The author first discusses the factors to be considered before deciding on the use of an inhibitor. He then deals in turn with the most important inhibitors, namely sodium…
Abstract
The author first discusses the factors to be considered before deciding on the use of an inhibitor. He then deals in turn with the most important inhibitors, namely sodium chromate, sodium nitrite, sodium benzoate and sodium salts of organic acids, and duplex inhibitors. He concludes with some notes on water treatment and the application of phosphates and silicates. In his first article (August), Dr. Shreir outlined the principles of inhibition.
S. BAKER, E. CARR, E.H. LAITHWAITE, E.W. SKERREY, PHILIP E. HALSTEAD, I.C. HUDSON, F. WORMWELL, F.E. JONES, R.W. BAILEY and H.G. RIDGE
The following are shortened versions of papers read at the recent symposium on the corrosion of metals in buildings. The symposium was arranged by the Corrosion Group of the…
Abstract
The following are shortened versions of papers read at the recent symposium on the corrosion of metals in buildings. The symposium was arranged by the Corrosion Group of the Society of Chemical Industry and was held at the Institution of Civil Engineers.
The above heading is the title of a book by J. H. Morgan just published by Leonard Hill Ltd. The following is a review of the work, by DR. F. WORMWELL, which indicates its…
Abstract
The above heading is the title of a book by J. H. Morgan just published by Leonard Hill Ltd. The following is a review of the work, by DR. F. WORMWELL, which indicates its importance and value to those concerned with the use of cathodic protection.
The corrosion of metals can be reduced or prevented by influencing the electrode processes of electrochemical corrosion cells with suitable chemical additions to the corrosive…
Abstract
The corrosion of metals can be reduced or prevented by influencing the electrode processes of electrochemical corrosion cells with suitable chemical additions to the corrosive electrolyte. It is the purpose of these articles to consider the mechanism of inhibition, and the applications and limitations of typical inhibitors. This first article is devoted to a consideration of the principles of inhibition in aqueous neutral solutions.
Growing realisation of the costs and menaces of corrosion over the past two decades or more has slowly led to an increase in its study. Corrosion due to aqueous media and its…
Abstract
Growing realisation of the costs and menaces of corrosion over the past two decades or more has slowly led to an increase in its study. Corrosion due to aqueous media and its prevention by water treatment has only relatively recently become a subject of study. In this article the author chiefly discusses corrosion and its prevention in boilers and their accessories.
The terms ‘bacterial corrosion’ and ‘microbiological corrosion’ are used synonymously to describe corrosion that is caused by, or is stimulated by, bacterial action. The…
Abstract
The terms ‘bacterial corrosion’ and ‘microbiological corrosion’ are used synonymously to describe corrosion that is caused by, or is stimulated by, bacterial action. The fundamental nature of the corrosion is the same as in the more common process involving inorganic agents. It is, therefore, necessary to understand the basic processes of corrosion before the true role of bacteria can be appreciated.
The Department of Scientific and Industrial Research has been responsible for investigations on the corrosion of metals since 1924, when a Corrosion Research Committee was set up…
Abstract
The Department of Scientific and Industrial Research has been responsible for investigations on the corrosion of metals since 1924, when a Corrosion Research Committee was set up with the late Dr. G. D. Bengough as its first senior investigator. In 1927 research on atmospheric corrosion directed by Dr. W. H. J. Vernon was taken over by D.S.I.R. and in 1928 the Group was transferred from the Royal School of Mines in London to the then Chemical Research Laboratory at Teddington. This establishment had been inaugurated several years previously as a separate D.S.I.R. station situated in the same grounds as the National Physical Laboratory. Quite recently it has achieved the status of National Chemical Laboratory; but the ‘C.R.L.’ (now the ‘N.C.L.’) has always derived great benefit from its proximity to its much larger and older sister station.
It does not need much imagination to picture fairly vividly the immense problems occurring in industry due to the ravages of corrosion. Water is a universal service, but by reason…
Abstract
It does not need much imagination to picture fairly vividly the immense problems occurring in industry due to the ravages of corrosion. Water is a universal service, but by reason of the impurities • it contains in its natural state it may rapidly corrode the heating system or the cooling system or the process system in which it is employed. The photographs in the following article show examples of what may happen.
CORROSION may be costing U.S. petroleum refiners as much as $250 million p.a., according to an estimate based on a study being made by an American Petroleum Institute…
Abstract
CORROSION may be costing U.S. petroleum refiners as much as $250 million p.a., according to an estimate based on a study being made by an American Petroleum Institute sub‐committee on corrosion. One of the objectives of this study is to work out more reasonable methods for determining losses due to corrosion.
M.N. Desai, S.S. Rana and M.H. Gandhi
Zinc is one of the most important nonferrous metals and finds extensive use in metallic coatings. It is resistant to atmospheric attack and corrodes rapidly only in highly…
Abstract
Zinc is one of the most important nonferrous metals and finds extensive use in metallic coatings. It is resistant to atmospheric attack and corrodes rapidly only in highly polluted air. It is resistant to most fresh waters but its resistance to sea water and to very soft water is lower. In many aerated hot waters, reversal of polarity between zinc and iron occurs at temperatures of 60°C or above. The corrosion products of zinc are readily soluble both in alkalis and acids and protect the metal surface only in neutral media. In neutral solutions, zinc is corroded mainly by oxygen depolarisation. The dissolution rate of zinc in acids is greatly affected by the over‐potential of hydrogen evolution at cathodic inclusions.