A method of applying a protective coating to an article comprises the steps of a) depositing aluminum in a surface region of an article, and b) depositing chromium is the surface region of the article subsequent to step a), whereby at least a portion of the chromium replaces at least a portion of the aluminum. Another method and an article are also disclosed.

A method of applying a protective coating to an article comprises the steps of a) depositing aluminum in a surface region of an article, and b) depositing chromium is the surface region of the article subsequent to step a), whereby at least a portion of the chromium replaces at least a portion of the aluminum. Another method and an article are also disclosed.

A method of applying a protective coating to an article comprises the steps of a) depositing aluminum in a surface region of an article, and b) depositing chromium is the surface region of the article subsequent to step a), whereby at least a portion of the chromium replaces at least a portion of the aluminum. Another method and an article are also disclosed.

Provide a metal surface reforming method enabling metallic products with superior characteristics such as surface hardness, heat resistance, corrosion resistance, high temperature oxidation, high temperature corrosion, and environmental corrosion and the like. Halogenation treatment of heating and retaining a base material in an atmosphere containing a halogen based gas is performed on a base material of iron based metal or nickel based metal, then nitride processing of heating and retaining the halogenated base material described above in an atmosphere containing a nitrogen source gas is performed, then chromizing treatment is performed by placing the nitrided base material in a powder containing metal chromium powder to form a surface reformed layer on the base material described above. These metallic products obtained have high hardness, superior heat resistance and corrosion resistance, and exhibit superior performance in high temperature oxidation, high temperature corrosion, erosion, and cavitation and the like environments. Further, the metallic products described above exhibit superior performance in acid or alkali environments, neutral environments, and corrosive environments such as chlorides like salt water.

Provide a metal surface reforming method enabling metallic products with superior characteristics such as surface hardness, heat resistance, corrosion resistance, high temperature oxidation, high temperature corrosion, and environmental corrosion and the like. Halogenation treatment of heating and retaining a base material in an atmosphere containing a halogen based gas is performed on a base material of iron based metal or nickel based metal, then nitride processing of heating and retaining the halogenated base material described above in an atmosphere containing a nitrogen source gas is performed, then chromizing treatment is performed by placing the nitrided base material in a powder containing metal chromium powder to form a surface reformed layer on the base material described above. These metallic products obtained have high hardness, superior heat resistance and corrosion resistance, and exhibit superior performance in high temperature oxidation, high temperature corrosion, erosion, and cavitation and the like environments. Further, the metallic products described above exhibit superior performance in acid or alkali environments, neutral environments, and corrosive environments such as chlorides like salt water.

The invention relates to thermochemical treatment of metal products, in particular relates to the technology of applying protective anti-corrosion coatings, which may be used for applying zinc-based thermodiffusion coatings (TDC coatings) on parts of different shapes, preferably on steel pipes of oilfield assortment, couplings, as well as fasteners and other products. A method of the invention relates to application of a thermodiffusion zinc-based coating to steel pipes, and comprises the steps of loading the pipes, a saturating mixture containing two-component zinc powder, activator and flux into the container; hermetically closing the container; vacuuming; filling the container cavity with non-oxidizing gas; heating and maintaining the container at a predetermined temperature; subsequent cooling the container and removing the pipes, characterized in that the first component of the two-component zinc powder having needle-shaped particles of 3-8 microns in size is loaded into the internal cavity of the pipes, and a second component of two-component zinc powder having spherical particles of 8-25 microns in size is loaded directly into container, and exposure being carried out at a temperature of 300-425? C., while a flux of one or more tertiary amines is introduced into the saturating mixture in an amount of 0.1-1.0 mas %; a filler containing one or more components selected from the group consisting of silica, wollastonite, carbon black, aluminum oxide and copper alloys, in the following ratio components in mass %: flux 0.1-1.0; filler 25-45; two-component powder zinc-the rest. Also claimed is a steel pipe having a hollow body with thermodiffusion zinc-based coating, characterized in that the coating is obtained using the method described above. The technical result of the invention is achieved by reducing the duration of exposure of the pipes in the temperature range of the thermodiffusion process when obtaining the coatings of a given thickness with improved corrosion resistance durability, uniformity and density of the coating over the entire surface of the pipe, as well as reducing the energy costs and increasing productivity, while ensuring high strength of pipes processed by the present method.

Disclosed is a process for producing an alloyed, in particular multiple-alloyed aluminide or chromide layer on a component by alitizing or chromizing. First a green compact layer (9) consisting of a binder (5) and metal particles (7) is deposited on the component (1) to be coated and then alitizing or chromizing is carried out, binder and metal particles being deposited on the component separately from one another, first the binder and then the metal particles. A turbine component produced by this process is also disclosed.

Disclosed is a process for producing an alloyed, in particular multiple-alloyed aluminide or chromide layer on a component by alitizing or chromizing. First a green compact layer (9) consisting of a binder (5) and metal particles (7) is deposited on the component (1) to be coated and then alitizing or chromizing is carried out, binder and metal particles being deposited on the component separately from one another, first the binder and then the metal particles. A turbine component produced by this process is also disclosed.

The present invention provides a method for manufacturing a finished metal object or product having a corrosion resistant layer integral to or within a top portion of at least one of its surfaces that would be exposed to a corrosive environment. In one embodiment, the method for manufacturing is directed to a finished metal tubing product having a corrosion resistant layer within its inside surface that is exposed to a fluid and wherein the corrosion resistant layer is a zinc-metal oxide layer, such as a zinc-chromium oxide layer, or a zinc-mixed metal oxide layer. In addition to methods of manufacturing, the present invention provides finished metal objects or products having a corrosion resistant layer integral to or within a top portion of at least one surfaces that would be exposed to a corrosive environment.

According to an exemplary embodiment, a gas turbine element made of a hardened titanium alloy may be provided. The hardened titanium alloy may be made by a process which may include but may not be limited to, obtaining an element made of titanium alloy, treating a surface of the element made of titanium alloy with beryllium using diffusion process, and forming a titanium beryllide diffusion layer to a predetermined depth from the surface.