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Articles 1 - 3 of 3
Full-Text Articles in Mechanical Engineering
Anodisation Of Copper In Thiourea-And Formamidine Disulphide-Containing Acid Solution.: Part I. Identification Of Products And Reaction Pathway
A.S. Md Abdul Haseeb
The anodic behaviour of copper in aqueous 0.5 M sulphuric acid containing different amounts of dissolved thiourea or formamidine disulphide was investigated at 298 K, combining data from electrochemical polarisation, chemical analysis, UV–vis spectroscopy, XPS and EDAX analysis, and structural information on copper–thiourea complexes. The main reactions depend on the applied potential and initial thiourea concentration. In the potential range −0.30≤E≤0.075 V (versus SCE), the electro-oxidation of thiourea to formamidine disulphide, the formation of Cu(I)–thiourea soluble complexes, and Cu(I)–thiourea complex polymer-like films, are the most relevant processes. The formation of this film depends on certain critical thiourea/copper ion molar concentration …
Mössbauer Investigation On Electrodeposited Fe-C And Fe-Ni-C Alloys
Mössbauer Investigation On Electrodeposited Fe-C And Fe-Ni-C Alloys
A.S. Md Abdul Haseeb
Hard Fe-C based alloys, Fe-0.96 mass% C and Fe-15.4 mass% C having a microhardness of 810 and 750 HV, respectively, are electrodeposited from sulfate-based baths at 50°C. The Mössbauer spectra consist of high intensity sextet due to ferromagnetic Fe. The linewidth of the sextet is larger for alloys than for the pure Fe, indicating an increased effective field at different Fe sites in the alloys. Absence of any low intensity sextet, which is attributable to the Fe atoms close to the C atoms at the octahedral c-axis position, suggests that the electrodeposited alloys are in an advanced state of aging. …
Thermal Decomposition Study Of Electrodeposited Fe-C And Fe-Ni-C Alloys By Differential Scanning Calorimetry
A.S. Md Abdul Haseeb
Fe-0.96mass%C and Fe-15.4mass%Ni-0.70mass%C alloys with hardness of 810 and 750 HV respectively have been electrodeposited at 50°C from sulphate based baths containing a small amount of citric acid and L-ascorbic acid. Differential scanning calorimetry of the electrodeposited samples has been carried out in the temperature range of 293-725 K in argon atmosphere. Electrodeposited pure Fe is also investigated for comparison purposes. The DSC curves of both alloys contain two exothermic peaks: at about 411 K and 646 K for the Fe-C alloy, and 388 K and 639 K for the Fe-Ni-C alloy. These peaks are irreversible and do not appear …