JPH0660380B2 - Aluminum plated steel sheet for engine exhaust gas materials with excellent corrosion resistance - Google Patents
Aluminum plated steel sheet for engine exhaust gas materials with excellent corrosion resistanceInfo
- Publication number
- JPH0660380B2 JPH0660380B2 JP2077517A JP7751790A JPH0660380B2 JP H0660380 B2 JPH0660380 B2 JP H0660380B2 JP 2077517 A JP2077517 A JP 2077517A JP 7751790 A JP7751790 A JP 7751790A JP H0660380 B2 JPH0660380 B2 JP H0660380B2
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- Prior art keywords
- corrosion resistance
- steel sheet
- steel
- aluminum
- plating
- Prior art date
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Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、自動車などの排ガス用マフラーや排気管内で
生成する湿潤ガス、排ガス凝縮液中の耐食性、および塩
害環境で優れた性能を有するアルミめっき鋼板に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an aluminum muffler for exhaust gas of automobiles or the like, a wet gas generated in an exhaust pipe, corrosion resistance in exhaust gas condensate, and excellent performance in a salt damage environment. The present invention relates to a plated steel sheet.
（従来の技術） 従来、自動車の場合、エンジンで発生した排ガスは、エ
キゾーストマニホールド、コンバーターなどを通過後、
センターパイプ、マフラー、テールパイプを経て排気系
から排出される。エンジン始動時は、マフラーなどの排
気系材料の温度が低いために排ガス中の水分が凝縮した
凝縮液が内壁面に付着し、また底部に滞留する。(Prior Art) Conventionally, in the case of automobiles, exhaust gas generated by an engine passes through an exhaust manifold, a converter, etc.,
It is discharged from the exhaust system through the center pipe, muffler and tail pipe. When the engine is started, the temperature of the exhaust system material such as the muffler is low, so that the condensed liquid in which the moisture in the exhaust gas is condensed adheres to the inner wall surface and stays at the bottom.
この様に生成した凝縮液にはCO３ 2-、NH４ ＋、SO４ 2-、
NO３ −、その他、Cl−や微量の有機物が含まれ、排気系
材料の内面耐食性に影響する。さらに排気系材料の温度
が上昇するに従って、水分が蒸発しやすくなる。この
際、凝縮液に含まれる主成分は濃化すると共にアンモニ
アなどの揮発しやすい成分が飛ぶために、凝縮液の液性
はアルカリ性から酸性へ変化していく。CO 3 2- in the condensate produced in this way, NH 4 +, SO 4 2- ,
It contains NO 3 − , other than that, Cl − and trace amounts of organic substances, and affects the internal corrosion resistance of exhaust system materials. Further, as the temperature of the exhaust system material rises, the water content is likely to evaporate. At this time, the main component contained in the condensate is concentrated, and components such as ammonia that are easily volatilized fly, so that the liquid property of the condensate changes from alkaline to acidic.
また走行モードによっては長時間、凝縮液の溜った耐食
性に影響の大きな環境も発生する。In addition, depending on the driving mode, an environment in which the condensation resistance of the condensate has a great influence on the corrosion resistance for a long time may occur.
一方、融雪塩などを散布する塩害環境では、Cl−などを
含む塩泥が排気系外面に付着し、意匠性、耐食性に影響
する。On the other hand, in a salt-damaged environment in which snow-melting salt or the like is sprayed, salt mud containing Cl − or the like adheres to the outer surface of the exhaust system, affecting design and corrosion resistance.
このような環境に適合した排気系材料として、従来から
比較的に耐食性にの良好な普通鋼のアルミめっき鋼板や
Cr含有鋼板などが用いられてきた。As an exhaust system material that is suitable for such an environment, conventional aluminum-plated steel sheets that are relatively good in corrosion resistance and
Cr-containing steel sheets have been used.
（発明が解決しようとする課題） しかし、近年の排ガス規制強化、高性能化に伴い、排気
系環境条件も多様になってきた。また外面の意匠性重視
（赤錆発生防止）や耐久性の向上などの社会的必要性も
高まっている。(Problems to be Solved by the Invention) However, as exhaust gas regulations have been tightened and performance has been improved in recent years, exhaust system environmental conditions have become diverse. In addition, social needs such as emphasis on external design (prevention of red rust) and improvement of durability are increasing.
