In the marine environments, NiCrAlY coatings with high content of Cr would suffer much severer corrosion due to effect NaCl. Thus, NiSiAlY different Si were proposed and deposited on Ni-based superalloys by multi-arc ion plating. The as-deposited coating was mainly composed γ’-Ni 3 Al phase a small amount β-NiAl phase. NaCl-induced hot tests performed at 500°C, 600°C, 700°C, respectively. Compa...

Hot corrosion is a critical problem in wide range of high-temperature applications. Ni–20Cr alloy frequently used such applications owing to its good hot-corrosion resistance. In the current work, thick plates thickness 6–10 mm were fabricated using cold spray-based additive manufacturing (CSAM). High-pressure spraying was with nitrogen as propellant gas. Pre- (substrate heating, SH) and post-h...

The objective of this research work is to optimize the time of exposure for hot dip galvanizing of mild steel, so as to achieve such a microstructure of zinc coating that protects mild steel for long against atmospheric corrosion. In order to decide the above mentioned parameter the polished samples, one at a time, were dipped in to 500 g molten zinc at 460 to 470 oC in the crucible for a diffe...

MIT has been benchmarking Japanese and German NACOK air ingress tests using the FLUENT code for approximately three years [1]. The first benchmark study was for Japan Atomic Energy Research Institute’s (JAERI) isothermal and non-isothermal experiments [2] which investigate molecular diffusion of N2, and He under isothermal and natural circulation conditions, respectively. Another set of benchma...

This thesis considers a nanotechnology approach based on the production of metals pre-treatments and organic coatings (a complete protection system at all) designed from the nanoscale. The final aim is to develop protection systems with improved corrosion protection properties and a low environmental impact. In particular, multifunctional silane hybrid molecules were used to design sol-gel pre-...

Titanium alloys exhibit mechanical and physical properties that fit structural applications demanding light-weight, corrosion resistance and biocompatibility. Ceramic reinforcements can further improve some of these mechanical properties, such as wear resistance, specific stiffness and specific strength. In comparison to continuous reinforced titanium alloys, the particle reinforced alloys (PRT...

The recycling of waste plastics that include plastics that contain chlorine, such as polyvinyl chloride, is difficult because the chlorine leads to the corrosion of equipment. Then, the dechlorination method of waste plastics containing chlorine (CCWP) that consists of a series of melt process and hot water process was examined. CCWP was put into the melt process with coal tar (HOB) and convert...

Corrosion of steel reinforcement in concrete structures and bridges is a major problem facing the departments of transportation worldwide. In the United States, maintenance and replacement costs are measured in billions of dollars. Salt environment in hot climate and the use of deicing salts in cold regions have resulted in steady deterioration of bridge decks due to corrosion. These concerns h...

At present, the common protection technology of power-transmission and transformation equipment is mainly coating hot-dip zinc protection. However, due to low adhesion epoxy zinc-rich coating, poor compatibility with top paint, environmental pollution, complex processing, high energy consumption other defects process, its development limited. In view above deficiencies, new anti-corrosion mater...