JPH055912B2 - - Google Patents
Info
- Publication number
- JPH055912B2 JPH055912B2 JP21771587A JP21771587A JPH055912B2 JP H055912 B2 JPH055912 B2 JP H055912B2 JP 21771587 A JP21771587 A JP 21771587A JP 21771587 A JP21771587 A JP 21771587A JP H055912 B2 JPH055912 B2 JP H055912B2
- Authority
- JP
- Japan
- Prior art keywords
- plating
- silica
- zinc
- steel sheet
- plated
- 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
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- 238000007747 plating Methods 0.000 claims description 56
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 35
- 229910000831 Steel Inorganic materials 0.000 claims description 30
- 239000010959 steel Substances 0.000 claims description 30
- 239000000377 silicon dioxide Substances 0.000 claims description 16
- -1 nitrate ions Chemical class 0.000 claims description 13
- 230000002378 acidificating effect Effects 0.000 claims description 12
- 239000011701 zinc Substances 0.000 claims description 12
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 11
- 238000005260 corrosion Methods 0.000 claims description 11
- 230000007797 corrosion Effects 0.000 claims description 11
- 229910052725 zinc Inorganic materials 0.000 claims description 11
- 229910002651 NO3 Inorganic materials 0.000 claims description 10
- 239000006185 dispersion Substances 0.000 claims description 10
- 239000008119 colloidal silica Substances 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 229910001297 Zn alloy Inorganic materials 0.000 claims description 4
- 229910001335 Galvanized steel Inorganic materials 0.000 claims description 3
- 239000008397 galvanized steel Substances 0.000 claims description 3
- 150000002500 ions Chemical class 0.000 claims description 2
- 230000007423 decrease Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 229910021645 metal ion Inorganic materials 0.000 description 5
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 4
- 238000005282 brightening Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000010960 cold rolled steel Substances 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 229920002873 Polyethylenimine Polymers 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000004070 electrodeposition Methods 0.000 description 2
- KWIUHFFTVRNATP-UHFFFAOYSA-N glycine betaine Chemical compound C[N+](C)(C)CC([O-])=O KWIUHFFTVRNATP-UHFFFAOYSA-N 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 102100036092 Alpha-endosulfine Human genes 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 101000876352 Homo sapiens Alpha-endosulfine Proteins 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 150000001413 amino acids Chemical class 0.000 description 1
