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This article will improve the existing literature and develop the corrosion industry by expanding the knowledge of the CPHM system. I will also show one of the ways to increase the safety, availability and operational efficiency of aircraft.
The following article presents “Corrosion Prognostic Health Management" (CPHM) System used on helicopter Mi-24. Polish army spends millions of dollars annually on inspection, identification and repair of damage resulting from aircraft corrosion. That is why it is so important to reduce maintenance time and costs. CPHM System helps in this process by reduce maintenance costs and helps in improving the CPCP program. In order to increase aircraft safety, availability, and operational efficiency, Polish army use an on-platform monitoring system.
Aircraft representative galvanic test articles and witness coupons were placed out for atmospheric exposure testing at the U.S. Naval Research Lab (NRL) site in Key West, Florida. One set of test specimens was exposed to only ambient environment for a 62 day period; a second set of test specimens was exposed to both ambient environment (initial 62 days), and a short duration, twice daily, seawater spray protocol over a further 55 day period. Environmental loading was monitored using sensors that measured temperature, relative humidity, rainfall, and time of wetness (TOW), at 30 minute intervals. Following retrieval, the test articles were inspected in the laboratory using laser profilometry to characterize the spatial distribution and depth of corrosion damage. Mass loss measurement using the witness coupons was used to estimate relative corrosion rates for the two periods.
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Fiber reinforced polymer (FRP) and other polymeric materials are used in many ways to reduce and manage corrosion damage for industrial, infrastructure and municipal applications. It is common practice to use the term “resin” for polymers in these materials. This paper uses polymer interchangeably with resin. This paper will also only consider glass fiber reinforcements.
More and more High Pressure High Temperature (HPHT) sour wells are operated worldwide. Challenging material selection is required for such severe operating conditions.1,2 Very high strength materials, presenting yield strength above 896 MPa (130 ksi), are required for sustaining the pressure. Consequently, even a low amount of H2S in the gas phase may lead to a H2S partial pressure beyond the limit of 3.5 mbar (0.05 psi) established in NACE MR0175 / ISO 15156 standard.3 Indeed, both high yield strengths and partial pressures of H2S contribute to a situation where the risk of Sulfide Stress Cracking (SSC) is high. The present paper is focusing on the SSC resistance of 130 ksi minimum yield strength material developed for covering such HPHT applications.