high temperatures of operation give rise to serious corrosion problems which begin at the drawing board stage of design and continue through all stages of manufacture. These corrosion problems are discussed in detail in this article and advice is given on materials of construction, including stainless steels, nickel alloys, rubber‐lined mild steel, lead, silicon irons, aluminium and a number of plastics.

For economic reasons it is imperative that shut‐downs at oil refineries should be kept to a minimum. Corrosion is a major factor contributing to a shut‐down; therefore its control and elimination is of vital importance to the petroleum industry. In Part 1 of this series (May issue) the authors discussed the ways in which corrosion attacks various parts of a refinery, and described some of the equipment and metals used to combat these attacks. In Part 2 methods for treating corroded parts are described.

From November 29 to December 2 the Empire Hall at Olympia, London, will be given over to what will probably be the world's largest display of products, processes and services for use in the prevention or limitation of corrosion. Over 120 stands will be shared by 94 exhibitors, each contributing in some way or in many ways to this cause. The extensive preview in the following pages is divided into sections. However, the grouping is general and reflects only one aspect of a company's activities. Therefore a complete examination of items is recommended.

The end of this month will see Britain's biggest display of products and processes designed to prevent the onset of corrosion in all its forms. At the Royal Horticultural Society's New Hall, in Westminster, there will be over a hundred stands on view to visitors to the Exhibition which will run from April 27 to 30 inclusive. Here is C.T.'s exclusive preview. Stand descriptions are grouped under various headings, but the fact that a firm's exhibits are described under one heading does not necessarily mean that its interests are confined solely to that group of products. The grouping of exhibitors in this preview is merely intended to facilitate visitors who are interested in particular aspects of corrosion prevention.

Tantalum has a resistance to aqueous corrosion that may be compared closely with that of glass. The principal use of the metal is in the construction of chemical plant where its excellent corrosion‐resistant properties have assured a place for it in special applications, particularly where corrosion resistance needs to be combined with a high degree of heat transfer. This sphere of application is expanding rapidly.

In 1950, only a handful of British manufacturers had ever considered the possibility of using titanium as a structural metal. They were all in the aircraft industry, where the search for light, strong materials was reaching a fresh peak of urgency. Ten years later, titanium is almost a commonplace in aircraft and chemical engineering; is rapidly establishing itself in the dyeing, bleaching, paper‐making and petroleum industries; and is stimulating designers of such diverse equipment as surgical implants and nuclear reactor components.