JPH05478B2 - - Google Patents
Info
- Publication number
- JPH05478B2 JPH05478B2 JP63197260A JP19726088A JPH05478B2 JP H05478 B2 JPH05478 B2 JP H05478B2 JP 63197260 A JP63197260 A JP 63197260A JP 19726088 A JP19726088 A JP 19726088A JP H05478 B2 JPH05478 B2 JP H05478B2
- Authority
- JP
- Japan
- Prior art keywords
- zinc
- layer
- steel sheet
- oxide
- steel sheets
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000011701 zinc Substances 0.000 claims description 28
- 229910000831 Steel Inorganic materials 0.000 claims description 25
- 239000010959 steel Substances 0.000 claims description 25
- 229910052725 zinc Inorganic materials 0.000 claims description 22
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 20
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 16
- 229910001335 Galvanized steel Inorganic materials 0.000 claims description 15
- 239000008397 galvanized steel Substances 0.000 claims description 15
- 238000003466 welding Methods 0.000 claims description 13
- 239000011787 zinc oxide Substances 0.000 claims description 10
- 239000007800 oxidant agent Substances 0.000 claims description 9
- PTFCDOFLOPIGGS-UHFFFAOYSA-N Zinc dication Chemical compound [Zn+2] PTFCDOFLOPIGGS-UHFFFAOYSA-N 0.000 claims description 6
- 230000002378 acidificating effect Effects 0.000 claims description 5
- 238000005868 electrolysis reaction Methods 0.000 claims description 5
- 229940007718 zinc hydroxide Drugs 0.000 claims description 5
- 229910021511 zinc hydroxide Inorganic materials 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- UGZADUVQMDAIAO-UHFFFAOYSA-L zinc hydroxide Chemical compound [OH-].[OH-].[Zn+2] UGZADUVQMDAIAO-UHFFFAOYSA-L 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 16
- 238000000034 method Methods 0.000 description 16
- 238000007747 plating Methods 0.000 description 16
- 229910052751 metal Inorganic materials 0.000 description 12
- 239000002184 metal Substances 0.000 description 12
- 229910045601 alloy Inorganic materials 0.000 description 10
- 239000000956 alloy Substances 0.000 description 10
- 150000003839 salts Chemical class 0.000 description 9
- 229910052742 iron Inorganic materials 0.000 description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 4
- 230000001590 oxidative effect Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 238000005275 alloying Methods 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 3
- 229920000620 organic polymer Polymers 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 229910010413 TiO 2 Inorganic materials 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- JGJLWPGRMCADHB-UHFFFAOYSA-N hypobromite Chemical compound Br[O-] JGJLWPGRMCADHB-UHFFFAOYSA-N 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 150000002978 peroxides Chemical class 0.000 description 2
- XXQBEVHPUKOQEO-UHFFFAOYSA-N potassium superoxide Chemical compound [K+].[K+].[O-][O-] XXQBEVHPUKOQEO-UHFFFAOYSA-N 0.000 description 2
- 238000007740 vapor deposition Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- SPAGIJMPHSUYSE-UHFFFAOYSA-N Magnesium peroxide Chemical compound [Mg+2].[O-][O-] SPAGIJMPHSUYSE-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- KBTJYNAFUYTSNN-UHFFFAOYSA-N [Na].OO Chemical compound [Na].OO KBTJYNAFUYTSNN-UHFFFAOYSA-N 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- ZJRXSAYFZMGQFP-UHFFFAOYSA-N barium peroxide Chemical compound [Ba+2].[O-][O-] ZJRXSAYFZMGQFP-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- SXDBWCPKPHAZSM-UHFFFAOYSA-N bromic acid Chemical compound OBr(=O)=O SXDBWCPKPHAZSM-UHFFFAOYSA-N 0.000 description 1
