公开(公告)号：US07217327B2

公开(公告)日：2007-05-15

申请号：US10651978

申请日：2003-09-02

申请人： Hiroshi Eiraku ,  Yutaka Sawano ,  Tetsuya Yamamura ,  Kuniji Yashiro ,  Fumihide Nakamura ,  Motohiro Tenmaya

发明人： Hiroshi Eiraku ,  Yutaka Sawano ,  Tetsuya Yamamura ,  Kuniji Yashiro ,  Fumihide Nakamura ,  Motohiro Tenmaya

IPC分类号： C23C18/54 ,  C23C18/16

CPC分类号： C23C8/52

摘要： A metal member is produced with enhanced corrosion resistance by salt bath nitriding. Specifically, in a nitriding salt bath containing Li+, Na+ and K+ ions as cation components and CNO− and CO3−− ions as anion components and enhanced in oxidizing power by addition of an oxidizing-power-enhancing substance selected from the group consisting of alkali metal hydroxides, bound water, free water and moist air, the metal member is immersed such that an nitrided layer is formed on a surface of the metal member and concurrently, an oxide film is formed on an outermost layer of the nitrided layer. As a subsequent step to the immersion in the nitriding salt bath, the metal member is immersed in a displacement cleansing salt bath which contains an alkali metal nitrate.

摘要翻译： 通过盐浴氮化生产具有增强的耐腐蚀性的金属构件。 具体地说，在含有Li +，Na +和K +离子的氮化盐浴中作为阳离子成分和CNO - 和作为阴离子成分的CO 3离子，并通过加入选自碱金属氢氧化物的氧化强度增强物质加强氧化能力，结合 水，自由水和潮湿空气中浸入金属构件，使得在金属构件的表面上形成氮化层，同时在氮化层的最外层形成氧化膜。 作为浸入氮化盐浴的后续步骤，将金属构件浸入含有碱金属硝酸盐的置换清洗盐浴中。

公开(公告)号：US20070204934A1

公开(公告)日：2007-09-06

申请号：US10586626

申请日：2005-01-19

申请人： Kaoru Hoshino ,  Makoto Miyashita ,  Takashi Kawamura ,  Toshiko Totsuka ,  Hiroshi Eiraku ,  Kuniji Yashiro ,  Takumi Kurosawa

发明人： Kaoru Hoshino ,  Makoto Miyashita ,  Takashi Kawamura ,  Toshiko Totsuka ,  Hiroshi Eiraku ,  Kuniji Yashiro ,  Takumi Kurosawa

IPC分类号： C23C22/00

CPC分类号： C23C8/02

摘要： A passivated film on a surface of a high-alloy steel member makes it difficult to apply diffusion treatment, such as gas nitriding or gas carburizing, that forms a nitrided layer, carburized layer or carbonitrided layer on the surface of the steel member. An activating treatment method is provided for the surface of the metal member. This method is not accompanied by problems of conventional activation treatment with a halide, such as furnace deposits, furnace wall erosion and effluent gas detoxification treatment, and is useful as pretreatment for diffusion treatment. According to this method, the passivated surface of the high-alloy steel member can be activated by using a gas commonly employed in gas heat treatment, and forming HCN gas in a heating furnace while making use of catalytic action of the steel member or a surface of the furnace.

摘要翻译： 在高合金钢构件的表面上的钝化膜难以在钢构件的表面上形成氮化层，渗碳层或碳氮共渗层的扩散处理，例如气体氮化或气体渗碳。 为金属构件的表面提供激活处理方法。 这种方法不伴随常规的卤化物活化处理，如炉渣，炉壁侵蚀，排气解毒处理等问题，可作为扩散处理的预处理。 根据该方法，可以通过使用通常用于气体热处理的气体，并且在加热炉中形成HCN气体同时利用钢构件或表面的催化作用来激活高合金钢构件的钝化表面 的炉子。

公开(公告)号：US07238244B2

公开(公告)日：2007-07-03

申请号：US10416710

申请日：2001-11-28

申请人： Tokuo Sato ,  Yutaka Sawano ,  Tetsuya Yamamura ,  Kazuyoshi Kurosawa ,  Humihide Nakamura ,  Motohiro Tenmaya

