JPH03164239A - Zinc-plated steel sheet with excellent spot weldability - Google Patents

Zinc-plated steel sheet with excellent spot weldability

Info

Publication number
JPH03164239A
JPH03164239A JP30513789A JP30513789A JPH03164239A JP H03164239 A JPH03164239 A JP H03164239A JP 30513789 A JP30513789 A JP 30513789A JP 30513789 A JP30513789 A JP 30513789A JP H03164239 A JPH03164239 A JP H03164239A
Authority
JP
Japan
Prior art keywords
steel sheet
rust
zinc
oil layer
amt
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.)
Granted
Application number
JP30513789A
Other languages
Japanese (ja)
Other versions
JP2631235B2 (en
Inventor
Hiroshi Sato
佐藤 廣士
Masao Toyama
雅雄 外山
Tsugumoto Ikeda
池田 貢基
Jiyunji Kawafuku
川福 純司
Atsushi Kato
淳 加藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kobe Steel Ltd
Original Assignee
Kobe Steel Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kobe Steel Ltd filed Critical Kobe Steel Ltd
Priority to JP30513789A priority Critical patent/JP2631235B2/en
Publication of JPH03164239A publication Critical patent/JPH03164239A/en
Application granted granted Critical
Publication of JP2631235B2 publication Critical patent/JP2631235B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Laminated Bodies (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)

Abstract

PURPOSE:To improve spot weldability without affecting a harmful influence on characteristics required for a zinc-plated steel sheet by providing a rust-proof oil layer contg. a specified amt. of a silane coupling agent on the surface of the steel sheet. CONSTITUTION:For the title zinc-plated steel sheet, a rust-proof oil layer contg. 0.05-50wt.% silane coupling agent is provided on the surface of the steel sheet. In the rust-proof oil layer, when the amt. of the silane coupling agent is less than 0.05wt.%, an effect improving a life of a chip is less in comparison with the case where only a rust-proof oil layer is provided on the surface of the steel sheet and on the contrary, when the amt. exceeds 50wt.%, a rust-proof ability which the rust-proof oil layer originally has decreases. A suitable amt. of coating of the surface of the steel sheet with such a rust-proof oil layer depends on a pressure applied on a chip when a spot welding is performed and it is ordinary pref. that the amt. is 0.1g/m<2> or larger. However, as the effect is saturated even if too excess atm. is applied on the surface of the steel sheet, it is usually pref. that the amt. is 1g/m<2> or less.

Description

【発明の詳細な説明】 皮粟上■赴徂分立 本発明は、スポット溶接性にすぐれる亜鉛系めっき鋼板
に関し、詳しくは、耐食性、プレス戒形性及びリン酸塩
処理性にすぐれると共に、スポット溶接性にすぐれる亜
鉛系めっき鋼仮に関する.丈来旦及査 一般に、亜鉛系めっき鋼板は、耐食性にすぐれるので、
自動車用外板、内板、家庭電気製品、建築材料等に広く
用いられている。
[Detailed Description of the Invention] The present invention relates to a galvanized steel sheet that has excellent spot weldability, and more specifically, has excellent corrosion resistance, press shapeability, and phosphate treatment properties, and Concerning temporary zinc-plated steel with excellent spot weldability. In general, galvanized steel sheets have excellent corrosion resistance, so
Widely used for automobile outer panels, inner panels, home appliances, building materials, etc.

しかし、近年、亜鉛系めっき@板には、耐食性に加えて
、加工性、塗装性、溶接性等の性能にっいても、改善が
要求されるに至っている。なかでも、溶接性、特に、ス
ポット溶接性の改善が強く要望されている。
However, in recent years, zinc-based plated sheets have been required to be improved not only in corrosion resistance but also in performance such as workability, paintability, and weldability. Among these, there is a strong demand for improvement in weldability, particularly spot weldability.

ところで、亜鉛系めっき鋼板をスポット溶接する場合は
、冷間圧延鋼板に比較して、チップの寿命が短い。これ
は、よく知られているように、溶接の途中において、チ
ップの材料である銅とめつき層中の亜鉛とが反応して、
チップ先端の表面に低融点の亜鉛一銅合金層が形或され
、連続的に溶接を行なうとき、この合金層の形戒と剥離
が繰り返されるからである。
By the way, when spot welding zinc-based plated steel sheets, the life of the chips is shorter than that of cold-rolled steel sheets. As is well known, during welding, the copper that is the material of the chip reacts with the zinc in the plating layer.
This is because a low melting point zinc-copper alloy layer is formed on the surface of the tip end, and when welding is performed continuously, this alloy layer is repeatedly deformed and peeled off.