- XTEGARKTQYYJKE-UHFFFAOYSA-N chloric acid Chemical compound OCl(=O)=O XTEGARKTQYYJKE-UHFFFAOYSA-N 0.000 description 1
- 229940005991 chloric acid Drugs 0.000 description 1
- QBWCMBCROVPCKQ-UHFFFAOYSA-N chlorous acid Chemical compound OCl=O QBWCMBCROVPCKQ-UHFFFAOYSA-N 0.000 description 1
- 229940077239 chlorous acid Drugs 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- SOCTUWSJJQCPFX-UHFFFAOYSA-N dichromate(2-) Chemical compound [O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O SOCTUWSJJQCPFX-UHFFFAOYSA-N 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- QFWPJPIVLCBXFJ-UHFFFAOYSA-N glymidine Chemical compound N1=CC(OCCOC)=CN=C1NS(=O)(=O)C1=CC=CC=C1 QFWPJPIVLCBXFJ-UHFFFAOYSA-N 0.000 description 1
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 description 1
- SRPSOCQMBCNWFR-UHFFFAOYSA-N iodous acid Chemical compound OI=O SRPSOCQMBCNWFR-UHFFFAOYSA-N 0.000 description 1
- KFZAUHNPPZCSCR-UHFFFAOYSA-N iron zinc Chemical compound [Fe].[Zn] KFZAUHNPPZCSCR-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229960004995 magnesium peroxide Drugs 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- PFUVRDFDKPNGAV-UHFFFAOYSA-N sodium peroxide Chemical compound [Na+].[Na+].[O-][O-] PFUVRDFDKPNGAV-UHFFFAOYSA-N 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000007751 thermal spraying Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Electroplating Methods And Accessories (AREA)
Description
［産業上の利用分野］
本発明は、スポツト溶接電極チツプの耐久性に
優れためつき鋼板の製造方法に関するものであ
る。
［従来の技術］
亜鉛めつき鋼板の溶接性を向上させる方法とし
ては、例えば、特開昭55−110783号、特開昭60−
63394号公報のごとくめつき鋼板表面にAl2O3等
の酸化物皮膜を生成せしめ、該酸化物の高融点、
高電気抵抗を利用し、溶接性を向上させるととも
に電極チツプとめつき金属との接触を妨げ、チツ
プの溶損を防止して寿命延長をはかることが開示
されている。
又特開昭59−104463号公報のごとく、めつき鋼
板の表面に加熱処理により、ZnO／Zn比を0.1〜
0.70にした酸化膜を生成させ同様に溶接性等を向
上させることが開示されている。
しかしながら、このような方法においても、未
だ工業規模では満足すべき結果が得られ難く、め
つき鋼板における溶接性の向上が強く要求されて
いる。
また、いかなる鋼板においても効果のある改善
方法はいまだ見出されていないのが実情であり、
種々の鋼板に共通な改善方法の開発が望まれてい
る。
［発明が解決しようとする課題］
本発明はスポツト溶接電極チツプの耐久性に優
れた亜鉛めつき鋼板の製造方法を提供するもので
ある。
［課題を解決するための手段］
本発明の特徴とするところは、亜鉛めつき鋼板
表面に、亜鉛イオンと酸化剤を含有する酸性浴中
で、鋼板を陰極とし、電解により亜鉛酸化物と亜
鉛水酸化物の１種または２種を含む酸化物層を亜
鉛の量にして0.03〜3.0ｇ／m2付着させることを
特徴とするスポツト溶接電極チツプの耐久性に優
れためつき鋼板の製造方法にある。
本発明の対象とする亜鉛めつき鋼板とは、溶融
めつき法、電気めつき法、蒸着めつき法、溶射法
など各種の製造方法によるものがある。
めつき組成としては純Znの他、ZnとFe、Znと
Ni、ZnとAl、ZnとMnなどZnを主成分として、
耐蝕性など諸機能の向上のため１種ないし２種以
上の合金元素および不純物元素を含み、また、
SiO2、Al2O3などのセラミツクス微粒子、TiO2
などの酸化物、有機高分子をめつき層中に分散さ
せたものがあり、めつき層の厚み方向で単一組成
のもの、連続的あるいは層状に組成が変化するも
のがある。
さらに多層めつき鋼板では、最上層あるいは中
間層、最下層としてFeやNiを主成分とし、Znを
全く含有しないかもしくは一部含有し、Ｐなど各
種合金元素を含む層を有するものがある。
例えば、溶融亜鉛めつき鋼板、鉄−亜鉛合金化
溶融亜鉛めつき鋼板、亜鉛を主とするアルミニウ
ム、鉄などの合金溶融亜鉛めつき鋼板、めつき層
断面方向で下層が合金化されている合金化溶融亜
鉛めつき鋼板（一般にハーフアロイと称する）、
片面鉄・亜鉛合金化溶融亜鉛めつき層、他面溶融
亜鉛めつき層からなるめつき鋼板、これらのめつ
き層上に電気めつき、蒸着めつき等により亜鉛、
鉄、ニツケルを主成分とする金属をめつきした鋼
板、あるいは、電気亜鉛めつき鋼板、亜鉛、ニツ
ケル、クロム等合金電気めつき鋼板等、更に単一
合金層又は多層合金電気めつき鋼板及びこれらの
めつき層上に有機皮膜を被覆しためつき鋼板、亜
鉛および亜鉛含有金属の蒸着めつき鋼板等があ
る。
その他、SiO2、Al2O3などのセラミツクス微粒
子、TiO2酸化物微粒子及び有機高分子などを亜
鉛又は亜鉛合金めつき中に分散させた分散めつき
鋼板がある。
本発明では、該鋼板の表面に、亜鉛イオンと酸
化剤を含有する酸性浴中で、鋼板を陰極とし、電
解により亜鉛酸化物と亜鉛水酸化物の１種または
２種を含む酸化物層を亜鉛の量にして0.03〜3.0
ｇ／m2付着せしめる。
この理由は以下の如くである。
めつき鋼板をスポツト溶接により接合しようと
すると、溶接時の発熱によりめつき層が溶融状態
となり、チツプ組成の銅とめつき金属とが選択的
に反応し、硬く脆い合金層を形成して、チツプが
損耗し、電極チツプの寿命を短命にすることにな
る。
しかしながら、電極チツプとめつき層との間に
亜鉛の酸化物層もしくは水酸化物層が存在する
と、この層は、銅−めつき金属の選択的合金化を
防止する作用があり、電極チツプの損耗を遅延さ
せる。
この理由は、該層によりチツプとめつき金属と
の接触が断たれ、合金層の生成による溶損を防止
