• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
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    • 专利摘要:

    公开号:SE0950090A1
    申请号:SE0950090
    申请日:2009-02-19
    公开日:2010-08-13
    发明作者:Alena Nordqvist
    申请人:Seco Tools Ab；
    IPC主号:
    专利说明:

    15 20 25 30 2 This is not a problem in use, as most tools are not handled as much, but can possibly be a problem in set-up rooms and during assembly in production. A European standard, SS EN 181 1 + A1: 2008, for products in prolonged contact with skin has been adopted. This European Standard specifies a method for simulating the release of nickel from articles intended to come into direct and prolonged contact with skin to determine whether such articles release nickel at a rate greater than 0.5 u g / cmz / week. The amount of nickel solution in sweat samples from chemical nickel layers varies a lot depending on process parameters and the phosphorus content, usually between 3-12 u g / cmz / week. This variation is observed for the same supplier from batch to batch. It is known that electrolytic nickel coatings provide less resolution, 1-2 μg / cm 2 / week, and nickel metal even less. The reason for this is that chemical nickel is more amorphous in nature and therefore more sensitive.
    The electrolytic nickel is crystalline. The reason for choosing chemical nickel for tools is that it is evenly distributed on the surface, while electrolytic nickel is preferably formed on outwardly facing surfaces. This could cause serious problems for the precision of the cutting seats.
    The above standard is not intended for cutting tools, but it is of course also desirable for the cutting tool industry to adhere to it to be sure that no liability can arise.
    There is also a great desire from many customers to join this to meet their environmental needs.
    It is therefore an object of the present invention to provide a Ni coating which complies with the SS-EN18 11 l standard.
    It is a further object to provide a method of manufacturing a Ni coating which meets the SS-EN 1 8 1 l standard.
    Fig. 1 shows a scanning electron microscope image of a fracture surface of a coating according to the invention where A is substrate, B electrolytic nickel layer, C chemical nickel layer and D electrolytic nickel layer.
    According to the present invention, it has surprisingly been found that by using a final cleaning of an electrolytic top layer, the requirements of the SS-EN-1811 standard can be met.
    More specifically, the coating according to the present invention comprises or consists of - a first inner layer of electrolytically precipitated Ni with a thickness of 0.1-1 μm, - a second chemically precipitated nickel layer, preferably with a phosphorus content of 4-12% by weight, preferably 6-10% by weight, and a thickness of> 2 μm, preferably> 3 μm (the layer is preferably thinner than 5 μm and not thicker than 10 μm) and - an outer layer of electrolytically precipitated N i, (preferably of crystalline structure) with a thickness of 0.1-2 μm and with a Ni resolution of less than 0.5 ug / cmz / week determined according to SS EN 1811 + A1: 2008. The method of the present invention comprises the following steps apart from conventional cleaning steps: Deposition of a nickel layer on the body using electrolytic methods and finally, treatment of the layer with electrolytic passivation to obtain a Ni solution below 0.5 pg / cmz / week determined according to SS EN 1811 + A1: 2008.
    In a preferred embodiment, the method may comprise the step of precipitating between the body and the electrolytic nickel layer a first inner layer of Ni using electrolytic methods and then a second nickel layer using chemical methods.
    In a second preferred embodiment, the method may comprise the steps of precipitating A. Precipitation of a first inner layer of crystalline Ni with a thickness of 0.1-1 μm using an electrolytic method, preferably in a solution of nickel chloride 50 - 65 g Ni / 1 and hydrochloric acid 70 - 80 g HCl / 1 at a current density of 2 - 5 A / dmz, a voltage of 3 - 5 V for 30 - 60 s.
    B. Precipitation of a second nickel layer with a phosphorus content of 6 ~ 10% by weight and a thickness of> 2 μm, preferably> 3 but preferably <5 μm using a chemical method also called electroless coating using a bath known in the technique e.g. using Niklad 805 ELV supplied by Macdermid Inc for 12-15 min.
    Precipitation of a third or outer layer of crystalline Ni with a thickness of 0.1-2 μm, preferably 0.1-1 μm, using an electrolytic method, preferably in a solution of nickel chloride 50 - 65 g Ni / 1 and hydrochloric acid 70 - 80 g HCl / l at a current density of 2 A / dmz, a voltage of 2 - 3 Vi 180 s.
