Alloy member and product

Abstract

This alloy member comprises Ru, a ferromagnetic element, and a metal which is neither Ru nor a ferromagnetic element, said alloy member being a corrosion-resistant member. The alloy member comprises 28-97 atm.% Ru and 2-77 atm.% the ferromagnetic element, with respect to the alloy member. The alloy member can contain an HCP phase in an amount of 50 vol% or larger.

Description

Alloy parts and products

[0001] The present invention relates to an alloy member and product having excellent corrosion resistance.

[0002] Traditionally, stainless steel and the like have been used in various fields as general-purpose materials. In recent years, studies have been conducted to improve corrosion resistance by forming a passive film or the like. Furthermore, development of metal materials with excellent corrosion resistance has also been promoted, and for example, alloys using metals with excellent corrosion resistance, such as Ti, have been developed (Patent Document 1). Furthermore, technology using highly reactive liquids has been applied to the decomposition of hazardous substances and the extraction of specific substances, and is expected to be applied to geothermal power generation in the future. For example, development of components with excellent corrosion resistance against supercritical water has been promoted (Non-Patent Document 1).

[0003] Patent No. 7175477

[0004] Taro Oe et al., "Corrosion Tests of Noble Metals and Ti-IrO2-Ta2O5 in Supercritical Water and Subcritical Water Oxidation Environments Containing Hydrochloric Acid," Materials and Environment, Vol. 56, No. 8, pp. 367-372, 2007.

[0005] However, all of these materials lacked versatility and were still not satisfactory in terms of corrosion resistance. For example, forming a passive film on stainless steel required a complicated process, and the formation method was not easy, resulting in an unsatisfactory result. Furthermore, alloys also had problems, such as difficulty in workability and deterioration of mechanical properties due to the generation of unintended crystalline phases, due to the difficult formation method. Furthermore, the corrosion resistance of various materials, such as stainless steels, Ni-based superalloys, Ti-based alloys, and precious metals, to supercritical water has been investigated, but problems have been found in corrosion resistance, or, while precious metals have excellent corrosion resistance, problems have been encountered, such as deterioration of mechanical properties.

[0006] The present invention has been made to solve the above problems, and has as its object to provide an alloy member having excellent corrosion resistance and mechanical properties.

[0007] The alloy member according to the present invention is an alloy member containing Ru, a ferromagnetic element, and a metal other than Ru and the ferromagnetic element, and contains Ru at 28 atomic % or more and 97 atomic % or less and the ferromagnetic element at 2 atomic % or more and 77 atomic % or less.

[0008] In one example of the alloy member, the alloy member contains 50% by volume or more of the HCP phase.

[0009] In one example of the alloy member, the metal is Mo or W.

[0010] In one example of the alloy member, the metal is Re.

[0011] In one example of the alloy member, the ferromagnetic element is one or more metals selected from Fe, Co, and Ni.

[0012] In one example of the alloy member, the alloy member is formed in a film shape.

[0013] In one configuration example, the alloy member is a corrosion-resistant member.

[0014] The product according to the present invention includes the alloy member or corrosion-resistant member described above.

[0015] As described above, according to the present invention, an alloy member having excellent corrosion resistance and mechanical properties can be provided, since it contains 28 atomic % or more and 97 atomic % or less of Ru and 2 atomic % or more and 77 atomic % or less of a ferromagnetic element.

[0016] An alloy member according to an embodiment of the present invention will be described below. This alloy member is a corrosion-resistant member containing Ru, a ferromagnetic element, and a metal other than Ru and the ferromagnetic element. This alloy member contains 28 atomic % to 97 atomic % of Ru and 2 atomic % to 77 atomic % of the ferromagnetic element.

[0017] The alloy member may contain 50% by volume or more of the HCP phase. Preferably, the alloy member contains 75% by volume or more of the HCP phase. This configuration further improves the corrosion resistance of the alloy member.