するとともに、さらに溶融状態のめつき金属が鋼
板の鉄と合金化され、主として鉄を含有する合金
となり、これが電極チツプの先端に付着し、堆積
してチツプの保護金属膜となり、溶接を継続して
も保護金属膜の厚み、形状には大きな変化がな
く、常時良好な溶接ができ、かつチツプの損傷も
防止できるためと考えられる。
この保護金属の組成は、めつき金属と地鉄との
合金を主体とするもので、平均濃度としてFe：
20〜60％、Zn：48〜80％程度の場合が多いが、
一般にFe濃度の高い方が好ましい。
また、めつき金属の成分、もしくはMn、Ｓな
どの鋼板成分、Crなどの化成処理等表面処理生
成物の成分、およびCuなど電極チツプの成分を
含むことがある。
以上の如く、スポツト溶接電極チツプの寿命を
延長するには亜鉛の酸化物層もしくは水酸化物層
を鋼板表面に形成せしめればよい。
めつき層中に亜鉛を多量に含む場合はこの層を
酸化させればよいが、上層中に亜鉛を含有しない
場合あるいは亜鉛含有量の少ない場合は、単なる
めつき層の酸化では亜鉛の酸化物を形成すること
はできず、めつき層の酸化という方法はかならず
しもすべての鋼板に共通であるとはいえない。
そこで、本発明法ではあらゆるめつき鋼板に共
通な方法として、めつき鋼板表面に亜鉛を酸化さ
せながら付着させる方法を見出した。
すなわち、種々の亜鉛めつき鋼板の表面に、亜
鉛イオンと酸化剤を含有する酸性浴中で鋼板を陰
極とし、電解により亜鉛酸化物と亜鉛水酸化物の
１種または２種を含む酸化物層を付着せしめる方
法である。
ここでいう酸化剤とは、オゾン、過酸化物、過
マンガン酸とその塩類、重クロム酸塩、次亜塩素
酸とその塩類、亜塩素酸とその塩類、塩素酸とそ
の塩類、次亜臭素酸とその塩類、臭素酸とその塩
類、次亜ヨウ素酸とその塩類、ヨウ素酸とその塩
類、硝酸とその塩類等がある。
過酸化物とは、例えば、過酸化カリウム、過酸
化水素、過酸化ナトリウム、過酸化水素ナトリウ
ム、過酸化バリウム、過酸化マグネシウム等をい
い、これらはいずれも酸性水溶液中で過酸化水素
を発生して強い酸化作用を持つ。
本発明法の酸化剤としては、これらの物質の１
種または２種以上を添加して用いることができ
る。また、酸化作用を高めるために酸と併用する
こともできる。
本発明法では、これらの酸化剤を含む水溶液中
で鋼板を陰極として電解を行なう。酸化剤の中で
は、浴の安定性、廃液処理、作業の安全性を考慮
すると、硝酸もしくは硝酸塩が最も好ましい。
本発明法でいう亜鉛酸化物、亜鉛水酸化物を含
む酸化物層とは、ZnO、Zn（OH）2などを含有す
るもので、上層めつき組成金属の酸化物、たとえ
ば鉄−亜鉛合金めつきの場合のZnFe2O4などある
いは浴中に含まれる物質を含んでいてもよい。ま
た、Alなどの不純物を含んでいてもかまわない。
該酸化物層の付着量は、亜鉛の量にして0.03
ｇ／m2未満では溶接性を向上させる効果がないた
め、この値を下限とし、また、3.0ｇ／m2を超え
ると化成処理性が劣化するため、この値を上限と
する。
しかして亜鉛イオン量としては、上記のごと
く、酸化物層をZn量として0.03〜3.0ｇ／m2生成
させるものであり、Zn2+として必然的に定まる。
又酸化剤量としても亜鉛イオンを酸化させるに必
要な量であり、これも必然的に定まる。
［実施例］
次に本発明の実施例を比較例とともに第１表に
挙げる。
第１表に示すごとく、本発明法によれば、電極
チツプの寿命が比較例に比して格段に向上してい
ることがわかる。
[Industrial Field of Application] The present invention relates to a method for manufacturing a hot-spot steel plate with excellent durability for spot welding electrode chips. [Prior Art] Methods for improving the weldability of galvanized steel sheets include, for example, Japanese Patent Application Laid-open Nos. 55-110783 and 1983-
As described in Publication No. 63394, an oxide film such as Al 2 O 3 is formed on the surface of the galvanized steel sheet, and the high melting point of the oxide,
It is disclosed that high electrical resistance is utilized to improve weldability and to prevent contact between the electrode tip and the plating metal, thereby preventing melting and damage of the tip and extending its life. Furthermore, as disclosed in Japanese Patent Application Laid-open No. 59-104463, the surface of the plated steel sheet is heat treated to increase the ZnO/Zn ratio from 0.1 to
It has been disclosed that the weldability and the like can be similarly improved by forming an oxide film with a 0.70. However, even with such methods, it is still difficult to obtain satisfactory results on an industrial scale, and there is a strong demand for improved weldability in galvanized steel sheets. In addition, the reality is that no effective improvement method has yet been found for any steel plate.
It is desired to develop a common improvement method for various steel plates. [Problems to be Solved by the Invention] The present invention provides a method for manufacturing a galvanized steel sheet with excellent durability for spot welding electrode tips. [Means for Solving the Problems] The present invention is characterized in that zinc oxide and zinc are formed on the surface of a galvanized steel sheet by electrolysis in an acidic bath containing zinc ions and an oxidizing agent, using the steel sheet as a cathode. A method for manufacturing a highly durable hot-dipped steel plate for spot welding electrode tips, characterized in that an oxide layer containing one or two types of hydroxide is deposited in an amount of 0.03 to 3.0 g/m 2 of zinc. be. The galvanized steel sheets that are the object of the present invention include those manufactured by various methods such as hot-dip plating, electroplating, vapor deposition plating, and thermal spraying. The plating composition includes pure Zn, Zn and Fe, and Zn and
