JP2009280896A

JP2009280896A - Pipe joint

Info

Publication number: JP2009280896A
Application number: JP2008176306A
Authority: JP
Inventors: Atsuo Suehiro; 篤夫末廣; Haruhiko Tsunoda; 治彦角田; Toshihiko Morooka; 俊彦諸岡
Original assignee: Koyo Seiko Co Ltd; Kowa Kogyo Co Ltd
Current assignee: Koyo Seiko Co Ltd; Kowa Kogyo Co Ltd
Priority date: 2008-05-23
Filing date: 2008-05-23
Publication date: 2009-12-03

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe joint subjected to non-toxic hot dip zinc plating, to provide a pipe joint subjected to a non-toxic zinc alloy plating having corrosion resistance more excellent than that of the present hot dip zinc plating, and, in the case it is preferable that a plating method and equipment are limited, to make clear the method. <P>SOLUTION: Using toxic substance-free zinc, hot dip zinc plating or hot zinc-aluminum based alloy plating is performed. As the plating furnace, the one free from the generation of dross is used. In the case of the zinc-aluminum based alloy plating, two furnaces are used, hot dip galvanizing is performed in the first furnace, and hot dip zinc-aluminum based alloy plating is performed in the second furnace. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、配管用の管継手に属す。管継手の表面処理は、溶融亜鉛めっきに属す。 The present invention belongs to a pipe joint for piping. The surface treatment of pipe joints belongs to hot dip galvanizing.

管継手は、耐食性を付与するために溶融亜鉛めっきを使うが、従来の溶融亜鉛めっきでは対応できない問題が生じてきた。即ち、環境負荷物質の低減要求から鉛、カドミウムなどの毒性物質を含まない溶融亜鉛めっきが必要、海水がかかるような環境では、より優れた耐食性がある溶融亜鉛系めっきが必要などである。 Pipe joints use hot dip galvanizing to impart corrosion resistance, but problems that cannot be addressed by conventional hot dip galvanizing have arisen. That is, hot dip galvanizing that does not contain toxic substances such as lead and cadmium is required because of the demand for reducing environmentally hazardous substances, and hot dip galvanizing with better corrosion resistance is required in an environment where seawater is applied.

従来の溶融亜鉛めっきは鉄製の釜／炉を使用しているが、次ぎのような問題があった。即ち、炉を保護するために鉛を使用するので、めっきに鉛が含まれてしまう、炉が亜鉛に侵食され寿命が短くなるばかりでなく、侵食された鉄分が亜鉛と反応してドロスになり、亜鉛の消費量を増大させ、めっき不良の原因になる。 Conventional hot dip galvanization uses an iron kettle / furnace, but has the following problems. That is, since lead is used to protect the furnace, lead is contained in the plating, the furnace is not only eroded by zinc and the life is shortened, but the eroded iron reacts with zinc and becomes dross. This increases zinc consumption and causes plating defects.

毒性のない溶融亜鉛めっきをした管継手を得ること、及び、現在の溶融亜鉛めっきより優れた耐食性の毒性のない亜鉛合金をめっきした管継手を得ること。めっき方法や設備を限定した方がよい場合は、その方法を明らかにすること。 To obtain a non-toxic hot-dip galvanized pipe joint and to obtain a non-toxic zinc alloy-plated pipe joint superior to current hot-dip galvanizing. If it is better to limit the plating method and equipment, clarify the method.

毒性物質を含まない亜鉛を使い、溶融亜鉛めっき又は溶融亜鉛−アルミニウム系合金めっきをする。めっき炉はドロスを発生しない炉にする。亜鉛−アルミニウム系合金めっきの場合は炉を２基使い、最初の炉で溶融亜鉛めっきをし、次ぎの炉で溶融亜鉛−アルミニウム系合金めっきをする。 Use zinc that does not contain toxic substances, and perform hot dip galvanization or hot dip zinc-aluminum alloy plating. The plating furnace should be a furnace that does not generate dross. In the case of zinc-aluminum alloy plating, two furnaces are used, hot-dip galvanizing is performed in the first furnace, and hot-dip zinc-aluminum alloy plating is performed in the next furnace.

