"High rate." . . "Metallurgy and metallography." . . "Nottingham Univ. (GB). Department of Chemistry." . . "Measurement." . . "Resistance." . . "Thermal properties." . . . . "Temperature." . . "Sampling." . . "Thermal cycling tests." . . "Electrolytic cells." . . "Properties of Metals and Alloys." . . "Properties of metals and alloys." . "Time studies." . . "Rates." . . "Sources." . . "Electrical and Electronic Equipment." . . "Films." . . "Aluminum alloys." . . "Auger electron spectroscopy." . . "Aluminum." . . "Tanks(containers)" . . "Liquid rocket oxidizers." . . "Bottom." . . "Cutting." . . "Walls." . . "Corrosion." . . "Nitric acid." . . "Physical chemistry and theoretical chemistry." . . "Water." . . "Corrosion resistance." . . "Response." . . "Impedance." . . "Supplies." . . "Electrochemistry." . . "NOTTINGHAM UNIV (Great Britain) Department of CHEMISTRY." . . "Alloys." . . "Polarization." . . . "Corrosion of Aluminium Alloys by IRFNA"@en . . . . . . . . . "Concern has been expressed that IRFNA procured from different sources of supply, and hence containing different levels of water, HF, dissolved solids, etc., may produce varying rates of corrosion of storage tank alloys. In order to assess the effects of these variables upon the corrosion rate of aluminum alloy in IRFNA, four pairs of electrochemical cells of the bottom working electrode type, machined from 3L65 alloy and containing working electrodes cut from SN5144 oxidiser tank wall section, were constructed. The SN5144 oxidiser tank wall section used for the fabrication of these working electrodes was selected arbitrarily, i.e. without recognition of the left hand (LH) or right hand (RH) designation used previously, since no significant difference in corrosion behaviour was observed for such LH or RH samples in the previous studies. (JES)."@en . . . . . . . . . . . "Corrosion of Aluminium Alloys by IRFNA (Inhibited Red Fuming Nitric Acid)"@en . . . . . . . . . . . . . . . . . "Corrosion of aluminium alloys by IRFNA"@en . . "Originally it was proposed that twelve bottom-working electrode cells be pretreated. The four cells were mounted horizontally (in a temperature-controlled bath 25 C) to prevent any oil-like phases interfering with the surface of the working electrode. The results of experiments carried out of these cells are reported. The construction of an electrochemical cell containing four working electrodes, cut from the same region of an oxidiser tank, was postponed to allow for the remachining of cell bodies and lids for Parts A and E of the proposal. THe effect of oscillating-temperature cycles on the corrosion rate of aluminum in IRFNA has been investigated."@en . . . . . . "Corrosion rate and related data have been obtained for 2014(3L65) aluminium alloy, either untreated or subjected to certain surface pre- treatments, before contact with IRFNA, gelled IRFNA (IRFNA + SiO2 + LiNO3) and these media containing added P2O5. The temperature dependence of the corrosion reaction in gelled IRFNA has also been studied electrochemically, using a 20 C temperature cycle. Similar temperature cycling data involving IRFNA were presented in the First Interim Report. The lowest corrosion rates determined by weight change occurred when the allow had been pre-treated with gaseous C1F3 before immersion in gelled IRFNA or gelled IRFNA containing 0.5 wt.% P2O5. The latter medium gave a low corrosion rate even in the absence of the C1F3 pre- treatment. Pre-treatment with a gaseous HF/F2 mixture or by electropolishing and anodising, before immersion in gelled IRFNA, conferred no advantage as judged electrochemically but these pre-treatments were not evaluated by weight change."@en . . . . . . . . . . . . . . . . "It has been demonstrated electrochemically (by corrosion potential-time, polarization resistance and Tafel behavior) that the presence of a high concentration of Cu(2+) ions (580 wpm) in IRFNA (Inhibited Red fuming Nitric Acid) does not lead to an increase in the corrosion rate of aluminum alloy in this liquid oxidizer, or to any significant change in the corrosion potential of the system. The effect of the addition of water, to give an appreciably over-propellant specification level (6.75 wt.%H2O), on the corrosion rate of aluminum alloy in IRFNA containing initially 2.79 wt.%H2O) has been investigated by corrosion potential-time polarization resistance and a.c. impedance measurements. The results indicate an order of magnitude increase in corrosion rate and an apparent increase in film thickness, following the addition of water. The effects of variations in IRFNA composition on the corrosion rate of aluminum alloy in IRFNA using four pairs of electrochemical cells, each pair containing IRFNA obtained from a different source, have also been studied. The electrochemical results indicate that the alloy corrodes at a similar rate in IRFNA obtained from three different sources. Auger electron spectroscopy has been used to monitor the effects of certain surface pre-treatments and exposure to IRFNA of samples of aluminum alloy."@en . . . . "Concentration(composition)" . . "Electrodes." . . "Addition." . . "Storage tanks." . . "Electric batteries." . . "Doping." . . "Thickness." . . "Cells." . .