また、溶接されるめっき鋼板の間にめっき層が存在する
場合は、低融点のめつき層が通電初期に溶融し、電流密
度が低下して、発熱効率が低下する結果として、更に、
チップ寿命が短くなる。
In addition, when a plating layer exists between the plated steel sheets to be welded, the plating layer with a low melting point melts at the initial stage of energization, lowering the current density and reducing heat generation efficiency.
Chip life will be shortened.

そこで、このような亜鉛系めっき鋼板のスポット溶接に
おける問題を解決するために、例えば、特開昭63−1
86882号公報には、亜鉛系めっき鋼板上にFe, 
Zn−Fe, TiOz、AI203、Sin.等の酸
化物等からなる上層めっきを設けることが提案されてお
り、また、特開昭63−186883号公報には、めっ
き鋼板表面に加熱処理等によって、酸化被膜を形戒する
ことが提案されている。更に、特開昭63−11998
8号公報には、例えば、母材にSiを含有させて、その
電気抵抗値を高める等、母材及びめっき層の電気抵抗を
高くすることが提案されている。
Therefore, in order to solve such problems in spot welding of zinc-based plated steel sheets, for example, Japanese Patent Laid-Open No. 63-1
No. 86882 discloses that Fe,
Zn-Fe, TiOz, AI203, Sin. It has been proposed to provide an upper layer plating consisting of oxides such as ing. Furthermore, JP-A No. 63-11998
No. 8 proposes increasing the electrical resistance of the base material and the plating layer by, for example, incorporating Si into the base material to increase its electrical resistance value.

他方、チップ表面にFe, Ni, Ti, ZrOz
、TiBrz等を被覆することによって、チップを改善
することも試みられている。
On the other hand, Fe, Ni, Ti, ZrOz on the chip surface
Attempts have also been made to improve the chip by coating it with materials such as , TiBrz, etc.

上述したような方法は、いずれも、ある程度、有効であ
って、一部は、実用化されているが、しかし、溶接性以
外の性能、例えば、耐食性、加工性、リン酸塩処理性等
に有害な影響を与えることがあり、更に、処理に大規模
な設備を必要として、製造費用を高めるので、上述した
方法を工業的規模において適用することは、実際上は困
難である。
All of the above-mentioned methods are effective to some extent, and some have been put into practical use; however, they have problems with performance other than weldability, such as corrosion resistance, workability, phosphate treatability, etc. It is difficult in practice to apply the above-mentioned method on an industrial scale, since it can have harmful effects and, furthermore, requires large-scale equipment for processing, increasing production costs.

が7゜しよ゛と る 本発明者らは、上記したような亜鉛系めっき鋼板のスポ
ット溶接における種々の問題を解決する?めに鋭意研究
した結果、亜鉛系めっき鋼板上に防錆油を塗布すること
によって、亜鉛系めっき鋼板上に防錆油を塗布しない場
合に比べて、スポット溶接時のチップ寿命が改善される
ことを見出し、更に、防錆油にシランカツプリング剤を
加えることによって、チップ寿命が格段に改善されるこ
とを見出して、本発明に至ったものである。
is 7°, the present inventors solve various problems in spot welding of galvanized steel sheets as described above. As a result of intensive research, we have found that by applying rust preventive oil to zinc-based plated steel sheets, the life of the tip during spot welding is improved compared to when no rust preventive oil is applied to the zinc-based plated steel sheets. The present invention was developed based on the discovery that the chip life can be significantly improved by adding a silane coupling agent to the rust preventive oil.

従って、本発明は、耐食性をはしめ、加工性やリン酸塩
処理性等、本来、亜鉛系めっき鋼仮に要求されている特
性に有害な影響を及ぼすことなく、スポット溶接性を改
善した亜鉛系めっき鋼板を提供することを目的とする。
Therefore, the present invention provides zinc-based plating that enhances corrosion resistance and improves spot weldability without adversely affecting the properties originally required for zinc-based plated steel, such as workability and phosphate treatability. The purpose is to provide steel plates.

婬業置」れ吃(薊1A■モ段 本発明によるスポツ口容接性にすぐれる亜鉛系めつきm
Fiは、鋼板の表面にシランカツブリング剤0.05〜
50重量%を含有する防錆油層が設けられていることを
特徴とする。
1A ■Modern Zinc-based plating with excellent spot acceptability according to the present invention
Fi is 0.05 to 0.05 to 0.05 to 0.05 to 0.05 to 0.05 to 0.05 to 0.05 to
It is characterized by being provided with a rust-preventing oil layer containing 50% by weight.

