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In our effort to continue to provide the best quality materials testing services, KnightHawk Engineering Materials Lab (KML) has successfully obtained accreditation to the ISO/IEC 17025:2005 standard. Accreditation to this International Standard indicates KML operates under a management system for quality, administrative and technical operations that also meets the principles of ISO 9001, with demonstrated competency in several ASTM test methods.

Our accredited scope of testing includes Hardness (Rockwell B and C, Vickers Micro and Macro Hardness), tensile testing, Energy Dispersive Spectroscopy, Corrosion rates and micro-etching). While these accredited test methods represent a major component of the testing we conduct, KML also specializes in development and execution of customized testing to satisfy client specific needs. We have experience in developing and conducting tests that range from long term high pressure and high temperature corrosion testing to screen reactor materials, creep testing of clad wiring, torsion testing of large equipment bolts, to tests designed to simulate operating loads and conditions experienced by components. KML has experienced technicians and Ph.D. level engineers that can also assist you in determining deformation and fracture mechanisms and modes of failure of components, equipment and systems made of metallic, polymeric and other industrial materials. Whether it is a standard test, a highly customized test, or determination of the failure mechanisms/modes, KML can help you with your testing needs in a timely fashion.

This impeller failure was associated with severe erosion-corrosion assisted cavitation damage. In general, cast stainless steels materials possess excellent corrosion resistance. However, in this case the change in cross-section of the impeller likely caused turbulent conditions, whicih coupled with thpresence of calcium hypochlorite and sulfuric acid in the system, caused erosion-corrosion and cavitation damage. Uniform thinning with cavitation was observed on the impeller blades.

Cavitiation is a typical damage mechanism in high-velocity fluid environments which experiences pressure change creating boiling conditions at lower temperatures. Collapsing bubbles produced during boiling on the material surface generates shock waves that causes material removal.