JP6651256B2 - Method of plating faucet fittings and faucet fittings made of copper alloy - Google Patents
Method of plating faucet fittings and faucet fittings made of copper alloy Download PDFInfo
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- JP6651256B2 JP6651256B2 JP2016090393A JP2016090393A JP6651256B2 JP 6651256 B2 JP6651256 B2 JP 6651256B2 JP 2016090393 A JP2016090393 A JP 2016090393A JP 2016090393 A JP2016090393 A JP 2016090393A JP 6651256 B2 JP6651256 B2 JP 6651256B2
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Description
本発明は、水栓金具のめっき方法及び銅合金製の水栓金具に関するものである。 The present invention relates to a faucet plating method and a faucet made of copper alloy.
従来から、例えば洗濯機で使用される単水栓や、例えば流し台、洗面台、浴槽等で使用される湯水混合水栓等の水栓金具は、一般に、青銅、黄銅等の銅合金を鋳造又は鍛造し、切削加工、研磨加工等で形状を整えた後、ニッケルクロムめっき等を施して製造されている。そして、製造過程中での切削加工の際に銅合金の切削性を向上させるため銅合金中に鉛が添加されている。 Conventionally, for example, a single faucet used in a washing machine, and a faucet fitting such as a hot-water mixing faucet used in, for example, a sink, a wash basin, a bathtub, etc., are generally made of a copper alloy such as bronze and brass. It is manufactured by forging, shaping, shaping, or the like, and then applying nickel chrome plating or the like. Then, lead is added to the copper alloy in order to improve the machinability of the copper alloy during the cutting process during the manufacturing process.
下記特許文献１には、アルカリ系のエッチング液に浸漬するなどの特有の構成によって鉛含有銅合金製水栓金具から規制対象物質の鉛が溶出することを防止する鉛含有銅合金製水道用器具が開示されている。 Patent Literature 1 below discloses a lead-containing copper alloy water tool that prevents the regulated substance, lead, from eluting from a lead-containing copper alloy faucet fitting by a specific configuration such as immersion in an alkaline etching solution. Is disclosed.
しかしながら、特許文献１に記載されている水道用器具においては、鉛除去乃至鉛フリー（ＮＰｂ）表面処理技術により銅合金表面の鉛を除去し、製品からの鉛の溶出を低減することは可能になるけれども、以下に示すような課題がある。（１）ＮＰｂ処理された水道用器具の表面の光沢性を向上させて美観を醸しだすため、ニッケルめっき、クロムめっきを施す場合においてはニッケルが微量ではあるが通水中に溶出することになる。（２）そこで、ニッケルの浸出を抑えるためにコーティング技術を採用した場合においては、そのコーティング処理が水栓金具の外観に影響を及ぼすといった課題、すなわち、虹色で表面がまだらになり外観が損なわれるといった課題がある上に、水栓金具の内面にコーティング剤が行き渡らないこともあるといった課題がある。 However, in the water supply device described in Patent Literature 1, it is possible to remove lead from the copper alloy surface by a lead removal or lead-free (NPb) surface treatment technology, thereby reducing the elution of lead from the product. However, there are the following issues. (1) NPb improve the gloss of the treated surface of the water for instruments for out brew aesthetics, nickel plating, it is the nickel is trace amount eluted in passing water when performing-out chromium plating become. (2) Therefore, when employing the coating technique in order to suppress the leaching of nickel is a problem that the coating process affects the appearance of the water faucets, i.e., the surface in iridescent appearance becomes mottled In addition to the problem that the coating agent is damaged, there is also a problem that the coating agent may not reach the inner surface of the faucet fitting.
本発明は上述の事柄を考慮に入れてなされたものであり、銅合金製の水栓金具において、ニッケル及び鉛の溶出（浸出）を抑制できる水栓金具のめっき方法及び銅合金製の水栓金具を提供することを目的としている。 The present invention has been made in view of the above-described circumstances, and in a copper alloy faucet, a plating method of the faucet capable of suppressing the elution (leaching) of nickel and lead, and a copper alloy faucet It is intended to provide metal fittings.
上記目的を達成するため、本願の請求項１に係る発明は、鉛が添加されている銅合金製の水栓金具に対し鉛を除去する鉛除去工程を施し、その後、この銅合金製水栓金具に対し、ニッケルめっき、クロムめっき、および還元型の無電解錫めっきを行う工程を順次施す水栓金具のめっき方法であって、前記銅合金製水栓金具の通水管部内において、銅合金層にニッケルめっき層を付着させ、そのニッケルめっき層にクロムめっき層を付着させ、さらに、そのクロムめっき層に還元型の無電解錫めっき層を形成する水栓金具のめっき方法を提供する。本発明において還元型の無電解錫めっきを行うにあたり、用いるめっき液は公知のものが使用される。そして、例えば、めっき液の寿命を長くしたり、めっき液の主成分の一つである還元剤の効率を良くするため補助成分を添加してもよく、また、用いるめっき槽を内槽と外槽の二重槽で構成してもよく、さらに、この二重槽による間接加熱を行ってもよく、内槽と外槽の温度制御する手段を設けてもよい。 To achieve the above object, the invention according to a first aspect of the present invention, subjected to a lead removal step of removing the lead against the copper alloy faucet fittings being added lead, then copper alloy faucet to fitting, nickel plating, chromium plating, and a plating method of sequentially applying faucet a step of performing electroless tin plating of reduced, in the water pipe portion of the copper alloy faucets, copper alloy layer the deposited nickel plating layer, the nickel plating layer is deposited chromium plating layer, further, that it provides a plating method faucet forming the electroless tin plating layer of reduced to the chromium plating layer. In performing the reduction type electroless tin plating in the present invention, a known plating solution is used. Then, for example, an auxiliary component may be added to extend the life of the plating solution or to improve the efficiency of the reducing agent, which is one of the main components of the plating solution. It may be constituted by a double tank, and furthermore, indirect heating may be performed by the double tank, and means for controlling the temperature of the inner tank and the outer tank may be provided.
