Anti-Corrosion Methods and Materials

1954 Anti-Corrosion Methods and Materials

doi: 10.1108/eb018958

CORROSION HAZARDS IN SURGERY. AN elegant experiment with radioactive isotopes has revealed the cause of corrosion of metal plates used in surgery for repairing broken bones. It had been thought that the reason for this corrosion was the transfer of traces of foreign metal from the screwdriver to the screws used to fix the plates. This has been confirmed by scientists of the Royal Infirmary, Bradford, and the Department of Physical Chemistry, Cambridge, who incorporated radiochromium in a surgical screwdriver and measured the amount of radioactivity transferred to the screws. The two metals in contact may set up an electric cell which can cause the serious condition which prevents healing known as electrolytic inflammation. The experiment was described in a paper presented at the 2nd RadioIsotope Conference held in Oxford recently.

Kington, C.N.

1954 Anti-Corrosion Methods and Materials

doi: 10.1108/eb018959

The term edge cutlery as used in this article refers to spring knives such as pocket knives which include a flat spring and moveable blades, knives without springs such as table knives, kitchen, butcher, carving and trade blades, etc., scissors and cutthroat razors. The British cutlery trade has a normal turnover of the order of several million pounds per year in these and allied edge products, and approximately half of this is accounted for by exports, so that the trade has to cater for varying climatic and use conditions in a large number of countries all over the world. Corrosive conditions can occur in ordinary use and also during transport and storage, and whilst serious corrosion is rare some examples are sufficiently interesting to warrant examination. Today, corrosion problems in British edge cutlery are almost invariably traceable to extraordinary conditions encountered in transit or in use, and over which the manufacturer often has little or no control. The lessons to be learned from investigation of such cases as do occur nearly always require application by the user, and less frequently, by those responsible for transport and storage.

Godfrey Waite, W.

1954 Anti-Corrosion Methods and Materials

doi: 10.1108/eb018960

The cathodic protection of ships against corrosion has a long history, for it was first applied in 1824 by Sir Humphry Davy for the protection of the copper sheathed hulls of British warships. Here the author describes the modern art of cathodic protection which can be used at every stage of a ship's life from the fittingout period onwards. Besides its main use for the protection of hulls, the method is applicable to propellors, stern gear, cargo compartments, etc., and it can result in very considerable savings in repair costs. The author also discusses the cathodic protection of other marine structures such as floating docks, mooring buoys, etc.

Howells, G.

1954 Anti-Corrosion Methods and Materials

doi: 10.1108/eb018961

There are a number of reasons for applying metallic or nonmetallic coatings to metal articles, the most common being to prevent the atmosphere coming into contact with the base metal and setting up corrosion. Others are a to provide a means of sacrificial corrosion b to enable the electrochemical potentials of two metals in contact to be kept within certain limits c to build up dimensions. In all these instances measurement of the thickness of the coating to a fair accuracy is necessaryif only to ensure that sufficient material has been applied to provide protection. One of the first commercial processes for coating one metal on another was the hottinning of steel sheets and is still very much used. It is not surprising, therefore, that many of the methods of measuring coating thickness were first developed with the tinplate industry in mind. Tin is now applied in increasing quantities by electroplating processes and many other metals are used to form a protective coating on metallic articles. Measurements are usually affected to some extent by the quality i.e. porosity, crystal structure, amount of alloying, etc. of the coating and this must be taken into account when the final accuracy to be expected is considered.

Haarmann, R.; Cazzaniga, L.; Sousk, R.; Celli, A.

1954 Anti-Corrosion Methods and Materials

doi: 10.1108/eb018962

Here are summaries of more papers given at the International Conference on Hot Dip Galvanising which met at Oxford in July under the auspices of the Zinc Development Association and which was attended by about 200 experts from Britain, the Continent, and America. The first report on the Conference appeared in our August issue.

Stanners, J.F.

1954 Anti-Corrosion Methods and Materials

doi: 10.1108/eb018963

In this second and concluding part of his article, Mr. Stanners discusses the choice of paints, paint formulation, the paint system, and, finally, when and how to paint. The first part of the article Preparing to Paint appeared in our August issue.

Leslie, R.

1954 Anti-Corrosion Methods and Materials

doi: 10.1108/eb018964

Temporary corrosion preventives based on petroleum are applied to a great variety of products ranging from ball bearings to sheet steel to give protection during manufacture, transport or storage. In this article the author describes the main types of preventives, their selection for particular purposes, methods of application, the types of and mode of action of inhibitors added to the preventives and, finally, methods of testing.

1954 Anti-Corrosion Methods and Materials

doi: 10.1108/eb018965

IT is often mistakenly thought that the fight against corrosion is exclusively, or largely, a problem of maintenance. That this is not so is a point strongly emphasised by a Belgian expert, R. de Smet, who, in the May 1954 issue of Industrie Chimique Belge, surveys corrosion from a plant designer's viewpoint.

McDowell, J.R.; Uhlig, H.H.; Tierney, W.D.; McClellan, A.; Horger, Oscar J.

1954 Anti-Corrosion Methods and Materials

doi: 10.1108/eb018966

In our August issue we published summaries of two papers given at the Symposium on Fretting Corrosion organised by the American Society for Testing Materials. Three more papers are summarised below. They are concerned with testing equipment for evaluating fretting corrosion, the influence of fretting corrosion on the fatigue strength of fitted members, and the fretting corrosion tendencies of combinations of materials.

1954 Anti-Corrosion Methods and Materials

doi: 10.1108/eb018967

Cathodic corrosion protection. Cathodic corrosion is defined as the corrosion occurring of a metal which, in an electrolytic cell, forms the cathode. This type of corrosion is discussed in detail and a number of valuable data about loss of material due to corrosion, current densities, etc., are given for a variety of conditions.W. Thury, Werkstoffe & Korrosion, 1954, 5 3, 8487.