このような背景に対し、従来の普通鋼の溶融アルミめっ
き鋼板では、端部や厳しい加工を受けた部位で素地が露
出したり、めっき層の損傷が起こり、また鋼の耐食性が
十分でないために、排気系内外面環境において赤錆が発
生しやすく、長時間の使用に耐えられない問題点があ
る。鋼については、従来の5 ％から10％Cr含有鋼板（例
えば特開昭63−143240号公報、特開昭63−143241号公
報）が提案されているが、変化しつつある内面環境や、
塩害地などの外面環境での要求される耐久性に対しては
必ずしも十分でない状況となっている。またCr含有量の
高い場合、局部腐食的になることが明かとなっており、
長時間使用時の局部耐食性に問題がある。Against this background, in the conventional hot-dip aluminized steel sheet of ordinary steel, the base material is exposed at the edges and the site subjected to severe processing, the plating layer is damaged, and the corrosion resistance of the steel is insufficient. However, there is a problem that red rust easily occurs in the environment inside and outside the exhaust system and cannot be used for a long time. Regarding steel, conventional steel sheets containing 5% to 10% Cr (for example, JP-A-63-143240 and JP-A-63-143241) have been proposed, but the changing inner environment and
It is not always sufficient for the required durability in external environments such as salt-damaged areas. Also, it has been revealed that when the Cr content is high, it becomes locally corrosive,
There is a problem with local corrosion resistance after long-term use.
以上のように、これまでの排気系材料は、材料の孔明き
まで含めた寿命において十分な耐久性を得ることはでき
ず、比較的短期間で使用寿命に至るのが現状であり、自
動車の安全性、意匠性、長寿命化の観点から、より優れ
た耐食性材料が望まれている。As described above, the exhaust system materials to date cannot obtain sufficient durability in the life including drilling of the material, and it is the present condition that the service life reaches a relatively short period. From the viewpoints of safety, design, and long life, more excellent corrosion resistant materials are desired.
（課題を解決するための手段） 本発明は、上記のような問題を解決した耐食性に優れた
エンジン排ガス用アルミめっき鋼板を提供するものであ
って、その要旨は、Cr：10〜18.5％、Mo：1.0 〜3.0 ％
の複合添加を基本に、Nb：0.05〜1.0 ％、Ti：0.05〜1.
0 ％の１種または２種含有し、残部が実質的にFeと不可
避的不純物からなる鋼に溶融アルミめっきを施した耐食
性に優れたエンジン排ガス系材料用アルミめっき鋼板で
ある。(Means for Solving the Problems) The present invention is to provide an aluminum-coated steel sheet for engine exhaust gas having excellent corrosion resistance, which solves the above problems, and the gist thereof is Cr: 10 to 18.5%, Mo: 1.0-3.0%
Based on the composite addition of Nb: 0.05 to 1.0%, Ti: 0.05 to 1.
It is an aluminum-plated steel sheet for engine exhaust gas-based materials, which has excellent corrosion resistance, obtained by performing hot-dip aluminum plating on steel containing 0% of 1 type or 2 types and the balance substantially consisting of Fe and inevitable impurities.
これにさらなる耐食性を付与するため、鋼成分としてN
i：0.1 〜1.0 ％、Cu：0.03〜1.0 ％、Ｗ：0.05〜0.5
％、Ｖ：0.05〜0.5 ％、Zr：0.05〜1.0 ％をそれぞれ１
種または２種以上を含有したエンジン排ガス系材料用溶
融アルミめっき鋼板である。In order to add further corrosion resistance to this, N as a steel component
i: 0.1-1.0%, Cu: 0.03-1.0%, W: 0.05-0.5
%, V: 0.05 to 0.5%, Zr: 0.05 to 1.0% respectively 1
It is a hot-dip aluminized steel sheet for engine exhaust gas-type materials containing one or more kinds.
さらに本発明は鋼の局部腐食の発生点となり得るMnS 系
介在物の生成を抑制し、耐食性を改善するためにCa、Ce
をそれぞれ0.001 ％以上0.03％以下で１種または２種含
有せしめたエンジン排ガス系材料用溶融アルミめっき鋼
板である。Furthermore, the present invention suppresses the formation of MnS-based inclusions, which can be the point of local corrosion of steel, and improves the corrosion resistance by using Ca, Ce
Is a hot-dip aluminized steel sheet for engine exhaust gas materials, containing one or two of 0.001% or more and 0.03% or less, respectively.
以下、本発明について詳細に説明する。Hereinafter, the present invention will be described in detail.