With Zn as the main component, such as Ni, Zn and Al, Zn and Mn,
Contains one or more alloying elements and impurity elements to improve various functions such as corrosion resistance, and
Ceramic particles such as SiO 2 and Al 2 O 3 , TiO 2
There are types in which oxides and organic polymers such as oxides and organic polymers are dispersed in the plating layer, and there are those with a single composition in the thickness direction of the plated layer, and those with a composition that changes continuously or in layers. Furthermore, some multi-layer plated steel sheets have a top layer, an intermediate layer, and a bottom layer that are mainly composed of Fe or Ni, contain no or some Zn, and contain various alloying elements such as P. For example, hot-dip galvanized steel sheets, iron-zinc alloyed hot-dip galvanized steel sheets, hot-dip galvanized steel sheets made of alloys such as aluminum and iron containing mainly zinc, and alloys whose lower layer is alloyed in the cross-sectional direction of the plating layer. Hot-dip galvanized steel sheet (generally referred to as half-alloy),
A galvanized steel sheet consisting of an iron/zinc alloyed hot-dip galvanized layer on one side and a hot-dip galvanized layer on the other side. Zinc,
Steel sheets plated with metals mainly composed of iron or nickel, electrogalvanized steel sheets, electroplated steel sheets with alloys such as zinc, nickel, chromium, etc., single alloy layer or multilayer alloy electroplated steel sheets, and these. There are plated steel sheets with an organic film coated on the plating layer, and steel sheets plated with zinc and zinc-containing metals by vapor deposition. In addition, there are dispersion-plated steel sheets in which fine ceramic particles such as SiO 2 and Al 2 O 3 , fine particles of TiO 2 oxide, and organic polymers are dispersed in zinc or zinc alloy plating. In the present invention, an oxide layer containing one or both of zinc oxide and zinc hydroxide is formed on the surface of the steel sheet by electrolysis in an acidic bath containing zinc ions and an oxidizing agent, using the steel sheet as a cathode. The amount of zinc is 0.03-3.0
g/ m2 to be deposited. The reason for this is as follows. When plated steel plates are joined by spot welding, the heat generated during welding melts the plated layer, causing the copper in the chip composition to react selectively with the plated metal, forming a hard and brittle alloy layer, which causes the chip to melt. is worn out, shortening the life of the electrode tip. However, if a zinc oxide or hydroxide layer exists between the electrode tip and the plating layer, this layer has the effect of preventing selective alloying of copper and the plating metal, leading to wear and tear on the electrode tip. delay. The reason for this is that the contact between the chip and the plating metal is cut off by the layer, preventing erosion due to the formation