Sermalon® Coating for Turbomachinery

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SermaLon® Coating for Turbomachinery The patented three-part SermaLon® • Excellent bond strength coating system was developed • Continuous protection against primarily to provide anti-fouling relative humidity to 100 and corrosion protection to driven percent, and with continuous compressor components and salt/mist in air industrial gas turbine components • Excellent coating ductility exposed to wet chloride attack, as • No hydrogen embrittlement well as steam turbine components. problems • High resistance to corrosion The SermaLon coating system fatigue consists of: • Excellent resistance to hydrocarbon fouling • An aluminum-filled chromate/ phosphate bond coat Applications Centrifugal compressor rotor coated • An intermediate high- with SermaLon SermaLon coating is designed to be temperature polymeric used on ferrous substrates such as: inhibitive coating • Centrifugal compressors exposed • Steam turbine components • A PTFE-impregnated topcoat to sour gas, wet chlorides, or exposed to corrosive steam that provides a barrier excessive fouling, especially by • IGVs of industrial gas turbines against corrosion and excellent ethylene and other hydrocarbons resistance to fouling Physical Properties The coating system provides excellent protection to carbon and Thickness 0.004 to 0.006 inches (100 to 150 µm) stainless steel substrates when Maximum Continuous 500°F (260°C) exposed to hydrocarbons, corrosive Operating Temperature steam conditions, sour gas or low pH wet chloride environments. Peak Operating Temperature/Time 600°F (315°C)/1 hour Advantages pH Operating Range 3 to 9 The benefits of using SermaLon Performance Data (2 mil (50 µm) coating on 1010 steel) include: Test Results • Smooth surface finish and PTFE- Salt Spray (ASTM B117) > 3000 hours with no red rust On 410 stainless steel impregnated topcoat contribute to performance recovery and Adhesion (ASTM D3359) 5B, no pickoff, excellent reduced fouling rate • Superior resistance to acid rain, 100% Humidity (ASTM D2247) 3000 hours–no effect deicing fluids, decontamination Surface Finish < 40 microinches Ra at 0.8 mm cutoff fluids, hydraulic fluids, lube oils, (On new machined external surfaces) < 1.0 microns Ra at .030" cutoff and jet fuels. Praxair Surface Technologies, Inc. © Copyright 2010 Praxair S.T. Technology, Inc. Printed in the United States of America 1500 Polco Street All rights reserved 09-2010 Indianapolis, IN 46222 Praxair, the Flowing Airstream design, and SermaLon Printed on recycled paper www.praxairsurfacetechnologies.com are trademarks of Praxair S.T. Technology, Inc. in the P-10286 [email protected] United States and/or other countries. Telephone: The information contained herein is offered for use by +1 317 240 2500 technically qualified personnel at their discretion and Fax: risk without warranty of any kind. +1 317 240 2255 C:\Documents and Settings\idyewlc1\My Documents\marketing communications\data sheets\Layout Files\P10286_SermaLon_turbomachinery\P10286_SermaLon_turbomachinery.indd1 September 23, 2010 12:23 PM page.

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Effect of Hydrogen Embrittlement on Fatigue Life of High Strength Steel
ISSN: 2455-2631 © April 2019 IJSDR | Volume 4, Issue 4 EFFECT OF HYDROGEN EMBRITTLEMENT ON FATIGUE LIFE OF HIGH STRENGTH STEEL 1 2 Alok Kumar , Manish Vishwakarma 1M.Tech. Scholar, 2Assistant professor Department of Mechanical Engineering, Maulana Azad National Institute of Technology, Bhopal 462003, Madhya Pradesh, India Abstract: this paper deals with definition of hydrogen embrittlement, causes and mechanism which causes hydrogen diffusion take place in to the base material. Hydrogen embrittlement is responsible for subcritical crack growth and catastrophic failure in material. Hydrogen embrittlement causes due to high hydrogen concentration in the material. Different type of testing has been done to check the strength and properties of material. The microstructure analysis was done by scanning electron microscope (SEM) and transmission electron microscope (TEM) Keywords: High strength steel, Hydrogen embrittlement, SEM, TEM, subcritical crack growth 1. Introduction: Hydrogen embrittlement is a process by which steel become brittle and fracture due to subsequent diffusion of hydrogen in to the metal. During hydrogen embrittlement hydrogen is reacted to the surface of a metal and individual hydrogen atoms diffuse through the metal, because the solubility of hydrogen increases with higher temperatures, high temperature can increase the diffusion of hydrogen. When facilitate by a concentration of hydrogen where there is significantly more hydrogen outside the metal, hydrogen diffusion can also occur at lower temperatures. These individual hydrogen atoms within the metal gradually mixes to form hydrogen molecules, creating pressure from within the metal. This pressure may increases the levels where the metal has reduced ductility, toughness, and tensile strength, up to the point where it cracks initiated.
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