まず、転炉、電気炉などで溶製された鋼片を熱間圧延、
酸洗、冷間圧延あるいは鋳造、酸洗、冷間圧延などの工
程を経てめっき原板を製造する。さらにアルミまたはア
ルミ合金めっき浴にて溶融めっきを行う。このようにし
て製造された上記の鋼成分のアルミめっき鋼板を使用す
る。First, hot rolling of steel pieces melted in a converter, electric furnace, etc.
An original plating plate is manufactured through steps such as pickling, cold rolling or casting, pickling and cold rolling. Further, hot dip plating is performed in an aluminum or aluminum alloy plating bath. The aluminum-plated steel sheet having the above steel components produced in this way is used.
この中で鋼成分については、 Ｃは、ステンレス鋼の耐食性に有害であるが、強度の観
点からは、ある程度の含有量は必要である。0.05％を越
えると耐食性は大幅に劣化するために0.05％以下とし
た。Among these, regarding steel components, C is harmful to the corrosion resistance of stainless steel, but a certain amount of content is necessary from the viewpoint of strength. If it exceeds 0.05%, the corrosion resistance is significantly deteriorated, so the content is set to 0.05% or less.
Siは、鋼中に0.6 ％を越えて含有すると、めっき原板表
面に生成したSi系酸化物あるいはFe−Si系酸化物によっ
てアルミめっき浴との反応性を大幅に阻害し、微小不め
っきが多く発生する。この結果、アルミめっきされてい
ない部分が発生し、耐食性、耐熱性などの性能が低下す
る。従って、鋼中Si量は少ないほどよく、本発明におい
ては、Siは0.6 ％以下に、好ましくは0.1 ％以下に抑え
る必要がある。If Si is contained in steel in an amount of more than 0.6%, the reactivity with the aluminum plating bath is greatly hindered by the Si-based oxide or Fe-Si-based oxide formed on the surface of the plating base plate, and micro-non-plating often occurs. Occur. As a result, a portion not plated with aluminum is generated, and performance such as corrosion resistance and heat resistance is deteriorated. Therefore, the smaller the amount of Si in steel, the better. In the present invention, it is necessary to suppress Si to 0.6% or less, preferably 0.1% or less.
Crは、本発明の基本成分である。排気系内外面環境など
の高い耐食性を要求される環境では、Moさらに必要に応
じてNi、Cuなどと共存の形で10％以上の添加が必要であ
る。多いほど鋼の耐食性は向上するが、18.5％を越えて
もその耐食性は飽和する。また溶融めっき時にめっき層
や合金層に鋼からCrが拡散する。この際、鋼中Cr量が10
％以上ではめっき層や合金層の耐食性が大きく向上する
効果が得られ、鋼板全体の寿命に寄与する。Cr is a basic component of the present invention. In environments where high corrosion resistance is required, such as the environment inside and outside the exhaust system, it is necessary to add 10% or more in the form of coexistence with Mo and, if necessary, Ni, Cu, etc. The higher the content, the higher the corrosion resistance of steel, but even if it exceeds 18.5%, the corrosion resistance will be saturated. Further, Cr diffuses from steel into the plating layer and alloy layer during hot dipping. At this time, the Cr content in the steel is 10
% Or more, the effect of significantly improving the corrosion resistance of the plating layer and the alloy layer is obtained, which contributes to the life of the entire steel sheet.
Mnは、排気系内外面環境での耐食性に特別に影響を及ぼ
さないが通常の成分含有量範囲として0.05％以上1.5 ％
以下と規定した。Mn has no special effect on the corrosion resistance in the exhaust system internal / external environment, but as a normal content range of 0.05% to 1.5%
Specified as below.
Moは、Crさらに必要に応じて、Ni、Cuなどと共存の形で
添加し、排気系内外面環境での鋼の局部腐食発生、進展
を抑制するために、またアルミめっき浴との親和性を高
め、めっき欠陥部の発生を抑制し、めっきの耐食性など
の諸性能を有効に発揮させると共に、溶融めっき時に生
成する合金層の耐食性を向上させるのに効果がある。さ
らには溶融めっき時にめっき層に微量含まれるが、この
Moが腐食生成物の中に凝縮され、めっき層の耐食性を向
上させる効果があり、必須の元素である。1.0 ％以上3.
0 ％以下の添加でCrおよびその他の特許請求範囲記載の
各成分（以下その他元素という）との共存で極めて効果
的となる。Mo is added in the form of coexistence with Cr and Ni, Cu, etc., if necessary, in order to suppress the occurrence and development of local corrosion of steel in the exhaust system internal / external surface environment, and has an affinity with the aluminum plating bath. Is effective in suppressing the occurrence of plating defects and effectively exerting various properties such as corrosion resistance of plating, and improving the corrosion resistance of the alloy layer formed during hot dipping. Furthermore, a small amount is contained in the plating layer during hot dip plating.