of an alloy layer, and the plating metal in a molten state is alloyed with the iron of the steel plate, which mainly contains iron. This becomes an alloy that adheres to the tip of the electrode tip and forms a protective metal film for the chip.Even if welding continues, the thickness and shape of the protective metal film do not change significantly, allowing for consistently good welding. This is also thought to be because damage to the chip can be prevented. The composition of this protective metal is mainly an alloy of plating metal and base iron, and the average concentration is Fe:
20-60%, Zn: 48-80%,
Generally, a higher Fe concentration is preferable. It may also contain components of plating metal, components of steel sheets such as Mn and S, components of surface treatment products such as chemical conversion treatment such as Cr, and components of electrode chips such as Cu. As described above, in order to extend the life of the spot welding electrode tip, it is sufficient to form a zinc oxide layer or hydroxide layer on the surface of the steel sheet. If the plating layer contains a large amount of zinc, it is sufficient to oxidize this layer, but if the upper layer does not contain zinc or has a low zinc content, simply oxidizing the plating layer will produce zinc oxide. It cannot be said that the method of oxidizing the plated layer is necessarily common to all steel sheets. Therefore, in the method of the present invention, a method common to all galvanized steel plates has been discovered, in which zinc is oxidized and adhered to the surface of the galvanized steel plate. That is, an oxide layer containing one or both of zinc oxide and zinc hydroxide is formed on the surface of various galvanized steel sheets by electrolysis in an acidic bath containing zinc ions and an oxidizing agent, with the steel sheet serving as a cathode. This is a method of attaching. The oxidizing agents mentioned here include ozone, peroxide, permanganic acid and its salts, dichromate, hypochlorous acid and its salts, chlorous acid and its salts, chloric acid and its salts, and hypobromite. These include acids and their salts, bromic acid and its salts, hypoiodic acid and its salts, iodic acid and its salts, nitric acid and its salts, etc. Peroxide refers to, for example, potassium peroxide, hydrogen peroxide, sodium peroxide, sodium hydrogen peroxide, barium peroxide, magnesium peroxide, etc., all of which generate hydrogen peroxide in an acidic aqueous solution. It has a strong oxidizing effect. As the oxidizing agent for the method of the present invention, one of these substances can be used.
A species or two or more species can be added and used. It can also be used in combination with an acid to enhance the oxidizing effect. In the method of the present invention, electrolysis is performed in an aqueous solution containing these oxidizing agents using a steel plate as a cathode. Among the oxidizing agents, nitric acid or nitrates are most preferred in consideration of bath stability, waste liquid treatment, and work safety. In the method of the present invention, the oxide layer containing zinc oxide or zinc hydroxide refers to a layer containing ZnO, Zn(OH) 2 , etc. It may contain ZnFe 2 O 4 or other substances contained in the bath. Further, it may contain impurities such as Al. The amount of adhesion of the oxide layer is 0.03 in terms of the amount of zinc.
