Abstract
The construction of gas and oil plants include many items such as steel structures, equipments, piping, tanks and vessels at different conditions such as offshore, onshore, above and underground shall be protected against corrosion by coating. The protective value of a coating system is proportional to the surface preparation; the objectives of the surface preparation are the surface cleanliness and the surface profile of the substrate. The surface preparation is usually achieved by blast cleaning using different types of abrasive. Due to its high hardness and low cost, silica sand has been used extensively for impact abrasion. It is, however, very brittle with most grain disintegrating on impact, causing excessive levels of siliceous dust which is a major health hazard and causes serious environmental pollution. Consequently, it has been banned as impact abrasive material in most countries around the world. Considerable research has been done in the last twenty years to find an impact abrasive material as hard as silica and that respects. So it was important to search for sand substitution among the local abundant minerals in Egypt. Waste product obtained from ilmenite ore extracted from the mine was found to be the most suitable alternative abrasive. This work shows the abrasive types, the occurrence of the ilmenite ore. The chemical properties, physical properties and microscopic examination of the waste were investigated. The obtained result indicates that, the waste product obtained from ilmenite ore can be utilized for abrasion as sand substitution.
Highlights
Blast cleaning is a tried and tested method of cleaning metal surface and preparing them for coating or for such sophisticated modern finishing process are necessary to resist corrosion in the atmosphere, under water or in the aggressive environments
Occurrence and Characteristics of the Egyptian Ilmenite and Takla [16] described the mineralogy of ilmenite as 1) Homogeneous ilmenite free of any exsolution lamellae is mainly present in the gabbroic rocks where it constitutes the principal type of ilmenite
The deposits of ilmenite ore occurs in Wadi Abu Ghalaga in the South part of the Eastern Desert, the area comprises the eastern portion of Hamata sheet, 30 km of Red Sea and 100 km South Marsa Alam, The deposits of Wadi Abu Ghalaga included two main parts, the eastern part consists of metavolcanics and the western part composed of ilmenite deposit surrounded by gabbroic rocks and these in turn are bordered from the western and southeastern sides by a biotite gneissose granite [12]
Summary
Blast cleaning is a tried and tested method of cleaning metal surface and preparing them for coating or for such sophisticated modern finishing process are necessary to resist corrosion in the atmosphere, under water or in the aggressive environments. The cleanliness of steel surface is judged in comparison with agreed standard. Swedish Standard Applies to steel which being prepared by blast cleaning or mechanical methods (scraping and wire brushing). The standard provides both a description and appropriate photograph of the surface condition of the steel prior to any surface preparation and after surface preparation. British Standard (BS) Refers only to the condition of the steel surface after grit blasting, The standard provides a detailed description of the level of surface cleanliness; in addition the standard makes the reference to surface roughness (profile) and the use a British Standard of abrasive. The ISO standard gives pictorial standards for surface preparation using different type of abrasives and for flame cleaning. Where new steel work is being prepared for painting, the steel surface should be classified of rust grade A, B, C or D [3]
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