Mo is an essential element as it is condensed in the corrosion products and has the effect of improving the corrosion resistance of the plating layer. 1.0% or more 3.
Addition of 0% or less becomes extremely effective in coexistence with Cr and other components described in the claims (hereinafter referred to as other elements).
しかし、1.0 ％未満では、溶融めっき時にめっき欠陥部
の発生を十分に抑制できず、その部分を中心とする腐食
が起こりやすく耐食性に大きな影響を及ぼす。また溶融
めっき時に鋼からの拡散によって含有される合金層中の
Mo量が少なくなり合金層の耐食性が十分でない。さらに
めっき層の腐食の際、生成する腐食生成物の耐食性が十
分でなく、鋼板全体の寿命に大きな影響がある。また0.
3 ％を越えても耐食性の改善にはそれほど寄与しない
し、高価となる。However, if it is less than 1.0%, it is not possible to sufficiently suppress the occurrence of plating defects during hot dipping, and corrosion is likely to occur mainly in those parts, which has a significant effect on corrosion resistance. In addition, during hot dip coating
The amount of Mo becomes small and the corrosion resistance of the alloy layer is not sufficient. Furthermore, when the plating layer corrodes, the corrosion resistance of the generated corrosion product is not sufficient, which greatly affects the life of the entire steel sheet. Also 0.
Even if it exceeds 3%, it does not contribute much to the improvement of corrosion resistance and becomes expensive.
鋼中に可溶なAl量が0.005 ％未満では鋼板に表面欠陥を
生じやすい。また、0.1 ％を越えると耐食性、加工性を
劣化させる。またアルミめっき性を低下させ、不めっき
原因となる。従ってAl量としては0.005 〜0.10％鋼中に
残存させる必要がある。If the amount of Al soluble in the steel is less than 0.005%, surface defects are likely to occur on the steel sheet. If it exceeds 0.1%, corrosion resistance and workability are deteriorated. Further, it deteriorates the aluminum plating property and causes non-plating. Therefore, the amount of Al must be 0.005 to 0.10% to remain in the steel.
上記の成分組成以外として、Ｐ、Ｓの含有は、加工性、
耐食性を低下させるのでできるだけ少ないことが好まし
く、Ｐは0.03％以下、Ｓは0.02％であれば本発明上、何
ら支障はない。In addition to the above component composition, the inclusion of P and S results in workability,
It is preferable that the content is as small as possible because it lowers the corrosion resistance. If P is 0.03% or less and S is 0.02%, there is no problem in the present invention.
さらに本発明のアルミめっき鋼板の耐食性などの諸性能
を改善するためにNb、Ti、Niなどを選択的に含有させ
る。Furthermore, in order to improve various properties such as corrosion resistance of the aluminized steel sheet of the present invention, Nb, Ti, Ni, etc. are selectively contained.
NbはＣまたはＮを固定し、ステンレス鋼の耐食性の劣化
を防ぐために添加する。耐食性を向上させるために0.05
％から1.0 ％の範囲で添加する。1.0 ％を越えると加工
性を劣化させる。0.05％未満では効果がない。Nb fixes C or N and is added to prevent deterioration of corrosion resistance of stainless steel. 0.05 to improve corrosion resistance
Add in the range of 1.0 to 1.0%. If it exceeds 1.0%, the workability is deteriorated. Less than 0.05% is ineffective.
Tiは、ＣまたはＮを固定し、ステンレス鋼の耐食性の劣
化を防ぐために添加する。Caと共存してＯを固定し、S
i、Mnの酸化物の生成を抑制し、加工性と耐食性を向上
させる効果がある。0.05％以上1.0 ％以下添加する。1.
0 ％を越えるとその効果が飽和し、経済的でなくなると
共に、加工性を劣化させる。Ti fixes C or N and is added to prevent deterioration of corrosion resistance of stainless steel. Coexists with Ca and fixes O, S
It has the effect of suppressing the formation of oxides of i and Mn and improving workability and corrosion resistance. Add 0.05% or more and 1.0% or less. 1.
If it exceeds 0%, the effect is saturated, it is not economical, and the workability is deteriorated.
なお、上記のTi、Nbは、その１種または２種を添加す
る。Incidentally, one or two of the above Ti and Nb are added.
