Crude oils are predominantly made of organic compounds foremost hydrocarbons, trace compounds and corrosive compounds as well. The interaction between crude oils and ferrous metals causes some severe ascendency on the ferrous metals due to the corrosive compounds in crude oils with the collaboration of the chemical compositions such ferrous metals. In this research it was expected to investigate the effect of both Murban and Das Blend crude oils on the corrosion rates of seven different types of ferrous metals. The contents of sulfur, mercaptans, organic acids and salts in both crude oils were determined by to XRF analyzer, titration methods and salt analyzer while testing the chemical composition of each metal by XRF detector. Batches of similar sized metal coupons were prepared from each type of metal and the corrosion rates of each metal coupon were determined by the weight loss method while after 15, 30 and 45 days from the immersed day while observing the corroded surfaces through the 400X lens of an optical microscope. The hardness of each metal coupon was tested by Vicker's hardness tester before immersion in the crude oil and after corroded. The concentrations of ferrous and copper were tested in each crude oil sample after exposed to the metals by the atomic absorption spectroscopy (AAS). There were found some higher corrosive strength in Das Blend than Murban although found higher corrosion rates from four types of metals in Murban than Das Blend and relatively lower corrosion rates in stainless steels than the other metals. Apart from that there were found significant concentrations of ferrous and copper in some crude oil samples especially regarding carbon steels and Monel. Also, slight reductions of the initial hardness were found from each metal coupon after the corrosion eventually.

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Crude oil is a supreme earth resource that essential in most of industrial applications while having some adverse effects in the crude oil refining process regarding metals such as the corrosion. According to the general definition usually the corrosion is the formation of metal oxides, sulfides, hydroxides or any compound related with carboxylic group. In the environment of crude oils the corrosion is highly depended on the sulfur, organic acids, mercaptans and salts composed in crude oils and also the chemical compositions of such metals. In the current research it was expected to investigate the relative effects of corrosive properties on the rate of corrosion in seven selected types of metals which are frequently used in the Sri Lankan crude oil refining industry and the stability of those metals against the effect of both Murban and Das Blend crude oils regarding the composition and properties.Corrosive properties of both crude oils were determined using in order to XRF analyzer, titration methods and salt analyzer also the chemical compositions of each metal was determined by XRF detector. Batches of equal sized metal coupons from seven types of metal

Raw crude oils are mainly composed of various hydrocarbons while having trace amounts of corrosive compounds such as sulphur compounds, naphthenic acids, and salts. In the existing research, there were expected to investigate the impact of such corrosive properties on the corrosion of seven different types of ferrous metals. As the methodology, the major corrosive properties of selected two different types of crude oils and the chemical compositions of seven selected metal types were measured and analyzed by the standard methodologies and recommend instruments. The corrosion rates of such metals were determined by the relative weight loss method after certain immersion time periods simultaneously with the microscopic analysis of corroded metal surfaces. In addition, the decayed metallic elemental concentrations from metals into crude oils were analyzed by the atomic absorption spectroscopy (AAS) and the impact of the corrosion on the initial hardness of metals were measured by the Vickers hardness tester. As the results and outcomes of the entire research that there observed relatively lower corrosion rates from stainless steels with at least 12 % of chromium and some amount of nickel, higher corrosive impact from salts on the metallic corrosion, formations of FeS, Fe 2 O 3 , corrosion cracks and pitting on the metal surfaces, decay of copper and ferrous from some of metals sometimes in significantly and small reductions of the initial hardness of most of metals due to the corrosion.

Clay is a useful raw material for most of industrial manufacturing processes because of the unique physico-chemical properties and chemical compositions of such clays. The analysis of chemical compositions of some clay is an important strategy that related with the usages of such clay for various industrial purposes. In the existing research there were expected to test and analyze the chemical compositions of three different clay types that available in various locations in Sri Lanka using the X-ray fluorescence (XRF) technique. The clay samples were collected carefully from the available locations and stored well. The clay samples were labeled as anthill clay, brick clay and roof tile clay based on the applications and origins of such clays. A sufficient portion from each clay sample was selected and those samples were oven dried for 24hours under the temperature 110°C and sent for the X-ray fluorescence (XRF) analysis. As the results for the investigations, there were observed the elements of Fe, Ti, Ba and K in the amounts of 82.08%, 4.84%, 0.79% and 12.28% from anthill clay, Fe, Ti, Ca and Ba in the percentages of 84.38%, 5.92%, 7.56% and 2.14% in brick clay and Fe, Ti, Ba, Zr and K in the percentages of 75.72%, 2.95%, 5.30%, 3.36% and 12.67% from roof tile clay.