- 229960003237 betaine Drugs 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- KFZAUHNPPZCSCR-UHFFFAOYSA-N iron zinc Chemical compound [Fe].[Zn] KFZAUHNPPZCSCR-UHFFFAOYSA-N 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- QELJHCBNGDEXLD-UHFFFAOYSA-N nickel zinc Chemical compound [Ni].[Zn] QELJHCBNGDEXLD-UHFFFAOYSA-N 0.000 description 1
- 229940005654 nitrite ion Drugs 0.000 description 1
- 229910017464 nitrogen compound Inorganic materials 0.000 description 1
- 150000002830 nitrogen compounds Chemical class 0.000 description 1
- 239000006179 pH buffering agent Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 229920001281 polyalkylene Polymers 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- JUJWROOIHBZHMG-UHFFFAOYSA-N pyridine Substances C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 1
- 125000001453 quaternary ammonium group Chemical group 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- CVHZOJJKTDOEJC-UHFFFAOYSA-N saccharin Chemical compound C1=CC=C2C(=O)NS(=O)(=O)C2=C1 CVHZOJJKTDOEJC-UHFFFAOYSA-N 0.000 description 1
- 229940081974 saccharin Drugs 0.000 description 1
- 235000019204 saccharin Nutrition 0.000 description 1
- 239000000901 saccharin and its Na,K and Ca salt Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 235000010344 sodium nitrate Nutrition 0.000 description 1
- 239000004317 sodium nitrate Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Electroplating And Plating Baths Therefor (AREA)
- Electroplating Methods And Accessories (AREA)
Description
〔産業上の利用分野〕
この発明は、耐食性に優れ、且つ、めつき面に
美麗な光沢を有する、高耐食・光沢亜鉛系分散め
つき鋼板の製造方法に関するものである。
〔従来の技術〕
従来より、電気亜鉛めつき鋼板のめつき面に光
沢を付与する試みは、数多く行なわれている。こ
れらのほとんどは、有機系の光沢剤を亜鉛めつき
浴中に添加するものである。例えば、特開昭53−
137833号ではポリアルキレンアミンと有機第４ア
ンモニウムハロゲン化物を、特開昭61−9593号で
はポリエチレンイミン変成物を、特開昭61−
204387号ではアミノ酸を、それぞれ光沢剤として
使用して添加している。
一方、合金系めつきでは、特開昭55−107794号
のように、サツカリン、アリルスルホネート並び
にピリジン第４アンモニウム、ベタイン等を光沢
剤として使用する光沢ニツケル−鉄合金めつき、
特開昭60−96787号のように、DDS、ENSA、
EN等を添加して行なう光沢鉄−亜鉛合金めつ
き、特開昭55−131193号のように、SrSO4を添加
して行なう光沢亜鉛−ニツケル合金めつきなどが
挙げられる。
他方、光沢剤を用いない光沢化手段としては、
特開昭61−166992号のように、被めつき鋼板表面
のフエライト結晶粒度および伸展率を規定するも
の、特開昭61−205129号のように、被めつき鋼板
の表面粗さを規定するものなどが挙げられる。
以上のうち、光沢剤を使用する方法では、めつ
き浴中の一部の光沢剤がめつき金属イオンと反応
して、その結果めつき浴内に沈殿物を形成させる
ことがある。このような沈殿物はめつき浴中のめ
つき金属イオン濃度を変化させ、めつき浴バラン
ス等の管理を困難にさせるばかりでなく、めつき
鋼板上に付着することなどにより、めつき面の品
質を著しく劣化させる。
光沢剤を使用しない方法では、被めつき鋼板の
結晶粒度調整、あるいは表面粗さを極力抑えるた
めに、鋼板の熱処理条件および圧延条件を正確に
選択しなければならない。このような条件は作業
を複雑化させ、被めつき鋼板の製造コスト上昇を
招くばかりか、被めつき鋼板表面の不均一性がそ
のままめつき面に反映されることになり、光沢ム
ラ等の不良発生率が高い。
〔発明が解決しようとする問題点〕
ところで、シリカ（SiO2）などの酸化物粒子
を金属イオンと共に共析させることにより、高い
耐食性を持たせた、所謂分散めつきが知られてい
る。しかしながら、分散めつきの光沢化について
は未だ報告がなく、例をみない。
分散めつきでは、一般に酸化物粒子の共析率を
高めるほど電着不良を起こし易い。これは、還元
されてめつき層を形成するめつき金属イオンに対
して、酸化物粒子は単にめつき金属イオンにまぎ
れ込んで析出するという分散めつき特有の傾向で
ある。このような電着不良により、分散めつきで
はめつき外観が損われ、めつき面の光沢化が得ら
れないでいた。
この発明は、上述の現状に鑑み、耐食性の高い
亜鉛−シリカ分散めつき自体によりめつき外観に
光沢を持たせた、耐食性に優れ、且つ、めつき面
に美麗な光沢を有する、高耐食・光沢亜鉛系分散
めつき鋼板を製造することを目的とするものであ
る。
〔問題点を解決するための手段〕
この発明は、非めつき鋼板、亜鉛めつき鋼板お
よび亜鉛合金めつき鋼板のうちのいずれか１つの
鋼板を、シリカを含有した酸性亜鉛−シリカめつ
き浴を用いて電解することにより、前記鋼板の表
面上にシリカを分散共析させた亜鉛系分散めつき
