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Vinyl coatings technology was pioneered shortly after World War II to control the corrosion on steel dam gates along the Mississippi River. Previously, oil-based technology had resulted in paints that performed well on atmospheric exposed areas of the dams but failed quickly in the areas immersed in water. By the mid-1950s, their proven durability had made vinyl coatings the industry standard for marine applications.
Fluoropolymer resins find widespread use as building blocks for ultra-weatherable coatings. Fluoroethylene vinyl ether (FEVE) resins were developed to overcome some of the problems associated with the application of standard fluoropolymer coatings. FEVE resins, which yield topcoats with expected lifetimes exceeding 60 years, can be cured at ambient temperatures for field application, or at elevated temperatures in the shop. In order to allow coating manufacturers to conform to government regulations on solvents, water-based FEVE resins were developed several years ago.
Cashew Nutshell Liquid (CNSL) is a non-edible, renewable biomaterial extracted from the honeycomb-like structure of the cashew nut. Its main component, cardanol, is produced by the decarboxylation of CNSL and it contains a highly hydrophobic aliphatic side chain. Cardanol is used in the synthesis of phenalkamines, which are widely used in marine, protective and industrial coatings applications. Historically, phenalkamines have been used in solvent systems, but recently, a new technology was developed that enables a very hydrophobic phenalkamine to be stably packaged in water.
Two coatings were developed for the intended purpose of maintaining steel sheet pile at the waterfront. The new splash zone coatings are free of VOC’s and HAP’s thereby providing a more environmentally friendly alternative to the standard coal tar epoxy system. The new coatings are also more abrasion and impact resistant and applied at more than twice the thickness of coal tar epoxy. All of these factors add up to an anticipated service life of 3 to 4 times that of coal tar epoxy leading to reduced life cycle costs.
Pulsed Eddy Current (PEC) technology is a widely accepted inspection method now covered by several industry standards such as ISO(1) 20669, API(2) RP 583, and the new ASME(3) Section V (BPVC for Boiler and Pressure Vessel Code), article 21. PEC is a versatile inspection technology which provides an average remaining wall thickness through insulation and coatings. The technique can also be used to safely assess the minimum remaining ligament under corrosion scabs or blisters without surface preparation. PEC is resilient to liftoff variations and provides volumetric measurements of remaining material. It is capable of both detecting and assessing general corrosion on the outer surface of the pipes such as scabs and blisters, and detecting erosion or Flow Accelerated Corrosion (FAC) on the inner surface.
Potash is mined from deep underground deposits left by ancient inland seas or extracted from saltwater bodies. The typical composition of potash is 40% potassium chloride (KCl), 55% sodium chloride (NaCl) and 5% clay. About 95% of potash is used for fertilizer in agriculture; the remaining 5% is used in commercial and industrial products such as soap, water softeners, de-icers, drilling muds etc.
Hydrogen embrittlement has long been one of the most troublesome phenomena related to materials’ failures in the widespread Oil and Gas industry and yet it is the cause of recent failures and subject of new studies and analyses. Hydrogen embrittlement a form of environmentally assisted cracking (EAC) occurs when a material’s mechanical strength is weakened by the penetration of atomic hydrogen inside the material; the hydrogen sources are diverse and they all intervene in this phenomenon. In plated bolts the coating’s application may induce the penetration of hydrogen into the base-material cathodic protection by sacrificial coatings or impressed current may also have similar effect. The purpose of the present work is addressing the influence of different metallic coatings on the amount of hydrogen present in the steel bolting substrate in service conditions and relate it to the extent of hydrogen embrittlement; by co-relating environment stress and materials properties this investigation attempts to present safe alternatives to prevent hydrogen embrittlement failures.The tested samples were B7M ASTM A193/A193M bolts and 2HM ASTM A194/A194M nuts with the following coating conditions: 1) No coating 2) Zn plating 3) Zinc-Nickel plating and 4) Ni-Co ASTM B994 SC 18 Class 1 electroplating. Potentiodynamic tests in simulated sea-water solution evaluated the kinetics for hydrogen production on the different materials. Determination of hydrogen permeation into the substrate across the coatings was carried out in a Devanathan–Stachurski cell. Cathodic protection of -1.1 V vs Ag/AgCl in simulated seawater solution was applied to tensile samples varying the environmental pressure and the exposure time before breakdown in air. The results showed an outstanding performance of the Nickel-Cobalt coating compared to the sacrificial coatings; sacrificial coatings produced large currents by the cathodic reaction and allowed hydrogen penetration to the base-material Nickel-Cobalt produced less current and the permeation was much lower. The mechanical tests showed that Nickel-Cobalt is not affected by the cathodic charging while the tested sacrificial coatings reduce their mechanical resistance in a 50%.The results from this effort have an outstanding relevance in offshore and subsea deep-water drilling and production equipment that depends on high strength carbon and low allow steels. Nickel-Cobalt alloy ASTM B994 is proposed as the emerging technology for carbon and high strength steel bolts to be used in marine environment and subsea where failure is not an option.
Hardness and corrosion resistance of electroplated nanocomposite coatings are reported here in light of process parameters such as current density, boron addition and diamond nanoparticles. A boron source that enables greater incorporation of B in the coating was used.