Chemical aluminium alloys

Chemical milling - Aluminium alloys Photochemical blanking - Steel Photochemical blanking - Copper... 

Kirk-Othmer Encyclopedia cf Chemical Technology, 4th edn., Vol. 2, Aluminium and aluminium alloys, pp. 184-251 Aluminium compounds, pp. 252-345. Interscience, New York, 1992. 

Processing and storage equipment for many chemicals, including acetaldehyde, formaldehyde, nylon salt, methyl methacrylate, carbon tetrachloride, glycerol, triacetin, proprionic acid, acetic acid and acetic anhydride, is manufactured from aluminium alloys, primarily because of their excellent corrosion resistance. 

Reininger, H., Further Developments in Metal Spraying Technique , Metalloberfldche, 15, 52, 88, 118, 148 (1961). (Translation available as TM460, Aluminium Federation, Brimingham) Scott, D. J., Aluminium Sprayed Coatings Their Use for the Protection of Aluminium Alloys and Steel , Trans. Inst. Met. Fin., 49 No. 3, 111-122 and 49 No. 4, 173-175 (1971) Sprowl, J. D., Aluminized Steel-A Description, Report of the Department of Metallurgical Research, Kaiser Aluminium and Chemical Corporation, April (1958)... 

Fig. 4. The nominal breaking stress (Amsier testing machine) of aluminium alloy/epoxy single lap joints as a function of the hydroxyl content of the epoxy raised to the two-thirds power51 (Reprinted from Ref. 51, p.307, by courtesy of Society of Chemical Industry)...

Samples of the aluminium alloys obtained were analysed chemically to determine their transition-metal contents. Use was usually made of photometric methods. The results were then compared with those found from mass loss measurements. 

Calculated from mass loss measurements. b Found by chemical analysis of aluminium alloys after the runs. 

Substrates. Two commercial aluminium alloys (see Table 1), received as hot-rolled sheets (from ALCAN), were the main body-panel materials used in the current work. The thickness of the sheets varied from 1 to 3 mm for the 5754-0 alloy and from 1 to 2 mm for the 6111-T6 alloy. For the tapered double-cantilever beam (TDCB) tests, where the substrates should remain within the elastic region, a high yield strength alloy, 2014, was used throughout. The specimens were prepared and pre-treated prior to bonding using the procedures proposed by Blackman et. al. [2], The chemical compositions of the alloys employed are given in Table 1. 

The increasing use of lightweight dilute magnesium-aluminium alloys in the automotive industry has led to Mg NMR studies of some of these materials. The Mg NMR spectrum of Mg-6 % A1 is very similar to that of pure Mg apart from a small variation in the chemical shift and a smearing out of the satellite transitions resulting from a distribution of interactions as the A1 substitutes into the framework (Bastow and... 

Canister bodies are usually made from an aluminium alloy or chemically hard plastic such as... 

In order to have a definite chemical system to study, we have chosen a reactor which is probably not very realistic as a power producer, but one which has the advantage that we know both the design details of the fuel element and the cost and design data for the chemical processing plant in which this fuel element is presently handled. We have adopted an MTR type fuel element which is composed of enriched uranium aluminium alloy, but we have assumed that the is replaced by Since any thermal reactor power economy... 

As a ceramic, keronite is resistant to most chemicals and therefore performs extremely well in most corrosive environments. Because of the hardness of the layer, treated aluminium alloys can now be used as direct replacements for steel with corresponding weight savings. 

Susceptibility to corrosion also inoeases as the feature size deaeases. By using these techniques concurrently, the anthors were able to characterize the degree to which fluorescein dye could be used to detect corrosion of the nanoporous aluminium alloy. Second-phase particles, 4-5 pm in diameter, were seen to contribute to the local corrosion (see Figure 3.7). An advantage of the developed technique is that topography and chemical concurrent mapping can be achieved to provide an understanding of the corrosion processes and evaluation of fluorescent dyes that can be used to evaluate them. 

The available processes can be broadly divided into four categories mechanical, chemical, electrochemical and others. All of these processes are designed to modify the aluminium alloy to provide a high energy, wettable surface that is relatively free from contamination. As mentioned, the most successful also provide additional surface roughness and enhanced passivation. 

For aluminium, the choice of pre-treatment will depend on the aluminium (or the aluminium alloy) itself and the corrosion resistance required. Chromium-containing pretreatments have proved to be the most effective, but concern in recent years over the toxicity associated with the chemicals used is now driving forward the development of... 

Two racks (racks 2 and 3) containing aluminium and stainless steel coupons were received during the second RCM in S3o Paulo. These coupons consisted of three pairs of large discs of the aluminium alloys 1100,6061 and 6063, and two pairs of small discs of the aluminium alloys 6061 and 6063, in galvanic contact with 316 type stainless steel. The large discs were used to form the crevice couples, while the smaller discs were used to form both crevice and galvanic couples. The chemical compositions of the coupons were assumed to... 

Some environmental conditions may cause deterioration of structure or equipment through chemical reactions other than corrosion, e.g. reaction of the structure or equipment with ozone or NOj. Use of chemicals may cause damage to equipment. Special care should be taken when irradiating capsules containing materials such as copper or mercury which may cause strong corrosion in aluminium alloys. 

Although an Ni/Mo alloy melt does not wet a-BN, slow interface reactions are observed [20]. On the other hand, mutual wettability of materials sometimes is a first indication for chemical affinity. Thus, the wettability of a-BN by aluminium and aluminium alloys increased with increasing temperature a content of rare earth metals in the aluminium melt leads to a decrease of the wettability [21]. Reaction-bonded a-BN is completely eroded by liquid steel at 1650°C in an Ar atmosphere [22]. The contact angles formed on graphite substrates by molten lead di-chloride/alkali metal chloride mixtures do not change when the Ar atmosphere is replaced by CI2. However, when air is introduced complete wetting is observed after about five minutes. This is not the case with a boron nitride substrate [23]. 

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