[0018] In addition, in this alloy member, the metal can be at least one of Mo and W. This configuration can further improve the corrosion resistance and mechanical properties of the alloy member. At least one of Mo and W can be contained in the alloy member in an amount of 1 atomic % or more and 40 atomic % or less.

[0019] The alloy member may also contain Re as one of the metals. By including Re, the corrosion resistance and mechanical properties of the alloy member can be further improved. Re may be contained in the alloy member in an amount of 1 atomic % or more and 40 atomic % or less.

[0020] The alloy member may also contain one or more metals selected from Fe, Co, and Ni as ferromagnetic elements, which can further improve the corrosion resistance and mechanical properties of the alloy member.

[0021] Furthermore, the alloy member according to the embodiment may contain inevitable impurities in the raw materials as constituent materials.

[0022] The alloy member according to the embodiment can be used as a corrosion-resistant member, for example, in the form of a film. This alloy member can be used as is, or by using known forming techniques, and can be suitably applied to applications requiring corrosion resistance, such as reaction vessels and piping. Furthermore, the alloy member can be provided on the contact surface of a highly reactive fluid in various products. Examples of highly reactive fluids include hydrochloric acid, nitric acid, sulfuric acid, and hydrofluoric acid.

[0023] Furthermore, when the alloy member according to the embodiment is used as a container material, it can be used as the inner wall material of the container. Furthermore, when the alloy member according to the embodiment is used as a piping material, it can be used as the inner wall material of the piping. The piping can be suitably used, for example, as a casing pipe, a strainer pipe, a line pipe, an electrode, a heat pipe for use in a heat exchanger, etc.

[0024] [Example 1] Ru 0.6 Fe 0.02 Mo 0.13 W 0.25Alloy samples were prepared and subjected to an HF immersion test. SUS316 was used as a comparative sample. As is clear from Table 1, the alloy members according to the embodiment had excellent corrosion resistance and mechanical properties.

[0025]

[0026] The present inventors have conducted extensive research to achieve the object of providing an alloy member having excellent corrosion resistance and mechanical properties, and have found that an alloy member containing Ru, a ferromagnetic element, and a metal other than Ru and the ferromagnetic element, in which the alloy member contains 28 atomic % to 97 atomic % of Ru and 2 atomic % to 77 atomic % of the ferromagnetic element, has excellent corrosion resistance and can solve the above-mentioned conventional problems at once. After obtaining the above knowledge, the present inventors have conducted further research and have completed the present invention.

[0027] As described above, according to the present invention, in an alloy member containing Ru, a ferromagnetic element, and a metal other than Ru and the ferromagnetic element, the Ru content is 28 atomic % or more and 97 atomic % or less, and the ferromagnetic element content is 2 atomic % or more and 77 atomic % or less, so that an alloy member having excellent corrosion resistance and mechanical properties can be provided.

[0028] It should be noted that the present invention is not limited to the embodiments described above, and it is clear that many modifications and combinations can be made by a person having ordinary knowledge in the art within the technical concept of the present invention.

Claims

1. An alloy member containing Ru, a ferromagnetic element, and Ru and a metal other than the ferromagnetic element, the alloy member containing Ru at 28 atomic % or more and 97 atomic % or less, and the ferromagnetic element at 2 atomic % or more and 77 atomic % or less.

2. The alloy member according to claim 1, which contains 50% by volume or more of the HCP phase.

3. An alloy member according to claim 1, wherein the metal is Mo or W.

4. An alloy member according to claim 1, wherein the metal is Re.

5. An alloy member according to claim 1, wherein the ferromagnetic element is one or more metals selected from the group consisting of Fe, Co and Ni.

6. The alloy member according to claim 1, which is formed in the form of a film.

7. The alloy member according to claim 1, which is a corrosion-resistant member.

8. A product comprising the alloy member or corrosion-resistant member according to claim 1.

Images