CORROSIONPROTECTION 59a55410d146d50b3036cdb1 False 24 25
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TSA Coating Service Thermal sprayed aluminium (TSA) coatings are widely specified for the protection of steels from aqueous corrosion, including offshore structures and components that are exposed to seawater immersion, tidal and splash zone environments. In this paper, the performance of TSA coatings prepared by conventional and newer wire thermal spray systems is presented. The TSA coatings were characterized in terms of deposition efficiency, coating micro structure including porosity and oxide content, surface roughness and coating adhesion. A cost analysis for coating deposition using the various systems is included. The corrosion behavior of the coatings was compared using an accelerated electrochemical corrosion test method. In addition, longer-term free immersion tests of up to 31 days were conducted in 3.5wt% NaCl solution, pH 7.9-8.2, 22-25°C. The TSA coating performance was quantified in terms of its free corrosion potential and the corrosion rate which was estimated from linear polarization resistance (LPR) measurements. The ability of the TSA coatings to provide adequate cathodic protection to exposed bare steel in immersed saline environment has been demonstrated. The newer systems have been shown to produce TSA coatings of improved quality and the effect of this on longer-term corrosion protection of steel substrates in immersed saline environment is discussed. Thermal Spray coating of Aluminium involves deposition of Aluminium of 99.5% purity over the prepared abrasive blasted surface. The sprayed metal is melted by using electric arc that is atomized with compressed air and projected over the substrate. According to the IS & BS Standards, the coating should be resistant up to 950 C temperature. The Aluminizing process is used to protect parts operating in high temperature environments against corrosion and oxidation. As a result, the most common parts coated are high temperature industrial chimney and muffler. Advantages : Site-job possible No size limitation Better surface preparation Cold process Pure aluminium coating Ideal surface for painting Standards : IS: 739 BS: 2569 Part I & II IS: 2590 BS: 1475
Stress Relieving Services A Mythri Metallizing (P) Ltd., we are rather proud to boast that we are equipped with the state-of-the-art , a 5x3x2.5 meters furnace for the purpose of Stress Relieving at our works in Peenya Industrial Area, Bangalore. Machining induces stresses in parts. The bigger and more complex the part, the more the stresses. These stresses can cause distortions in the part long term. If the parts are clamped in service, then cracking could occur. Also hole locations can change causing them to go out of tolerance. For these reasons, stress relieving is often necessary. Typically, the parts that benefit from stress relieving are large and complex weldments, castings with a lot of machining, parts with tight dimensional tolerances and machined parts that have had a lot of stock removal performed. Stress Relieving is the controlled heating and cooling of metals to alter their physical and mechanical properties without changing the product shape. Stress relieving is sometimes done inadvertently due to manufacturing processes that either heat or cool the metal such as welding or forming. Stress relieving is done at about 650°C for about one hour or till the whole part reaches the temperature. This removes more than 90% of the internal stresses. Alloy steels are stress relieved at higher temperature. After removing from the furnace, the parts are air cooled in still air. Stress Relieving is often associated with increasing the strength of material, but it can also be used to alter certain manufacturability objectives such as improve machining, improve formability, restore ductility after a cold working operation. Thus it is a very enabling manufacturing process that can not only help other manufacturing process, but can also improve product performance by increasing strength or other desirable characteristics. Steels are particularly suitable for heat treatment, since they respond well to heat treatment and the commercial use of steels exceeds that of any other material.
Bridge Metallizing Services All metals have properties that cause them to react as an anode or a cathode when coupled to another material in a corrosive environment. The application of zinc (anodic coating) to iron substrates forms a protective layer and results in corrosion protection referred to as cathodic protection or sacrificial protection. Aluminizing or Spray Galvanizing provides good mechanical interlocking based on quality abrasive blasted pre-treament. Coating thickness of up to 500 microns can be applied though the industry standard is 100-150 microns. Aluminizing process is ideal in high temperature environments to prevent oxidation and corrosion. Coating with sealants provides a base for paints for longer life to structures.
Thermal Spray Zinc Coating Services Atomized particles of molten Zinc are projected on to abrasive blasted steel surface from a special flame or arc pistol fed with Zinc wire. The process is often applied to structural components too large to be dipped in a galvanizing bath and to structures which are likely to distort during hot dip galvanizing. Zinc coatings for iron and steel provide excellent corrosion resistance in most atmospheres and in contact with many natural and synthetic substances. Zinc coatings are widely used to protect finished products ranging from structural steel work for Chemical, Fertilizer, Refinery, Cement, Power Plant, Buildings, Bridges, Pipelines, etc. The electrochemical relationship between zinc and steel enables zinc coatings also to protect steel at cut edges and at breaks in the coating by a sacrificial action. Applications : All steel structures Transformer tanks Radiators Dairy Coils Communication towers Steel Tanks Wind Mill Towers Electric Poles Gates Windows Building Structures Gutters in chemical-related industries Advantages : Proven long-term protection Cold process No size limitations Ideal surface for painting Site-jobs possible No hydrogen embrittlement Preferred even under alkaline condition Standard's : IS: 5905 BS: 5493 IS: 6586
Spray Galvanizing Services Atomized particles of molten Zinc are projected on to abrasive blasted steel surface from a special flame or arc pistol fed with Zinc wire. The process is often applied to structural components too large to be dipped in a galvanizing bath and to structures which are likely to distort during hot dip galvanizing. Zinc coatings for iron and steel provide excellent corrosion resistance in most atmospheres and in contact with many natural and synthetic substances. Zinc coatings are widely used to protect finished products ranging from structural steel work for Chemical, Fertilizer, Refinery, Cement, Power Plant, Buildings, Bridges, Pipelines, etc. The electrochemical relationship between zinc and steel enables zinc coatings also to protect steel at cut edges and at breaks in the coating by a sacrificial action. Applications : All steel structures Transformer tanks Radiators Dairy Coils Communication towers Steel Tanks Wind Mill Towers Electric Poles Gates Windows Building Structures Gutters in chemical-related industries Advantages : Proven long-term protection Cold process No size limitations Ideal surface for painting Site-jobs possible No hydrogen embrittlement Preferred even under alkaline condition
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