シランカツプリング剤を含有する防錆油を亜鉛系めっき
鋼板に塗布することによって、スポット溶接性が改善さ
れるのは、鋼板がチップにて加圧されたとき、シランカ
ップリング剤は、防錆油と共にチップ表面の凹凸に沿っ
て廻り込み、その後の通電による発熱によって、シラン
カツプリング剤を含有する防錆油が分解し、蒸発した後
も、シランカツプリング剤中のケイ素が酸化されて生じ
た二酸化ケイ素が鋼板とチップの表面に残留し、付着し
て、チップとめつき層との間の反応を抑制すると共に、
チップ表面に形成された合金層の剥離を抑制するからで
あるとみられる。
Spot weldability is improved by applying rust preventive oil containing a silane coupling agent to zinc-based plated steel sheets. The anti-corrosion oil that contains the silane coupling agent is decomposed by the heat generated by the heat generated by the subsequent energization, and even after evaporation, the silicon in the silane coupling agent is oxidized and generated. The silicon dioxide remains on the surface of the steel plate and the chip and adheres to it, suppressing the reaction between the chip and the plating layer, and
This seems to be because it suppresses the peeling of the alloy layer formed on the chip surface.

更に、溶接される亜鉛系めっき鋼板間においても、通電
によってシランカツプリング剤を含有する防錆油が分解
、蒸発した後も、シランカツブリング剤中のケイ素が酸
化されて生じた二酸化ケイ素が残留し、その高い電気抵
抗値によって通電路を制限し、めっき鋼板間の発熱効率
を高くすることによって、ナゲット形成へ速やかに移行
させる働きをするので、チップの寿命を一層改善するも
のとみられる。
Furthermore, even after the rust preventive oil containing the silane coupling agent decomposes and evaporates between galvanized steel plates to be welded, silicon dioxide, which is produced by oxidation of the silicon in the silane coupling agent, remains. However, its high electrical resistance value restricts the current flow path and increases the heat generation efficiency between the plated steel plates, which works to quickly transition to nugget formation, which is expected to further improve the life of the chip.

本発明においては、シランカツプリング剤と防錆油との
間には、何ら化学反応を必要としないので、亜鉛系めっ
き鋼仮としては、特に、限定されることなく、電気亜鉛
めっき鋼板、溶融亜鉛めっき鋼板、Fe−Zn系合金化
溶融亜鉛めっき鋼板、電気Zn−Fe系合金めっき鋼板
、電気Z n − Ni系合金めっき鋼板、蒸着亜鉛め
っき鋼板等が用いられるが、更に、これらを組み合わせ
た複層亜鉛めっき鋼板や、Fe,Ni以外の金属との亜
鉛合金めっき鋼板も用いられる。また、亜鉛めっき鋼板
は、片面、両面いずれのめつき鋼板でもよい。
In the present invention, since no chemical reaction is required between the silane coupling agent and the rust preventive oil, the temporary galvanized steel can be used without particular limitation, such as electrogalvanized steel sheet, hot-dip galvanized steel sheet, etc. Galvanized steel sheets, Fe-Zn alloyed hot-dip galvanized steel sheets, electrolytic Zn-Fe alloy-plated steel sheets, electrolytic Zn-Ni alloy-plated steel sheets, vapor deposited galvanized steel sheets, etc. are used, but furthermore, combinations of these are used. Multi-layer galvanized steel sheets and zinc alloy-plated steel sheets with metals other than Fe and Ni are also used. Further, the galvanized steel sheet may be a single-sided or double-sided galvanized steel sheet.

更に、防錆油も、通常、用いられているものでよく、特
に、限定されるものではない。従って、例えば、ノック
スラスト530F (.日本パー力ライジング社製)、
ダイヤモンドPA920(三菱石油製)、メタルガード
#814(モービル石油製)等を好適に用いることがで
きる。
Furthermore, the antirust oil may be one commonly used and is not particularly limited. Therefore, for example, Nox Last 530F (manufactured by Nippon Pariki Rising Co., Ltd.),
Diamond PA920 (manufactured by Mitsubishi Oil), Metal Guard #814 (manufactured by Mobil Oil), etc. can be suitably used.

また、シランカツプリング剤も、防錆油の粘度を著しく
変化させたり、或いは防錆油との相溶性が全くないもの
でなければ、特に、限定されることなく、任意のものを
用いることができる。例えば、A−172、A−174
(日本ユニカ−社製)KBM5 0 3、KBM100
3 (信越化学工業社製)等を用いることができる。
Furthermore, the silane coupling agent is not particularly limited, and any silane coupling agent may be used as long as it does not significantly change the viscosity of the rust preventive oil or has no compatibility with the rust preventive oil. can. For example, A-172, A-174
(manufactured by Nippon Unica) KBM503, KBM100
3 (manufactured by Shin-Etsu Chemical Co., Ltd.), etc. can be used.