毒性のない溶融亜鉛めっき及び優れた耐食性の毒性のない亜鉛−アルミニウム合金をめっきした管継手を提供できる。 A non-toxic hot dip galvanizing and an excellent corrosion resistance non-toxic zinc-aluminum alloy plated pipe joint can be provided.

従来使用している溶融亜鉛めっきの地金は蒸留亜鉛地金１種であるが、これを最純亜鉛地金又は特殊亜鉛地金に変えて、溶融亜鉛めっき又は溶融亜鉛−アルミニウム系合金めっきをする。 The hot-dip galvanized metal used in the past is one kind of distilled zinc metal, but this is replaced with the purest zinc metal or special zinc metal, and hot-dip galvanized or hot-dip zinc-aluminum alloy plating is used. To do.

めっき炉はセラミック製にしてドロスの発生をなくす。溶融亜鉛めっきは、炉を変えた以外は従来と同じ工程で管継手をめっきする。溶融亜鉛アルミニウム系合金のめっきは、溶融亜鉛めっき後亜鉛−アルミニウム系合金の炉に浸漬してめっきするが、最初の亜鉛のめっき層は、溶融亜鉛合金めっきのフラックスの役目をしている。 The plating furnace should be made of ceramic to eliminate dross generation. In hot dip galvanizing, pipe joints are plated in the same process as before except that the furnace is changed. Hot-dip galvanized aluminum alloy plating is performed by hot-dip galvanizing and dipping in a zinc-aluminum-based alloy furnace. The first zinc plating layer serves as a flux for hot-dip zinc alloy plating.

セラミック炉はアルミナ系材料で造り、亜鉛は最純度亜鉛又は特殊亜鉛地金を、亜鉛−アルミニウム系合金は５％Ａｌ−Ｚｎ又は５％Ａｌ−１％Ｍｇ−Ｚｎを用い、配管用継手類のめっきを上述の方法で行なった。その結果、ドロスの発生が被めっき材以外になく、良好なめっきが能率的にできることを確認した。 The ceramic furnace is made of alumina material, zinc is the purest zinc or special zinc metal, and zinc-aluminum alloy is 5% Al-Zn or 5% Al-1% Mg-Zn. Plating was performed by the method described above. As a result, it was confirmed that dross was not generated except for the material to be plated, and good plating could be efficiently performed.

全工程の中で次ぎのことが重要であることを確認した。大気中では、溶融亜鉛めっきにはフラックス処理が不可欠である。溶融亜鉛めっきを抜いて、溶融亜鉛−アルミニウム系合金めっきはできない。 The following things were confirmed to be important in the whole process. In the atmosphere, flux treatment is indispensable for hot dip galvanizing. The hot dip galvanization is removed, and hot dip galvanized aluminum alloy plating cannot be performed.

この管継手は、環境負荷物質の低減のために使われる。塩害の心配のある配管、塗装や樹脂コーティングでは使えない極寒の地域の配管にも使われる。 This pipe joint is used for reducing environmentally hazardous substances. It is also used for piping that is worried about salt damage and piping in extremely cold areas that cannot be used for painting or resin coating.

Claims

最純亜鉛地金又は特殊亜鉛地金を使用して溶融亜鉛めっきしたことを特徴とする管継手。 Pipe fittings that are hot dip galvanized using the purest zinc or special zinc bullion.

最純亜鉛地金又は特殊亜鉛地金を使用して最初に溶融亜鉛めっきをし、その後で溶融亜鉛合−アルミニウム系金めっきをしたことを特徴とする管継手。 A pipe joint obtained by first performing hot dip galvanizing using the purest zinc bullion or special zinc bullion, and then performing hot dip zinc-aluminum gold plating.

セラミック炉を使用したことを特徴とする、請求項１又は請求項２に記載する管継手。 The pipe joint according to claim 1 or 2, wherein a ceramic furnace is used.