Niは、本発明ステンレス鋼の選択成分である。凝縮液を
含む環境など高い耐食性を要求される排気系内外面環境
でCr、Moその他元素と共存して用いる。局部腐食進展抑
制に効果的であるが、0.1 ％未満では効果がなく、1.0
％を越えるとその効果は飽和し、また経済的にも高価と
なる。Ni is a selective component of the stainless steel of the present invention. Used in coexistence with Cr, Mo and other elements in exhaust system internal and external environment where high corrosion resistance is required such as environment containing condensate. It is effective in suppressing the local corrosion progress, but less than 0.1% is ineffective and 1.0
If it exceeds%, the effect is saturated and it is economically expensive.
CuはCr、Moをベースとした成分系、さらにNi、その他元
素と共存の形で添加され、排気系内外環境での耐食性を
得るための添加元素である。0.03％以上で共存効果が著
しく、また1.0 ％を越えると耐食性は飽和し、加工性が
劣化する。Cu is an additive element that is added in the form of coexistence with a component system based on Cr and Mo, Ni, and other elements to obtain corrosion resistance in the environment inside and outside the exhaust system. If it exceeds 0.03%, the coexistence effect is remarkable, and if it exceeds 1.0%, the corrosion resistance is saturated and the workability deteriorates.
Ｗの共存効果は、ステンレス鋼の耐食性、局部腐食性を
向上させるためで、必要に応じて0.5 ％以下で添加す
る。0.5 ％を越えるとその効果は飽和する。0.05％未満
では効果はない。The coexisting effect of W is to improve the corrosion resistance and local corrosion resistance of stainless steel, and if necessary, it is added in an amount of 0.5% or less. If it exceeds 0.5%, the effect becomes saturated. If less than 0.05%, there is no effect.
Ｖの共存添加は、ステンレス鋼の耐食性、局部腐食性を
向上させるためで、必要に応じて0.5 ％以下で添加す
る。0.5 ％を越えるとその効果は飽和する。0.05％未満
では効果はない。The coexisting addition of V is to improve the corrosion resistance and local corrosion resistance of stainless steel, and if necessary, it is added in an amount of 0.5% or less. If it exceeds 0.5%, the effect becomes saturated. If less than 0.05%, there is no effect.
Zrの共存添加は、ステンレス鋼の耐食性、局部腐食性を
向上させるために、必要に応じて1.0 ％以下添加する。
1.0 ％を越えるとその効果は飽和する。0.05％未満では
効果はない。Zr is added together in an amount of 1.0% or less as needed to improve the corrosion resistance and local corrosion resistance of stainless steel.
If it exceeds 1.0%, the effect is saturated. If less than 0.05%, there is no effect.
Ca、Ceは低硫黄鋼中でAlと共存してＯを固定し、凝縮液
中での局部腐食の発生起点となり得るMnS 系の介在物の
生成を抑制し、耐食性を改善する。Ca、Ceは、それぞれ
0.001 〜0.03％の範囲で１種または２種が必要に応じて
添加する。Ca and Ce coexist with Al in the low-sulfur steel to fix O, suppress the formation of MnS-based inclusions that can be the starting point of local corrosion in the condensate, and improve the corrosion resistance. Ca and Ce are respectively
If necessary, one or two kinds are added within the range of 0.001 to 0.03%.
浴成分については、アルミめっき鋼板の合金層厚みを制
御するため、浴中にSiを添加するが、Si量が少ないと硬
度の高い合金層が極めて厚くなり、加工時にクラックが
発生しやすく加工時のめっき密着性が低下し、耐食性な
どの諸性能も大きな影響を受ける。しかし、10％以上Cr
を含有する鋼板では、アルミめっき浴との濡れ性が低い
ため、浴温が高い低Si浴は反応性を高める上で有利で、
かつ合金層が厚く生成しにくいため、低Si浴も排気系に
使用できる。浴中Siは合金層の成長抑制に有利である
が、含有量が多くなるとめっき層中のSiが粗大化し、ま
た鍍金層中のSi量も増大してめっき層の硬度が高くな
り、めっき層の加工性は低下する。Regarding bath components, Si is added to the bath in order to control the alloy layer thickness of the aluminized steel sheet.However, if the amount of Si is small, the alloy layer with high hardness becomes extremely thick and cracks easily occur during processing, The plating adhesion of is reduced, and various properties such as corrosion resistance are greatly affected. However, 10% or more Cr
In the steel sheet containing, since the wettability with the aluminum plating bath is low, a low Si bath with a high bath temperature is advantageous in increasing the reactivity,
Moreover, since the alloy layer is thick and difficult to form, a low Si bath can also be used for the exhaust system. Si in the bath is advantageous for suppressing the growth of the alloy layer, but when the content is high, the Si in the plating layer becomes coarse, and the Si content in the plating layer also increases, increasing the hardness of the plating layer and increasing the hardness of the plating layer. The workability of is reduced.