发明人： Tokuo Sato ,  Yutaka Sawano ,  Tetsuya Yamamura ,  Kazuyoshi Kurosawa ,  Humihide Nakamura ,  Motohiro Tenmaya

IPC分类号： C23C8/50

CPC分类号： C23C8/50 ,  C23C8/52

摘要： A new nitriding process by using a salt bath to produce iron and steel parts having excellent abrasion resistance and corrosion resistance includes forming an iron lithium complex oxide layer at the outermost surface of the iron part by immersing the iron and steel parts in a salt bath containing cationic component of Li, Na and K and anionic components of CNO−and CO32−, where hydroxide compound selected from lithium hydroxide, sodium hydroxide and potassium hydroxide are added to the salt bath. Materials being in a hydrated state or in a free water containing state can be used for preparation or replenishing of the salt bath. Moistened air of (1×10−2 kg·H2O)/(1 kg dry air) can be used for mixing the salt bath. Containing ratio of Li, Na, K is preferable where a solidifying temperature of the mixture of carbonates of Li, Na, K in that ratio is lower than 500° C. It is preferable that the mol ratio of Na and K is to be 2:8˜8:2, the content of CNO− is to be 5˜35 wt %, the content of CN− in the salt bath is less than 2 wt % and the temperature of the salt bath is to be 450˜650° C.

摘要翻译： 通过使用盐浴来生产具有优异的耐磨性和耐腐蚀性的钢铁部件的新的氮化方法包括在铁部件的最外表面上形成铁锂复合氧化物层，将铁和钢部件浸入含有 Li，Na和K的阳离子成分和CNO - 和SO 3 - 2 - 的阴离子组分，其中选自氢氧化锂，钠 将氢氧化物和氢氧化钾加入到盐浴中。 处于水合状态或自由含水状态的材料可用于制备或补充盐浴。 可以使用（1×10 -2 -2.H 2 O）/（1kg干燥空气）的润湿空气来混合盐浴。 当Li，Na，K的碳酸盐混合物的固化温度低于500℃时，优选Li，Na，K的含有比例。Na和K的摩尔比优选为2 ：8〜8：2，CNO 的含量为5〜35重量％，盐浴中CN 的含量小于2重量％ 盐浴的温度为450〜650℃。

公开(公告)号：US20040040630A1

公开(公告)日：2004-03-04

申请号：US10651978

申请日：2003-09-02

申请人： PARKER NETSUSHORI KOGYO K.K. ,  Nihon Parkerizing Co., Ltd.

发明人： Hiroshi Eiraku ,  Yutaka Sawano ,  Tetsuya Yamamura ,  Kuniji Yashiro ,  Fumihide Nakamura ,  Motohiro Tenmaya

IPC分类号： C23C008/34

CPC分类号： C23C8/52

摘要： A metal member is produced with enhanced corrosion resistance by salt bath nitriding. Specifically, in a nitriding salt bath containing Linull, Nanull and Knull ions as cation components and CNOnull and CO3nullnull ions as anion components and enhanced in oxidizing power by addition of an oxidizing-power-enhancing substance selected from the group consisting of alkali metal hydroxides, bound water, free water and moist air, the metal member is immersed such that an nitrided layer is formed on a surface of the metal member and concurrently, an oxide film is formed on an outermost layer of the nitrided layer. As a subsequent step to the immersion in the nitriding salt bath, the metal member is immersed in a displacement cleansing salt bath which contains an alkali metal nitrate.

摘要翻译： 通过盐浴氮化生产具有增强的耐腐蚀性的金属构件。 具体地说，在含有Li +，Na +和K +离子作为阳离子成分和CNO - 和CO 3 - 离子作为阴离子成分的氮化盐浴中，通过加入 选自由碱金属氢氧化物，结合水，游离水和潮湿空气组成的组的氧化强度增强物质，浸渍金属构件，使得在金属构件的表面上形成氮化层，同时，氧化膜 形成在氮化层的最外层上。 作为浸入氮化盐浴的后续步骤，将金属构件浸入含有碱金属硝酸盐的置换清洗盐浴中。