Nippon Mining Co., Ltd.

Nippon Mining & Metals Co., Ltd.

Kazuhiro Taki

Yasuhiro Mitsuyoshi

Norio Yuki

Hideo Sakuyama

Takeshi Shiraki

Ryoichi Nobuyoshi

Tetsuo Kawahara

Akio Saito

The creep property of a shadow mask, which has cathode-ray passing apertures, in the form of dots or slots formed by etching, and to which tension is then applied without undergoing press-forming, is enhanced. The Fe&mdash;Ni alloy containing from 30-50% of Ni, the balance consisting of iron and unavoidable impurities, has cold working temper of not less than 30% and not more than 57% of the final working degree.

Fe-Ni alloy for tension mask and tension mask using it and color crt

A method of producing a titanium material having enhanced resistance to hydrogen absorption in aqueous hydrogen sulfide solutions which comprises removing a layer of at least 0.5 .mu.m depth from the surface of a titanium material that has been annealed after cold rolling so that titanium nitride, titanium carbide, or titanium carbonitride formed on the surface is removed. It is preferable that the titanium material has no flaw in the depth beyond 10 .mu.m from the surface. It is desirable that the titanium material is polished so that it has a surface roughness Rmax not exceeding 3.0 .mu.m. It is also preferred that the titanium surface has an oxide film ranging in thickness from 15 to 500 nm formed thereon.

Method of producing titanium material resistant to hydrogen absorption

The invention provides (1) a titanium alloy with excellent corrosion resistance consisting essentially of 10-40 wt % of Mo, 0.1-15 wt % of Cr, and the balance of Ti and unavoidable impurities and (2) a titanium alloy according to (1) which further contains 0.01-2.0 wt % (in total) of Ru, Ir, Os, Pd, Pt, or/and Rh. The addition of Mo allows Ti-based alloys to form on the surface a protective film with a high concentration of Mo, whereby their corrosion resistance in non-oxidizing acids, such as hydrochloric and sulfuric acids, is markedly improved. In environments where oxidants are present, even but a few ppm in amount, Mo comes out in solution, seriously affecting the corrosion resistance of the alloys. To avoid this, Cr must also be added. The addition of Cr helps keep Mo from dissolving out and thereby prevent the deterioration of corrosion resistance by the action of oxidants in the environments. The platinum group elements, singly or in combination, further improve the corrosion resistance.

Titanium alloys with excellent corrosion resistance

There is provided an insoluble anode for producing manganese dioxide by electrolysis characterized in that the surface layer or the entire anode is made of a titanium alloy of from 0.5 to less than 15 percent by weight of nickel, the remainder being titanium and unavoidable impurities. The titanium alloy preferably has thereon Ti.sub.2 Ni particles 300 .mu.m or finer in size dispersed uniformly at the rate of at least 10,000 particles per square millimeter of the anode surface area, whereby the growth of a passive state film is prevented.

Insoluble anodes for producing manganese dioxide consisting essentially

A method of producing an anode material for electrolytic use comprises heat-treating a titanium alloy which consists of 0.1-10 wt % of nickel and the remainder of titanium and unavoidable impurities and which has been thermally affected above its beta transformation point, at a temperature of 400.degree.-800.degree. C. during the process. Alternatively, the alloy is cold-rolled to a working degree of at least 10 percent prior to the heat treatment. The anode material is made to have a surface roughness, Rmax, of at least 100 .mu.m, a yield strength of at least 30 kgf/mm.sup.2, a Vickers hardness of at least 150, and a flatness of at most 6 mm per meter.

Method of producing anode materials for electrolytic uses

A process for producing a titanium material with excellent corrosion resistance, which comprises first applying a degree of cold working of 10% or more of the total working reduction while causing an oil to exist on the surface of the titanium material during cold working thereof and then subjecting the titanium material to in-situ heat treatment at a temperature of 300.degree. C. or higher, thereby forming a layer with excellent corrosion resistance containing at least one of Ti.sub.2 N, TiC and Ti(CN) on the titanium material surface.

In-process formation of hard surface layer on Ti/Ti alloy having high

An excellently corrosion-resistant titanium-base alloy comprises, all by weight, either from 0.005% to less than 0.2% ruthenium or from 0.005% to 2.0% palladium or both, at least one of from 0.01% to 2.0% nickel, from 0.005% to 0.5% tungsten, and from 0.01% to 1.0% molybdenum, and the remainder titanium and unavoidable impurities.

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Kanagawa, Japan

Kazuhiro Taki