If it is less than 3.0 g/m 2 , there is no effect of improving weldability, so this value is set as the lower limit, and if it exceeds 3.0 g/m 2 , chemical conversion properties deteriorate, so this value is set as the upper limit. However, as mentioned above, the amount of zinc ions is such that the oxide layer is produced in the amount of Zn of 0.03 to 3.0 g/m 2 , and is inevitably determined as Zn 2+ .
Further, the amount of oxidizing agent is the amount necessary to oxidize zinc ions, and this is also necessarily determined. [Examples] Next, Examples of the present invention are listed in Table 1 along with comparative examples. As shown in Table 1, it can be seen that according to the method of the present invention, the life of the electrode chip is significantly improved compared to the comparative example.
【表】【table】
【表】
［発明の効果］
かくすることにより、スポツト溶接において、
連続打点数を増加し、それだけチツプを取り替え
ることなく長時間溶接ができ、チツプの耐久性を
向上することができる。また、適正溶接電流範囲
が従来材と同レベルであるので、溶接時の生産性
を著しく向上することができる。[Table] [Effects of the invention] By doing so, in spot welding,
By increasing the number of continuous welding points, it is possible to weld for a longer period of time without replacing the tip, and the durability of the tip can be improved. Furthermore, since the appropriate welding current range is at the same level as conventional materials, productivity during welding can be significantly improved.
Claims (1)
剤を含有する酸性浴中で、鋼板を陰極とし、電解
により亜鉛酸化物と亜鉛水酸化物の１種または２
種を含む酸化物層を、亜鉛の量にして0.03〜3.0
ｇ／m2付着させることを特徴とするスポツト溶接
電極チツプの耐久性に優れためつき鋼板の製造方
法。1 One or two types of zinc oxide and zinc hydroxide are applied to the surface of a galvanized steel sheet by electrolysis in an acidic bath containing zinc ions and an oxidizing agent, with the steel sheet serving as a cathode.
The amount of zinc in the oxide layer containing seeds is 0.03 to 3.0
A method for producing a highly durable hot-damp steel plate for spot welding electrode chips, characterized by adhesion of g/m 2 .
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63197260A JPH0247293A (en) | 1988-08-09 | 1988-08-09 | Production of plated steel sheet having superior spot weldability |
| EP89102457A EP0329057B1 (en) | 1988-02-19 | 1989-02-13 | Use of a zinc- or zinc alloy-coated steel sheet having excellent spot-weldability |
| DE68917332T DE68917332T2 (en) | 1988-02-19 | 1989-02-13 | Using a zinc or zinc alloy clad steel sheet with excellent spot welding properties. |
| US07/309,260 US4957594A (en) | 1988-02-19 | 1989-02-13 | Process for producing a zinc or zinc alloy coated steel sheet having excellent spot weldability |
| CA000591318A CA1332679C (en) | 1988-02-19 | 1989-02-17 | Zinc- or zinc alloy-coated steel sheet having excellent spot-weldability and process for producing same |
| KR1019890001886A KR920002416B1 (en) | 1988-02-19 | 1989-02-18 | Process for producing a zinc or zinc alloy coated steel sheet having excellent spot weldability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63197260A JPH0247293A (en) | 1988-08-09 | 1988-08-09 | Production of plated steel sheet having superior spot weldability |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0247293A JPH0247293A (en) | 1990-02-16 |
| JPH05478B2 true JPH05478B2 (en) | 1993-01-06 |
Family
ID=16371507
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63197260A Granted JPH0247293A (en) | 1988-02-19 | 1988-08-09 | Production of plated steel sheet having superior spot weldability |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0247293A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6350499A (en) * | 1986-08-18 | 1988-03-03 | Nippon Steel Corp | Colored zinc composite plated steel sheet and its production |
-
1988
- 1988-08-09 JP JP63197260A patent/JPH0247293A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6350499A (en) * | 1986-08-18 | 1988-03-03 | Nippon Steel Corp | Colored zinc composite plated steel sheet and its production |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0247293A (en) | 1990-02-16 |
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