本発明による亜鉛系めっき鋼板においては、このような
シランカップリング剤を0.05〜50重量%含有する
防錆油層が鋼板表面に設けられている。防錆油層におい
てシランカップリング剤の量が0.05重量%よりも少
ないときは、防錆油層のみを鋼板表面に設けた場合に比
較しても、チップ寿命の改善の効果が少なく、他方、5
0重量%を越えるときは、防錆油層の本来有する防錆能
力が低下する。
In the zinc-based plated steel sheet according to the present invention, a rust preventive oil layer containing 0.05 to 50% by weight of such a silane coupling agent is provided on the surface of the steel sheet. When the amount of silane coupling agent in the rust-preventing oil layer is less than 0.05% by weight, the effect of improving chip life is small compared to when only the rust-preventing oil layer is provided on the surface of the steel plate, and on the other hand, 5
When it exceeds 0% by weight, the rust-preventing ability inherent in the rust-preventing oil layer decreases.

112I板表面におけるこのような防錆油層の好適な塗
布量は、スポット溶接時におけるチップの加圧力にもよ
るが、通常は、0.1g/rrf以上であることが望ま
しい。しかし、鋼板の表面に過大な里にて塗布しても、
効果が飽和するので、通常は、1g/%以下でよい。し
かし、防錆油をプレス時の潤滑油として用いることを意
図するような場合等もあるので、特に、上限は限定され
るものではない。
The suitable coating amount of such a rust-preventing oil layer on the surface of the 112I plate depends on the pressing force of the tip during spot welding, but it is usually desirably 0.1 g/rrf or more. However, even if applied to the surface of the steel plate with an excessive amount,
Since the effect is saturated, the amount is usually 1 g/% or less. However, since there are cases where the rust preventive oil is intended to be used as a lubricating oil during pressing, the upper limit is not particularly limited.

発』Iと匪果 以上のよう4こ、本発明による亜鉛系めっき鋼板は、そ
の表面にシランカップリング剤を含有する防錆油層が設
けられており、ここに、シランカップリング剤は、めっ
き層と何ら特別な化学反応を起こさないので、亜鉛系め
っき鋼板にとって最も重要な特性である耐食性を劣化さ
せることがなく、スポット溶接性が改善されている。し
かも、本発明によれば、スポット溶接後の脱脂工程にお
いて、過剰のシランカップリング剤やスポット?容接部
に残留している二酸化ケイ素が防錆油と共に除去される
ので、リン酸塩処理性にも何ら有害な影響を与えること
がなく、また、ブレス戒形性等の加工性にも何ら有害な
影響を与えることがない。
As described above, the galvanized steel sheet according to the present invention is provided with a rust preventive oil layer containing a silane coupling agent on its surface, and the silane coupling agent is applied to the plating layer. Since it does not cause any special chemical reaction with the galvanized steel sheet, it does not deteriorate corrosion resistance, which is the most important property for zinc-based coated steel sheets, and improves spot weldability. Moreover, according to the present invention, in the degreasing process after spot welding, excessive silane coupling agent and spot welding can be avoided. Since the silicon dioxide remaining in the contact area is removed together with the rust preventive oil, it does not have any harmful effect on phosphating properties, and it also has no effect on processability such as pressability. No harmful effects.

実一衡明 以下に実施例を挙げて本発明を説明するが、本発明はこ
れら実施例により何ら限定されるものではない。
EXAMPLES The present invention will be explained below with reference to Examples, but the present invention is not limited to these Examples in any way.

第1表に示す種々の亜鉛系めっき鋼板の表面にシランカ
ツプリング剤を含有する防錆油を塗布した後、下記の溶
接性試験を行なった。
After applying rust preventive oil containing a silane coupling agent to the surface of various zinc-based plated steel sheets shown in Table 1, the following weldability test was conducted.

溶接電流:10KA 加圧力 :250kgf 通電時間:12サイクル 電極  :Cu−1%Cr 防錆油 :ノツクスラスト530F (日本パーカライ
ジング社製) この試験方法によって連続溶接を行なって、200点ご
とに電流8.5KA″″?:溶接した後、ナゲット径が
4Jt (tは板厚を示す。)以上を満たす最大打点数
をチップ寿命として評価した。結果を第l表に示す。
Welding current: 10 KA Pressure force: 250 kgf Current application time: 12 cycles Electrode: Cu-1% Cr Rust preventive oil: Noxlast 530F (manufactured by Nippon Parkerizing Co., Ltd.) Continuous welding was performed using this test method, and a current of 8.5 KA was applied every 200 points. ″″? : After welding, the maximum number of dots that satisfied the nugget diameter of 4 Jt (t indicates the plate thickness) or more was evaluated as the chip life. The results are shown in Table I.