従ってめっき層自体の加工性をそこなわず、耐食性など
の諸性能を低下させないためには、Si量は13％以下が望
ましい。Therefore, the Si content is preferably 13% or less in order not to impair the workability of the plating layer itself and to reduce various properties such as corrosion resistance.
このように製造された本発明のアルミめっき鋼板は、排
気系内外環境において、素地露出部の耐孔明き性が大幅
に向上すると共にアルミめっき層、合金層、鋼の腐食電
位がこの順序で貴となり、アルミめっき層、合金層、に
よるカソードタイプの暴食作用が得られる。さらに鋼中
のCr、Moなどの成分がアルミめっき浴と鋼の反応の際、
めっき層や合金層に含有され、これらの耐食性が向上す
る。従って以上の相乗効果によって鋼の発錆や局部腐食
を抑制でき、耐食性が大幅に向上する。The aluminum-plated steel sheet of the present invention produced in this manner has a significantly improved puncture resistance of the exposed base material in the environment inside and outside the exhaust system, and the corrosion potentials of the aluminum-plated layer, the alloy layer, and the steel are noble in this order. As a result, a cathode type erosion action by the aluminum plating layer and the alloy layer can be obtained. Furthermore, when the components such as Cr and Mo in the steel react with the aluminum plating bath,
It is contained in the plating layer and alloy layer, and the corrosion resistance of these is improved. Therefore, rusting and local corrosion of steel can be suppressed by the above synergistic effect, and the corrosion resistance is significantly improved.
（実施例） 本発明のエンジン排ガス用マフラーの特性を実施例によ
り説明する。(Examples) The characteristics of the engine exhaust muffler of the present invention will be described with reference to Examples.
第１表に、本発明アルミめっき鋼板および比較鋼板の鋼
の化学組成を示す。Table 1 shows the chemical compositions of the steels of the present invention aluminized steel sheet and comparative steel sheet.
本発明のアルミめっき鋼板は真空溶解炉を使用し、第１
表に示した成分組成の鋼を溶製した。インゴットに鋳造
後、通常の加熱条件で熱延し、さらに酸洗、冷間圧延を
行い、板厚0.8 mmの鋼板とした。この板を無酸化炉を使
用する連続ラインにて溶融アルミめっきを行い、めっき
付着量を80ｇ／m2に調整した。The aluminum plated steel sheet of the present invention uses a vacuum melting furnace,
Steel having the composition shown in the table was melted. After casting into an ingot, hot rolling was performed under normal heating conditions, and further pickling and cold rolling were performed to obtain a steel plate having a plate thickness of 0.8 mm. This plate was subjected to hot-dip aluminum plating in a continuous line using an oxidation-free furnace to adjust the coating weight to 80 g / m 2 .
第２表または第３表に排気系外面腐食環境および内面腐
食環境をを想定したラボ試験結果を示す。外面腐食試験
においては、本発明のアルミめっき鋼板は平面部、端部
からの赤錆発生もなく合金層を含んだめっきの耐食性向
上及びめっき層による防食効果が得られた。しかし、め っきのない鋼では赤錆が発生するが、本発明の成分鋼の
腐食は軽微である。内面腐食試験においては、普通鋼ア
ルミめっき鋼板に比較して本発明のアルミめっき鋼板は
合金層を含だめっきの耐食性向上およびめっき層による
防食効果によって非常に良好な耐食性が得られた。めっ
きのない鋼の腐食の程度は、本発明の成分鋼では非常に
軽く耐食性は良好であるが、アルミめっきを行うことに
よってさらに軽微となっている。Tables 2 and 3 show the laboratory test results assuming the exhaust system external corrosion environment and internal corrosion environment. In the outer surface corrosion test, the aluminum-plated steel sheet of the present invention showed the improvement of the corrosion resistance of the plating including the alloy layer and the anticorrosion effect of the plating layer without the generation of red rust from the flat surface portion and the end portion. But Red rust is generated in steel without plating, but the corrosion of the component steel of the present invention is slight. In the internal corrosion test, the aluminum-plated steel sheet of the present invention showed very good corrosion resistance as compared with the ordinary steel aluminum-plated steel sheet due to the improvement of the corrosion resistance of the plating including the alloy layer and the anticorrosion effect of the plating layer. The degree of corrosion of steel without plating is extremely light with the component steel of the present invention and has good corrosion resistance, but it is further reduced with aluminum plating.
