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Choosing the right colors for any paint job is very important and can be fun. Remember when you were a child and got a coloring book for your birthday? Imagine if your canvas for coloring wasn’t bound pages, but rather the amazing Brooklyn Bridge. Wouldn’t that be exciting?
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Precipitation hardenable nickel alloys N09925, N07718, N09945, N09946 and N07725 provide high strength and excellent sour service corrosion resistance for critical downhole oilfield applications. This family of alloys achieves yield strength minimums ranging from 120 to 160 KSI (827-1103 MPa) and can withstand high temperatures and partial pressures of H2S. The primary strengthening mechanism is the formation of γ’ and γ” nanometer sized particles during an age hardening heat treatment.
As the building design, construction, and enforcement communities become increasingly aware of the connections between air infiltration, energy efficiency, and general performance, the concept of the “continuous air barrier” is making its way into buildings. One reflection of this is seen in proposals to require air barriers in the national model building energy codes.
Root cause analysis involves a detailed process of evidence collection, investigation of the evidence, subsequent analysis, and identification of corrective actions based on conclusions drawn from the evidence. The process when diagrammed out seems simple, however paramount to the process is identifying the problem or failure accurately. Misunderstanding the failure leads to misidentification of the root cause which in turn begets mitigation efforts that may or may not impactfully remediate the original failure.
Norsok M-650 qualification of 13Cr Super Martensitic Stainless Steel (SMSS) requires sulphide stress corrosion cracking (SSC) testing. The present investigation evaluated three casts processed by hot rolling and heat treated to a specified minimum yield strength (SMYS) of 110ksi. Testing was conducted as per NACE TM0177 Method A by two testing laboratories under identical conditions.The influence of microstructural phases specimen preparations and control of test parameters are assessed in relation to SSC performance. Specifically this paper discusses the complexities of SSC testing from a steelmaker’s perspective.
Austenitic stainless steels (AuSS) are widely used as structural materials for nuclear reactor vessel internals (RVIs), as well as for fuel cladding and pressurizer components. Some of these components cannot be removed and replaced, and therefore the irradiation performance of the steel determines the lifetime of each reactor component. Typical irradiation-induced detrimental effects in light water-cooled power reactors include embrittlement, accelerated creep, and radiation-altered corrosion. Some second-order effects such as void swelling, hydrogen accumulation, and radiation-induced phase instability might be slowly evolving to first-order importance, especially as Western nuclear power plants are being considered for lifetime extensions to 60 and possibly 80 total years.
The logistics of painting commercial buildings can be focused into four categories: Pre-inspection of the building, communication, planning, scheduling and implementation. The challenges of painting commercial stores during operation include, but are not limited to, pre-existing building conditions, management cooperation, weather conditions, store schedule, customer accessibility to merchandise, and protecting store merchandise and customer property from overspray or equipment damage.
Aromatic polyurethane coatings are often used in the protection of steel water pipelines from corrosion. Unfortunately, pipeline sections may be stored above ground for many months before installation so the coatings yellow, lose gloss and can chalk. This deterioration in appearance naturally creates doubt about the corrosion protective qualities of the coatings.
During crack growth and localized corrosion, fresh metal surfaces become exposed to the chemical and electrochemical environment. Subsequent alteration of the material in the nascent pit or at the crack tip zone will be initiated by the surface chemical processes that template the subsequent reactivity. Quantum chemical calculations can provide a physics-based method to simulate the adsorption phenomena that occur in systems possessing multiple chemical species (such as water, chloride, hydrogen-sulfide, inhibitors, etc.), various pH levels, temperatures and electrochemical conditions.
Aerospace Coatings is rapidly becoming more complex as a technical discipline. Professional certification of Aerospace Coatings Technicians, to an industry standard, is now possible and going forward, should not be regarded as optional for Aerospace Coatings operations.