BACKGROUND AND OBJECTIVES: The reduction of fresh water deficit and water-related morbidity is the most important problem of the state’, s national security. The effective treatment of natural water in industrialized areas from natural and anthropogenic pollutants is the main ecological task. Coagulation is one of the effective methods used to treat water chemically to purify it. Aluminum polyoxychlorides have gained popularity because of their advantages over coagulants—, aluminum and iron sulfates. No production of aluminum polyoxychloride occurs in Kazakhstan despite the need for coagulants (the minimum need is assessed at about 11 thousand tons). The work is aimed at theoretical justification and experimental proof of a principally new approach to the development of aluminum polyoxychloride production technology based on activated aluminum alloys containing metal activators, such as gallium, indium, and tin from 0. 5 to 5 percent weight. In addition, the goal is solving environmental issues associated with improving the drinking water quality and related to environmental pollution with wastewater. METHODS: The microstructures, phase components, and elemental compositions of alloys and reaction products were studied by scanning electron microscopy/energy dispersive X-ray spectroscopy. The thermal effects of alloys were investigated usin thermogravimetry methods. Oil content in wastewater was determined by spectrophotometry. Oil particle dimensions and wastewater zero potentials were determined using electrophoretic light scattering method and residual turbidity by turbidimetry. Water quality assessment was included in the purified water analysis and comparison with the sanitary and epidemiological standards established for drinking water supply and wastewater intended for water discharge. FINDINGS: The structures and compositions of activated aluminum alloy containing metal activators-gallium, indium, and tin-from 0. 5 to 5 weight percent and aluminum polyoxychlorides based on it were studied using modern instrumental methods. The efficiency of the treatment of natural and oilcontaminated wastewater with aluminum polyoxychloride was assessed. The treated water parameters were within the norms established for drinking water supply and wastewater disposal by Sanitary Rules and Norms 2. 1. 4. 559-96. The efficiency of potable water treatment reached 90–, 99 percent. CONCLUSION: An effective and technologically simple method is developed for producing aluminum polyoxychloride. It involves dissolving an activated alloy in 1–, 5 percent hydrochloric acid, with an aluminum content of 98. 5–, 85 percent. Alloy processing is carried out at temperatures ranging from 60 to 65 degree celsius. The temperature rises from 20 to 25 degree celsius to the specified optimum without heat supply from the outside due to the interaction among reagents. The process is completed in 2–, 3 hours. The results confirm that aluminum polyoxychloride is an effective coagulant for drinking and wastewater treatment. The treated water is within the established limits in terms of hydrogen potential, chemical oxygen demand, and turbidity. The water treatment method can be easily implemented.

5XXX series of aluminum alloys are a category of novel alloys suitable for construction of ship hulls and the topside structures of offshore platforms.Within different 5XXX aluminum alloys, AA5083 is of great importance which is extensively used in ship construction industry. In the present study, formability of AA5083-H111 aluminum alloy is investigated at room temperature using uni-axial tensile tests and hydraulic bulge tests. Tensile tests were performed to evaluate material anisotropy in different directions with respect to rolling direction.Anisotropy coefficients were then used to correct flow stress curves obtained by balanced biaxial bulge tests. Moreover, flow stress curves obtained from both tests were separately introduced to an explicit commercial finite element code.Comparisons showed that numerical simulation carried out in this study stand in according with empirical results.

Thermal conductivity, specific heat capacity, enthalpy, entropy and free Gibbs energy of Zn55Al and Zn5Al alloys with additive erbium were studied using a new device according to cooling newton's law. It was observed that with increasing temperature, specific heat capacity, enthalpy and entropy of the alloys increase. A sharp reduction in thermal conductivity and specific heat capacity showed that in all the systems, there is the second order phase transformation about temperatures of 520 to 530 K. The thermodynamic factors are calculated.

The effects of Li on the microstructure and mechanical properties of Type A380 aluminum casting alloys have been examined. It is shown that, as the Li content is increased up to 0.1 wt.pct in the base alloy (Al-8.5 wt.%Si-3.5 wt. %Cu-1 wt.%Fe), Li successfully modifies the morphology of the b-Al5FeSi and eutectic Si phases from coarse intersected and branched platelets into finer and fibrous ones. The 0.06%wt Li-containing alloy exhibits higher strength and elongation, presumably due to both finer b-Al5FeSi and eutectic Si phases. In amounts greater than 0.06%wt lithium, Reduction of the strength and elongation can be due to increasing porosity and creation of other undesirable phases.

In drilling operation, the surface quality, cutting forces, burr formation mechanism and burr size (height, thickness), tool wear and tool life are considered as the important elements for drilling hole quality assessment which low amount of information is available in this regards. Therefore, on the basis of review of literature, the main aim of this work is to study the effects of MQL and dry lubrication strategies on thrust force, surface quality and burr formation morphology and size (height and thickness) when drilling 6061-T6. According to experimental observations, increased speed and feed rate under dry and MQL modes led to lower burr height, while under lower cutting speed, the direct effect of MQL is sensible. In addition, in dry drilling, lower average surface roughness was monitored. Those chips recorded under dry condition have higher quality and less segmentations on the free surface as compared to those chips recorded under MQL mode, which however resembles more hardness on the chips and higher cutting forces required for drilling operation.

Chromate conversion coating is applied on aluminum 6061. The optimum conditions for chromate bath composition and immersion time are also obtained for standard requirements provision such as corrosion resistance in salt spray test, electrical resistance and coating quality. The applied coatings are electrochemically tested in sea and distilled water. According to Tafel and cyclic polarization curves, the protection mechanism are evaluated in said environments. This evaluation has shown the formation of passive film layer, contains chromate and alumina on the base. The proper behavior of corrosion and electrical conductivity is probably due to this mechanism.

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