なお、上述した第１表の試験方法は次の通りである。The test method of Table 1 described above is as follows.
〔１〕排気系外面腐食試験法 （方法）１サイクル−１日；加熱（450 ℃×29分、大気
雰囲気）→塩水浸漬（27℃×1 分、5 ％NaCl溶液）→乾
燥（70℃×60分）を４回繰り返した後、塩水噴霧（35℃
×18ｈ）を行う。[1] Exhaust system external corrosion test method (method) 1 cycle-1 day; heating (450 ° C × 29 minutes, atmospheric atmosphere) → salt water immersion (27 ° C × 1 minute, 5% NaCl solution) → drying (70 ° C × After repeating 60 minutes 4 times, salt spray (35 ° C)
X 18 h).
上記の腐食試験を70サイクル繰り返した後、腐食減少
量、外観を調べた。After repeating the above corrosion test for 70 cycles, the corrosion reduction amount and the appearance were examined.
〔２〕排気系内面腐食試験法 （方法）１サイクル−１週間；→→→→→
の順を１サイクルとする。[2] Exhaust system internal corrosion test method (method) 1 cycle-1 week; → → → → →
The order of is one cycle.
加熱（300 ℃×30分）→2/3 浸漬（80℃×150 分、pH
8 溶液）を２回繰り返す。Heating (300 ℃ × 30 minutes) → 2/3 immersion (80 ℃ × 150 minutes, pH
8 solution) is repeated twice.
乾燥（100 ℃×24時間） 2/3 浸漬（80℃×24時間、pH3 ） 乾燥（100 ℃×24時間） 2/3 浸漬（80℃×24時間、pH8 ） 大気中に放置（27℃×66時間） 上記の腐食試験を20サイクル繰り返した後、最大板厚減
少量（mm）を測定した。Drying (100 ° C x 24 hours) 2/3 Immersion (80 ° C x 24 hours, pH3) Drying (100 ° C x 24 hours) 2/3 Immersion (80 ° C x 24 hours, pH8) Leave in the air (27 ° C x 66 hours) After repeating the above corrosion test for 20 cycles, the maximum reduction in plate thickness (mm) was measured.
（溶液）基本成分 SO４ 2-：1000ppm 、NO３ −：150 ppm 、Cl−：300 ppm
、CO３ 2-：4000ppm 、NH４ ＋：3000ppm 、HCOOH ：100
0ppm 、CH３COOH：1000ppm この基本成分にアンモニア水または硫酸のいずれか一方
を添加してpHを８または３に調整する。(Solution) Basic components SO 4 2- : 1000 ppm, NO 3 − : 150 ppm, Cl − : 300 ppm
, CO 3 2- : 4000ppm, NH 4 + : 3000ppm, HCOOH: 100
0ppm, CH 3 COOH: 1000ppm Add either ammonia water or sulfuric acid to this basic component to adjust the pH to 8 or 3.
〔３〕アルミめっき付着量 80ｇ／m2とした。[3] The amount of aluminum plating deposited was 80 g / m 2 .
（発明の効果） 以上のように本発明鋼板は、十分な耐食性を有し、また
長期間の使用に耐え、しかも意匠性にも優れている。従
って、自動車エンジン排気系材料として好適である。(Effects of the Invention) As described above, the steel sheet of the present invention has sufficient corrosion resistance, withstands long-term use, and is also excellent in design. Therefore, it is suitable as an automobile engine exhaust system material.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 冨田 稔 福岡県北九州市八幡東区枝光１―１―１ 新日本製鐵株式会社八幡製鐵所内 (56)参考文献 特開 昭60−13059（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Minoru Tomita Minorita 1-1-1 Yamitsu, Yawatahigashi-ku, Kitakyushu City, Fukuoka Prefecture (56) Reference, JPN 60-13059 (JP) , A)
Claims (3)
残部がFeと不可避的不純物からなる鋼に溶融アルミめっ
きすることを特徴とする耐食性の優れたエンジン排ガス
系材料用アルミめっき鋼板。1. By weight%, C: 0.05% or less, Si: 0.6% or less, Mn: 0.05 to 1.5%, Cr: 10 to 18.5%, Mo: 1.0 to 3.0%, Al: 0.005 to 0.1%, and Ti: 0.05 to 1.0%, Nb: 0.05 to 1.0% each containing one or two kinds,
An aluminum-plated steel sheet for engine exhaust gas materials with excellent corrosion resistance, characterized by hot-dip aluminum plating on the balance balance of Fe and inevitable impurities.