別の観点から、本願の請求項２に係る発明は、ニッケルめっき層およびクロムめっき層を有する銅合金製の水栓金具であって、その銅合金製水栓金具の通水管部内において、銅合金層に付着したニッケルめっき層、そのニッケルめっき層に付着したクロムめっき層、さらに、そのクロムめっき層に形成された還元型の無電解錫めっき層を備えてなる銅合金製の水栓金具を提供する。 From another viewpoint, the invention according to claim 2 of the present application is a copper alloy faucet having a nickel plating layer and a chromium plating layer, wherein the copper alloy faucet has a copper alloy faucet inside a water pipe portion thereof. Provided is a copper alloy water faucet comprising a nickel plating layer adhered to a layer , a chromium plating layer adhered to the nickel plating layer, and a reduction type electroless tin plating layer formed on the chromium plating layer. I do.
なお、本発明における水栓金具とは、単水栓や湯水混合水栓のみならず、水流路の一部を形成しうる配管部品・継手部品・バルブ等の水道用品等をも意味する。 In addition, the faucet fitting in the present invention means not only a single faucet and a hot and cold water faucet but also a plumbing part, a joint part, a water supply such as a valve which can form a part of a water flow path, and the like.
本発明は、ニッケルめっき層およびクロムめっき層を有する銅合金製の水栓金具であって、さらに、還元型の無電解錫めっき層を備えている。すなわち、例えば給水配管の下流に連通する単水栓の通水管部内において、銅合金層に付着したニッケルめっき層、そのニッケルめっき層に付着したクロムめっき層を備えており、さらに、そのクロムめっき層を覆う一様の厚さの還元型の無電解錫めっき層を形成でき、この無電解錫めっきのコーティングによって、ニッケルの溶出（浸出）を抑制できる。 The present invention is a copper alloy faucet having a nickel plating layer and a chromium plating layer, and further includes a reduction type electroless tin plating layer. That is, for example, in the water pipe section of the single faucet communicating downstream of the water supply pipe, a nickel plating layer adhered to the copper alloy layer , a chromium plating layer adhered to the nickel plating layer is provided, and the chromium plating layer is further provided. the can form an electroless tin plating layer of the reduced form of uniform thickness covering, the coating of the electroless tin plating, can be suppressed elution of nickel (leaching).
また、本発明では、前記銅合金として、鉛が添加されているものを用い、前記ニッケルめっき、クロムめっきを行う工程の前段に鉛を除去する鉛除去工程、例えばアルカリ系のエッチング液に浸漬する工程を採用することにより、鉛除去乃至鉛フリ−の銅合金製水栓金具をうることができ、その後、この銅合金製水栓金具に対し、前記ニッケルめっき、クロムめっき及び還元型の無電解錫めっきを順次行うことで、ニッケルの溶出（浸出）を抑制できる。 In the present invention, the copper alloy to which lead is added is used, and the nickel plating and the chromium plating are immersed in a lead removal step of removing lead before the step of performing the plating, for example, an alkaline etching solution. By adopting the process, a lead-free or lead-free copper alloy faucet can be obtained, and then the nickel- plated, chromium-plated and reduction-type electroless electroplating can be performed on the copper alloy faucet. By sequentially performing tin plating, elution (leaching) of nickel can be suppressed.
以下、本発明の実施形態について説明する。なお、それによって本発明は限定されるものではない。図１は、水栓金具のめっき方法の手順の一実施形態を示している。図２は、前記実施形態で用いられる還元型の無電解錫めっき槽を示している。 Hereinafter, embodiments of the present invention will be described. The present invention is not limited thereby. FIG. 1 shows an embodiment of a procedure of a plating method of a faucet fitting. FIG. 2 shows a reduction type electroless tin plating tank used in the embodiment.