また、比較のために、防錆油にシランカツプリング剤を
含有させることなく、又は本発明にて規定する下限量を
下回る量にてシランカツブリング剤を含有させた防錆油
を鋼板に塗布し、同様にして、溶接性試験を行なった。
For comparison, rust preventive oil was applied to a steel plate without containing a silane coupling agent or in which a silane coupling agent was contained in an amount below the lower limit specified in the present invention. However, a weldability test was conducted in the same manner.

尚、上記防錆油は、脂肪酸バリウム塩、石抽スルホン酸
カルシウム・ナトリウム塩、ナフテン系低粘度油及びパ
ラフィン系高粘度油からなる。
The above-mentioned rust-preventing oil is composed of fatty acid barium salt, mineral extracted sulfonic acid calcium/sodium salt, naphthenic low viscosity oil, and paraffinic high viscosity oil.

また、第l表において用いたシランカツブリング剤は次
のとおりである。
In addition, the silane cobbling agents used in Table 1 are as follows.

A174 T−メタクリ口キシプ口ピルトリメトキシシ
ラン KBM1003  ビニルトリメトキシシランA172
 ビニルトリス(β−メトキシエトキシ)シラン KBM503  r−メタクリ口キシプロビルトリメト
キシシラン 第1表から明らかなように、本発明による亜鉛系めっき
鋼板は、比較例に比べて、チップ寿命が1.5〜3倍に
も改善されている。
A174 T-methacrylate trimethoxysilane KBM1003 Vinyltrimethoxysilane A172
Vinyl tris (β-methoxyethoxy) silane KBM503 r-methacrylate xypropyltrimethoxysilane As is clear from Table 1, the zinc-based plated steel sheet according to the present invention has a chip life of 1.5 to 1.5% compared to the comparative example. It has been improved by 3 times.

Claims (1)

【特許請求の範囲】[Claims] (1)鋼板の表面にシランカップリング剤0.05〜5
0重量%を含有する防錆油層が設けられていることを特
徴とするスポット溶接性にすぐれる亜鉛系めつき鋼板。
(1) Silane coupling agent 0.05-5 on the surface of the steel plate
A zinc-plated steel sheet with excellent spot weldability, characterized by being provided with a rust-preventing oil layer containing 0% by weight.
JP30513789A 1989-11-24 1989-11-24 Zinc-plated steel sheet with excellent spot weldability Expired - Lifetime JP2631235B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP30513789A JP2631235B2 (en) 1989-11-24 1989-11-24 Zinc-plated steel sheet with excellent spot weldability

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP30513789A JP2631235B2 (en) 1989-11-24 1989-11-24 Zinc-plated steel sheet with excellent spot weldability

Publications (2)

Publication Number Publication Date
JPH03164239A true JPH03164239A (en) 1991-07-16
JP2631235B2 JP2631235B2 (en) 1997-07-16

Family

ID=17941533

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
JP (1) JP2631235B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011080141A (en) * 2009-09-09 2011-04-21 Jx Nippon Oil & Energy Corp Anticorrosive oil composition
US7964286B2 (en) * 2005-09-09 2011-06-21 University of Cinicnnati Coating composition of oil and organofunctional silane, and tire cord coated therewith
US7972659B2 (en) 2008-03-14 2011-07-05 Ecosil Technologies Llc Method of applying silanes to metal in an oil bath containing a controlled amount of water
WO2015037662A1 (en) * 2013-09-11 2015-03-19 新日鐵住金ステンレス株式会社 Clear-coated stainless steel sheet

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7964286B2 (en) * 2005-09-09 2011-06-21 University of Cinicnnati Coating composition of oil and organofunctional silane, and tire cord coated therewith
US7972659B2 (en) 2008-03-14 2011-07-05 Ecosil Technologies Llc Method of applying silanes to metal in an oil bath containing a controlled amount of water
JP2011080141A (en) * 2009-09-09 2011-04-21 Jx Nippon Oil & Energy Corp Anticorrosive oil composition
WO2015037662A1 (en) * 2013-09-11 2015-03-19 新日鐵住金ステンレス株式会社 Clear-coated stainless steel sheet
JP2015054450A (en) * 2013-09-11 2015-03-23 新日鐵住金ステンレス株式会社 Clear-coated stainless steel sheet

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