たさらに、 Ni：0.1 〜1.0 ％、 Cu：0.03〜1.0 ％、 Ｗ：0.05〜0.5 ％、 Ｖ：0.05〜0.5 ％、 Zr：0.05〜1.0 ％をそれぞれ１種または２種以上含有
し、残部がFeと不可避的不純物からなる鋼に溶融アルミ
めっきすることを特徴とする耐食性の優れたエンジン排
ガス系材料用アルミめっき鋼板。2. By weight%, C: 0.05% or less, Si: 0.6% or less, Mn: 0.05 to 1.5%, Cr: 10 to 18.5%, Mo: 1.0 to 3.0%, Al: 0.005 to 0.1%, and Ti: 0.05 to 1.0% and Nb: 0.05 to 1.0% are respectively contained in one or two kinds, and further, Ni: 0.1 to 1.0%, Cu: 0.03 to 1.0%, W: 0.05 to 0.5%, V: 0.05. ~ 0.5%, Zr: 0.05 ~ 1.0% each of 1 type or 2 types or more, the balance is Fe and unavoidable impurities, and hot-dip aluminized steel made of steel and unavoidable impurities. Aluminized steel sheet.
ぞれ0.001 〜0.03％で１種または２種含有することを特
徴とする請求項（１）または（２）記載の耐食性の優れ
たエンジン排ガス系材料用アルミめっき鋼板。3. The engine exhaust gas with excellent corrosion resistance according to claim 1, further comprising one or two of Ca or Ce as a steel component in an amount of 0.001 to 0.03%, respectively. Aluminum-plated steel sheet for base materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2077517A JPH0660380B2 (en) | 1990-03-27 | 1990-03-27 | Aluminum plated steel sheet for engine exhaust gas materials with excellent corrosion resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2077517A JPH0660380B2 (en) | 1990-03-27 | 1990-03-27 | Aluminum plated steel sheet for engine exhaust gas materials with excellent corrosion resistance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03277761A JPH03277761A (en) | 1991-12-09 |
| JPH0660380B2 true JPH0660380B2 (en) | 1994-08-10 |
Family
ID=13636160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2077517A Expired - Fee Related JPH0660380B2 (en) | 1990-03-27 | 1990-03-27 | Aluminum plated steel sheet for engine exhaust gas materials with excellent corrosion resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0660380B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2695438B1 (en) * | 1992-09-09 | 1994-11-18 | Lorraine Laminage | Connection device between two parts, in particular of a motor vehicle exhaust line. |
| JP2004244655A (en) * | 2003-02-12 | 2004-09-02 | Nippon Steel Corp | HOT DIP Al BASED PLATED STEEL SHEET HAVING EXCELLENT CORROSION RESISTANCE, AND PRODUCTION METHOD THEREFOR |
| JP2009035755A (en) | 2007-07-31 | 2009-02-19 | Nisshin Steel Co Ltd | Al-PLATED STEEL SHEET FOR EXHAUST GAS PASSAGEWAY MEMBER OF MOTORCYCLE AND MEMBER |
| JP2009035756A (en) | 2007-07-31 | 2009-02-19 | Nisshin Steel Co Ltd | Al-PLATED STEEL SHEET FOR EXHAUST GAS PASSAGEWAY MEMBER OF MOTORCYCLE EXCELLENT IN HIGH-TEMPERATURE STRENGTH AND THE GAS PASSAGE WAY MEMBER USING THE STEEL SHEET |
| JP6452351B2 (en) * | 2014-08-28 | 2019-01-16 | 山陽特殊製鋼株式会社 | Stainless steel with excellent acid resistance |
| CN109196131B (en) * | 2016-05-30 | 2021-06-01 | 杰富意钢铁株式会社 | Ferritic stainless steel sheet |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5113465B2 (en) * | 1972-10-12 | 1976-04-28 | ||
| JPS508010A (en) * | 1973-05-28 | 1975-01-28 | ||
| JPH0226643A (en) * | 1988-07-15 | 1990-01-29 | Nisshin Steel Co Ltd | Catalyst carrier |
-
1990
- 1990-03-27 JP JP2077517A patent/JPH0660380B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03277761A (en) | 1991-12-09 |
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