この実施形態では、鉛含有銅合金製の水栓金具に前記無電解錫めっきを施すため、図１において、例えば鉛含有銅合金を鋳造し、バフ研磨をして所定形状に整形された水栓金具を得るとともに、バフ研磨後に生じたカスを除去槽に漬けて除去する工程１（ステップ１）と、水栓金具をアルカリ性の溶液槽に漬けて金属表面の鉛等を除去する工程（ＮＰｂ処理工程）２（ステップ２）と、水栓金具を、ニッケル槽に漬けてニッケルを付着するニッケル付着工程３（ステップ３）及びクロム槽に漬けてクロムを付着するクロム付着工程４（ステップ４）により、ニッケルめっき、クロムめっきを施して銅合金層に付着したニッケルめっき層、そのニッケルめっき層に付着したクロムめっき層を備えてなる水栓金具を得るようにし、さらに、ニッケルめっきおよびクロムめっきを施した銅合金製の水栓金具の前処理工程５（ステップ５）と、前処理工程を終了した、ニッケルめっきおよびクロムめっきを施した銅合金製の水栓金具を還元型の無電解錫めっき層に漬けてニッケルの溶出（浸出）を抑制する工程６（ステップ６）とを主として有している。 Faucet In this embodiment, for performing the electroless tin plating faucet fittings made of lead-containing copper alloy, in FIG. 1, which is cast, for example, lead-containing copper alloy, is shaped into a predetermined shape by a buffing Step 1 (Step 1) of obtaining metal fittings and immersing scum generated after buffing in a removing tank, and a step of immersing faucet fittings in an alkaline solution tank to remove lead and the like on the metal surface (NPb treatment) Step 2) (Step 2), a faucet fitting in a nickel bath and a nickel attaching process 3 (Step 3) for attaching nickel, and a chrome attaching process for attaching a chromium in a chromium bath and attaching chromium 4 (Step 4). , nickel plating, nickel plating layer deposited on the copper alloy layer is subjected to chrome plating, so as to obtain a water faucet fittings made includes a chrome plating layer attached to the nickel-plated layer, and further, nickel Pretreatment step plating and chrome plating-out copper alloy faucet fittings subjected 5 (step 5), the pretreatment step has ended, copper alloy faucet subjected to-out nickel plating and chrome plating Step 6 (Step 6) of suppressing the elution (leaching) of nickel by immersing the metal fitting in a reduction-type electroless tin plating layer.
図２において、還元型の無電解錫めっき槽１１は、内槽１２と外槽１３の二重槽で構成されている。また、めっき液１４の寿命を長くしたり、めっき液１４の主成分の一つである還元剤の効率を良くするためにめっき槽１１内には補助成分（図示せず）が添加されている。補助成分としては、例えば、めっき液１４のｐＨ調整剤、ｐＨの変動を抑える緩衝剤、めっき液１４の安定性を向上させる錯化剤、めっき液１４の自然分解を抑える安定剤、及び光沢を与える改良剤を挙げることができる。また、めっき液１４の温度は内槽１２と外槽１３の温度制御する手段により適宜制御されている。また、ニッケルめっきおよびクロムめっきを施した銅合金製の水栓金具の浸漬時間も温度制御する手段と同様に集中制御盤（図示せず）によって適宜制御されている。なお、この実施形態では、「ニッケルめっきおよびクロムめっきを行う工程」と「還元型の無電解錫めっきを行う工程」との間にステップ５の前処理工程が施されている。また、「残存する鉛を除去するための特殊エッチング液に前記ステップ２でＮＰｂ処理された水栓金具を浸漬させる工程」が、ステップ２とステップ３の間に設けられている。
In FIG. 2, a reduction type electroless tin plating tank 11 is constituted by a double tank of an
而して、水栓金具の銅合金として、鉛が添加されているものを用い、ニッケルめっきおよびクロムめっきを行う工程の前段に鉛を除去する鉛除去工程を含むことにより、鉛除去工程として例えばアルカリ系のエッチング液に浸漬する工程を採用することにより、鉛除去乃至鉛フリ−の銅合金製水栓金具をうることができ、その後、この銅合金製水栓金具に対し、前記ニッケルめっき、クロムめっき及び還元型の無電解錫めっきを順次行うことで、銅合金層に付着したニッケルめっき層、そのニッケルめっき層に付着したクロムめっき層を備えている水栓金具において、ニッケルの溶出（浸出）を抑制できる。 Thus, as the copper alloy of the faucet fitting, a lead-added one is used, and a lead removal step of removing lead is provided before the step of performing nickel plating and chromium plating. By adopting a step of immersion in an alkaline etching solution, a lead-free or lead-free copper alloy faucet can be obtained, and then the nickel plating is performed on the copper alloy faucet . Nickel elution (leaching) occurs in the nickel plating layer adhered to the copper alloy layer and the faucet fitting provided with the chromium plating layer adhered to the nickel plating layer by sequentially performing chromium plating and reduction type electroless tin plating. ) Can be suppressed.
３，４ ニッケルめっき、クロムめっきを行う工程
６ 還元型の無電解錫めっきを行う工程
3,4 Step of performing nickel plating and chrome plating 6Step of performing reduction type electroless tin plating
Claims (2)
A copper alloy faucet having a nickel plating layer and a chromium plating layer, wherein a nickel plating layer adhered to the copper alloy layer and adhered to the nickel plating layer in a water pipe portion of the copper alloy faucet . A copper alloy faucet comprising a chromium plating layer and a reduction type electroless tin plating layer formed on the chromium plating layer .
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