70 



G. J. BURROWS AND C. E. FAWSITT. 



When it is remembered that a steel of "9°f carbon has the 

 eutectic composition of "perlite," it can readily be believed 

 that a steel containing perlite only might corrode less than 

 a ferrite-perlite steel, [i.e. 0-0 # 8°/° carbon]. We think, 

 however, that it will scarcely be possible to claim superi- 

 ority for such a high carbon steel until further experiments 

 have been made. 



(3) Influence of the Magnetic Condition of Steel on its 

 Corrosion.— It has not to our knowledge been suggested 

 that magnetisation affects corrodibility, but to test this 

 we performed some experiments on the steel already 

 described in paragraph (1). The results showed in Table III 

 indicate that magnetisation has no noticeable effect on the 



corrosion. 



Table III. 



Corrosion of steel in unstirred distilled water. 



Condition of Sample. 



Weight at start. 



Loss of Weight after 21 

 days. 



Magnetised 



Unmagnetised 



,, ... 



65060 grams 

 64-746 „ 

 63-903 „ 

 63-557 „ 



0-236 grams 

 0-221 „ 

 0-226 „ 

 0-2111 ., 



It is known that bore casings are often found to be 

 magnetised, so it is well that we should have proved that 

 this has no effect on the corrosion. 



(4) Effect of additions to water on the corrosion of steel 

 in water.— The effect of adding small quantities of soluble 

 matter to water is sometimes to increase and sometimes 

 to decrease the corrosive power of water on steel. The 

 general effect of adding an acid is to increase, and of an 

 alkali to decrease corrosion. 



The effect of adding salts has only lately begun to be 

 studied in a systematic manner by Messrs. Hehn and Bauer. 1 



1 International Society for Testing Materials, Eepott of Copenhagen 

 Congress, 1909. 



