摘要:

AbstractThe effect of applied tensile stress on the corrosion of commercial‐purity aluminium—magnesium alloys has been determined by subjecting the alloys, in the form of 16‐gauge wire, to intermittent immersion in 3% sodium chloride solution buffered at pH 6.Overstraining 10%, followed by ageing at 125° for 24 hours, renders aluminium‐7%‐magnesium alloy susceptible to stress‐corrosion with applied stresses as low as 2% of the U.T.S. (ultimate tensile strength), and aluminium‐5%‐magnesium alloy with stresses greater than 24% of the U.T.S. Stresses smaller than the threshold stress have little effect on the rate of attack. Under comparable stresses (per cent. of U.T.S.), the time‐to‐failure of the 5%‐magnesium alloy is considerably greater than that of the 7%‐magnesium alloy. A high proportion of the loss of strength due to stress‐corrosion occurs just before failure.Additional evidence is provided for the existence of points specially susceptible to stress‐corrosion which are distributed over

ISSN:0021-8871    

DOI:10.1002/jctb.5010040101

出版商:John Wiley&Sons, Ltd    

年代:1954

数据来源: WILEY

摘要:

AbstractThe presentation of data obtained from stress‐corrosion experiments, in which the effect of stress on the time‐to‐failure is determined, is discussed.Methods are suggested by which the susceptibility to stress‐corrosion of materials may be expressed on a comparative basis. The results given in Part I on the stress‐corrosion of aluminium—7%‐magnesium and aluminium‐5%‐magnesium alloys are used to illus

ISSN:0021-8871    

DOI:10.1002/jctb.5010040102

出版商:John Wiley&Sons, Ltd    

年代:1954

数据来源: WILEY

摘要:

AbstractThe observation of Farrer&Wormwell1that steel is attacked rapidly by aqueous dispersions of sulphur has been confirmed. It has been shown, however, that the corrosion is decreased considerably when the pH of the solution is raised to a value of 9 or lowered to a value of 4. Much less corrosive effects were noted when dispersions of commercial sulphur cements were used in place of elementary sulphur.

ISSN:0021-8871    

DOI:10.1002/jctb.5010040103

出版商:John Wiley&Sons, Ltd    

年代:1954

数据来源: WILEY

摘要:

AbstractThe effect of‐surface‐active agents on the rate of solution of sulphur in sodium and ammonium sulphite slurries has been studied. Cationic surface‐active agents greatly increase the rate of solution. Anionic agents produce some acceleration in the bulk reaction by improving the dispersal of the powder, but retard the specific reaction rate per unit surface area of the sulphur. The Catalytic effectiveness of a homologous series ofn‐alkylpyridinium bromides increases up to the dodecyl member, then decreases with further increase in chain length. The catalytic behaviour of the cationic accelerators is thought to be due partly to a surface‐charge effect and partly to a local generation of pol

ISSN:0021-8871    

DOI:10.1002/jctb.5010040104

出版商:John Wiley&Sons, Ltd    

年代:1954

数据来源: WILEY

ISSN:0021-8871    

DOI:10.1002/jctb.5010040105

出版商:John Wiley&Sons, Ltd    

年代:1954

数据来源: WILEY

摘要:

AbstractAn extension of the work of James and Martin on the separation of volatile fatty acids and bases by gas—liquid partition chromatography is described. This technique has now been applied to the analysis of most types of volatile organic compounds on a milligram scale; mixtures of hydrocarbons, alcohols, ethers, esters, aldehydes and ketones have been separated on a column of kieselguhr impregnated with di‐(3: 5: 5‐trimethylhexyl) phthalate, and the components determined by a thermal‐conductivity

ISSN:0021-8871    

DOI:10.1002/jctb.5010040106

出版商:John Wiley&Sons, Ltd    

年代:1954

数据来源: WILEY

摘要:

AbstractFluid ‘hydroforming’ is a powdered catalyst operation that owes its success to continued research and development on naphtha‐upgrading. Its predecessor, fixed‐bed ‘hydroforming’, was employed commercially to make aromatics and aviation gasoline during World War II. The principal reaction occurring is dehydrogenation under pressure in the presence of product gas rich in hydrogen. Like fluid catalytic cracking, it is a regenerative process and can therefore be operated at steady‐state conditions. Among its advantages are superior product distribution, reduced investment and lower operating cost. Fluid ‘hydroforming’ is believed to represent the first successful commercial exploitation of the powdered catalyst technique in a flow system under sub

ISSN:0021-8871    

DOI:10.1002/jctb.5010040107

出版商:John Wiley&Sons, Ltd    

年代:1954

数据来源: WILEY

摘要:

AbstractTrouton's rule is modified to allow for the fact that the entropy of vaporization is generally a function of the Guldberg ratio and the parachor‐critical volume ratio. The medification has the advantage that it is applicable to non‐associated substances of low boiling‐point, and furnishes a rational basis for their classification into normal and abnormal liquids. Moreover, a high value of the medified ratio is diagnostic of association in the liquid

ISSN:0021-8871    

DOI:10.1002/jctb.5010040108

出版商:John Wiley&Sons, Ltd    

年代:1954

数据来源: WILEY

摘要:

AbstractThe ‘hole’ theory of solubility which was applied to explain physical toxicity in Parts I, II and III has been used for the calculation of partition coefficients between organic solvents and water, and of solubilities in water. Some relationships previously observed between solubilities and toxicities have been explai

ISSN:0021-8871    

DOI:10.1002/jctb.5010040109

出版商:John Wiley&Sons, Ltd    

年代:1954

数据来源: WILEY

摘要:

AbstractThe determination of halogens in chloro‐ and bromo‐platinates, which react incompletely with silver nitrate, is shown to be rendered simple and accurate by the use of preliminary reduction with hydrazine hydrate, followed by precipitation with silver nitrate and titration with thiocyanate (Volha

ISSN:0021-8871    

DOI:10.1002/jctb.5010040110

出版商:John Wiley&Sons, Ltd    

年代:1954

数据来源: WILEY