The present work investigated the effect of the common gaseous pollutants on silver artifacts corrosion. The study will be carried out on manufactured coupons of silver alloy (91 silver, 9 copper) which have chemical composition similar to ancient Egyptian silver artifacts. These coupons will be exposed to gaseous pollutants of each individual gas; such as Sulfur dioxide, Nitrogen dioxide, Carbon dioxide, Hydrogen sulfide and Chlorine. The exposure period will be four weeks in a climate chamber with gas concentration 10 PPM. After the test Examinations by SEM and PM were used to evaluate the effect of each gas and description the morphology of the corrosion layers. The results revealed that all gases reacted with the surface except carbon dioxide. The formed tarnishing layers varied in coverage and density rate. Corrosion products are analyzed by XRD and the results revealed Ag 2 S, AgCl, Ag 2 SO 4 and Ag 2 O as corrosion products.
In this paper, a sword is investigated from a collection of archaeological iron swords displayed in the Egyptian Museum from the civilization centered on Ballana and Qustul in Egyptian Nubia (380-600 A.D.). A range of metallographic analytical techniques have been used to characterize the sword's metallic structure and its rust crust. The results revealed that the sword was made of low-carbon steel and corrosion products formed on the surface are iron sulfate, iron oxides/hydroxides including goethite, maghemite, magnetite, lepidocrocite, akaganeite and ferric chloride. The investigation also revealed that the rust crust constituted of two corrosion layers: a dense layer and a transformed medium. Crystals of soil minerals were clearly observed in the outer corrosion layer. Moreover, several microstructural features were detected, indicating the stage of deterioration and the features of metallurgy of this sword. Furthermore, the obtained results have been used to select appropriate conservation procedures for preventing degradation in the future and ensuring its reliable restoration.
Imidacloprid, a neonicotinoid pesticide, was used extensively to control whitefly (Bemisia tabaci) on tomato crop worldwide. Current study aimed to determine residue amounts of imidacloprid in tomato fruits after different time intervals of application and to evaluate their detrimental effects on white albino rats. Results revealed that the initial deposit (residue amount after 1 h of last spray application) was 0.316 mg kgG . Current study highlighted that there was no residual toxicity of imidacloprid after 14 days of last application.
The work aims to study the manufacturing technique, microstructure features, and morphology and mechanism corrosion of a hammered copper basin belonging to one of the early metallurgy ages in ancient Egypt ( the old kingdom). The examination and analysis were carried out by USB microscope, polarized light microscope, scanning electron microscope equipped energy dispersive X-ray and X-ray diffraction. The results revealed that the basin was made of pure copper metal and manufactured as one piece by a hammering method. Metallographic examination showed a recrystallized microstructure, composed by the mechanical process for manufacturing the basin throughout hammering and annealing. The cylindrical body (rim) was in well- preserved state although it was covered with a thin layer of usual green corrosion products. The pustules of warty corrosion were formed on the inner surface of the rim. The curly shape of malachite corrosion were also observed. The morphology and mechanism of warty corrosion were presented and the difference between this type and the pitting corrosion was discussed. The characterization of the basin contributed to understanding and evaluating the preservation condition, which contributes to choosing the appropriate conservation process.
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