    D. Electrolytic passivation as known in the art eg performed in Alcaline Cleaner Metex LC100 provided by Macdermid Inc at a concentration of 100 - 120 ml / l, a temperature of 65 ° C - 90 ° C and a voltage of 4.5 V for 180 s to obtain a substantially non-reactive surface film which at least partially covers the outer layer of electrolytically precipitated Ni.
    Example 1 Steel cylinders diameter 20 mm and height 10 mm were provided with an N i coating according to the invention according to the following procedure in addition to conventional cleaning steps: 1. Coating with a 0.5 μm electrolytic nickel layer in a solution of nickel chloride 60 g Ni / l and hydrochloric acid 75 g HCl / l at a current density of 3 A / dmz, a voltage of 4 V for 50 s. 2. Coating with 4 μm chemical nickel layer in a Niklad 805 ELV bath provided by Macdermid Inc for 13 min. Step 1 was repeated at a current density of 2 A / dmz, a voltage of 3 V for 180 s. ° C and a voltage of 4.5 V for 180 s.
    The coating was studied in a scanning electron microscope. Fig. 1 is a secondary electron image where A is substrate, B electrolytic nickel layer, C chemical nickel layer and D electrolytic nickel layer. The phosphorus content in layer C was about 5% by weight.
    Three coated cylinders were subjected to a dissolution test according to the SS-EN1 81 l standard.
    The following results were obtained: 1 2 3 u g Ni 0.2 0.1 0.2 It is clear that the result meets the SS-ENl 81 l standard.
    Example 2 Example 1 was repeated except for step 4. The following results were obtained: 1 2 3 u g Ni 0.6 0.8 0.5 The result is clearly outside the standard.
    Example 3 Example 1 was repeated except for steps 3 and 4. The measurements were thus performed on the chemical nickel layer with the following results: 1 2 3 pg Ni 7 7.8 8.2 The nickel solution is clearly outside the standard.
    Example 4 Commercially available milling tools from competitors were tested with the following results in Ni: Competitor Sample 1 Sample 2 Sample 3 1 0.7 9.0 2.5 2 6 14.2 12.5 3 12.6 19.4 --- The nickel resolution is clearly outside the standard and shows a large spread.
    权利要求:
    Claims (5)
    [1]
    A steel cutting tool with a coating, characterized in that the coating consists of: - a first, inner layer of electrolytically precipitated Ni with a thickness of 0.1-1 μm, - a second layer of chemically precipitated Ni and - an outer layer of electrolytically precipitated Ni with a thickness of 0.1-2 μm, this outer nickel layer being at least partially covered by an electrolytically produced passivation layer, the coating having a Ni resolution of less than 0.5 pg / cm 2 / week determined according to SS EN 181l + A1: 2008.
    [2]
    The nickel-plated cutting tool according to claim 1, characterized in that the outer layer of electrolytically precipitated Ni has a thickness of 0.1-1 μm.
    [3]
    The nickel-plated cutting tool according to claim 1, characterized in that the second chemically deposited nickel layer has a phosphorus content of 4-12% by weight and a thickness of> 2 μm, preferably turmeric than 10 μm.
    [4]
    The nickel-plated cutting tool according to claim 3, characterized in that the second chemically precipitated nickel layer has a phosphorus content of 6-10% by weight and a thickness of> 2 μm, preferably thinner than 5 μm.
    [5]
    5. A method of making a nickel-plated cutting tool of steel characterized by depositing on the tool - electrolytically a first, inner layer of Ni with a thickness of 0.1-1 μm, - chemically a second nickel layer, - electrolytically a third outer layer of Ni with a thickness of 0.1-2 μm and then - passivating electrolytically in an alkaline solution at a temperature of 65 ° C - 90 ° C and a voltage of 4.5 V for 180 s to obtain a substantially non-alkaline -reactive surface film that at least partially covers the outer layer of electrolytically precipitated Ni to obtain a Ni resolution of less than 0.5 pg / cmz / week determined according to SS EN 1811 + A1: 2008.
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    同族专利:
    公开号 | 公开日
    SE533795C2|2011-01-18|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2014-09-30| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    SE0900171|2009-02-12|
    SE0950090A|SE533795C2|2009-02-12|2009-02-19|Nickel-coated steel cutting tools and ways to manufacture them|SE0950090A| SE533795C2|2009-02-12|2009-02-19|Nickel-coated steel cutting tools and ways to manufacture them|
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