層を形成する、亜鉛系分散めつき鋼板の製造方法
において、
前記酸性亜鉛−シリカめつき浴として、コロイ
ダルシリカを含有し、且つ、硝酸イオンを浴中イ
オン濃度3000〜20000ppmで含有した、酸性亜鉛
−シリカめつき浴を用いることに特徴を有するも
のである。
即ち、この発明は、耐食性に優れた亜鉛−シリ
カ分散めつき鋼板のめつき面に光沢を付与し、そ
の価値を高めたものである。この発明では特殊な
光沢剤を用いない。コロイダルシリカと適当量の
硝酸イオン（NO3 -）を含有した酸性亜鉛−シリ
カめつき浴を用いて電解し、鋼板にめつきすれば
よい。
以下、この発明の製造方法について詳述する。
この発明では、被めつき鋼板として、冷延鋼板
からなる非めつき鋼板の他、亜鉛めつき鋼板、亜
鉛合金めつき鋼板を使用することができ、更には
その他の表面処理鋼板を使用することができる。
この発明では、基本の酸性亜鉛めつき浴にコロ
イダルシリカと硝酸イオンを含有させた酸性亜鉛
−シリカめつき浴を使用する。基本の酸性亜鉛め
つき浴としては特に規定はないが、極く一般的な
硫酸浴、塩化浴あるいはこれらの混合浴などが使
用できる。勿論、PH緩衝剤、電導度補助剤等の添
加物を加えることは差支えない。
PHはこの発明の特に規定するところではない
が、コロイダルシリカの安定性からPH4.5を超え
ることは好ましくなく、またPH１未満でも電流効
率の低下が著しいことから好ましくない。作業性
の点から最も好ましい範囲を掲げるならば、PH１
〜３である。
めつき浴中のコロイダルシリカの濃度として
は、固形分で0.5〜100ｇ／が好ましい。コロイ
ダルシリカの濃度が0.5ｇ／未満では、シリカ
の共析効率が低く、一方100ｇ／を超えると、
浴抵抗の上昇等により電流効率の低下をきたし、
更には浴寿命の低下を招く。
めつき浴中の硝酸イオン濃度は、3000〜
20000ppmが好ましい。硝酸イオン濃度が
3000ppm未満では、めつき外観に得られる光沢度
が不充分であり、一方20000ppmを超えると、め
つき層の密着性が低下する。硝酸イオン
（NO3 -）としては、Zn（NO3）2、NaNO3、
KNO3、HNO3など様々な形でめつき浴中に添加
することが可能である。なお、亜硝酸イオン
（NO2 -）もめつき浴中で容易に酸化されて硝酸
イオンとなるので、同様の効果が期待できる。そ
の場合、亜硝酸イオンの添加量は上述の硝酸イオ
ンと当量分であることが適当である。
電流密度については特に規定しないが、低電流
密度ではめつき効率の低下が問題となり、まため
つき面の光沢も若干減少する傾向にある。高電流
密度でのめつき焼け等を考慮すると、その好まし
い範囲は40〜150A／ｄm2である。
この発明でめつき面に優れた光沢が得られる理
由は詳しくは明らかではないが、次のように推定
される。即ち、硝酸イオンには分散めつきにおい
てシリカ（SiO2）を効率良く均一に析出させる
作用がある。しかも、このとき硝酸イオンまたは
その還元生成物である窒素化合物が、亜鉛−シリ
カ分散めつき層中に取り込まれることで、亜鉛結
晶粒とシリカ粒子との間の不整合性を緩和する。
このため、めつき層は微細結晶化され、平滑性が
向上するので、めつき面に高度の光沢が得られ
る。さらに、高電流密度でめつきを行なつた場
合、電着核の生成数は増加し、同時に結晶粒成長
は抑制される。また、低PHのめつき浴を用いてめ
つきを行なつた場合、電流効率が多少犠牲にはな
るものの、水素発生の活性点がカソードである被
めつき鋼板の表面上に均一に分散される。従つ
て、これらの場合は、めつき層の微細結晶化がよ
り増し、平滑性が一段と向上するので、めつき面
により高度の光沢が得られるようになる。
〔実施例〕
この発明のめつき条件に従い、冷延鋼板に電解
により亜鉛−シリカ分散めつきを施して、本発明
めつき鋼板No.１〜５を製造した。比較のために、
この発明の条件から外れた条件で、冷延鋼板に電
解により亜鉛−シリカ分散めつきを施して、比較
めつき鋼板No.６〜７を製造した。
酸性亜鉛−シリカめつき浴は、ZuSO4・
7H2O：500ｇ／、Na2SO4：30ｇ／、
CH3COONa：15ｇ／を含む酸性亜鉛めつき浴
を基本浴とし、これにコロイダルシリカおよび硝
酸イオンを種々の濃度に含有させたものを使用し
た。コロイダルシリカはスノーテツクス−Ｏ（日
産化学製）を、硝酸イオンについては硝酸ソーダ
を用いた。
めつき浴中の硝酸イオン（NO3 -）やシリカ
（SiO2）の濃度等めつき条件と、得られためつき
鋼板のめつき面外観等の結果とを、第１表に示
す。なお、第１表において、耐食性は塩水噴霧試
験での赤錆発明までの時間を示す。
[Industrial Field of Application] The present invention relates to a method for manufacturing a highly corrosion-resistant and bright zinc-based dispersion-plated steel sheet that has excellent corrosion resistance and a beautiful gloss on the plated surface. [Prior Art] Many attempts have been made to impart gloss to the plated surface of electrogalvanized steel sheets. Most of these involve adding organic brighteners to the galvanizing bath. For example, JP-A-53-
No. 137833 uses polyalkylene amine and organic quaternary ammonium halide, JP-A-61-9593 uses modified polyethyleneimine, and JP-A-61-9593 uses modified polyethyleneimine.
In No. 204387, amino acids are added as brighteners. On the other hand, in alloy plating, as in JP-A-55-107794, bright nickel-iron alloy plating using saccharin, allyl sulfonate, quaternary ammonium pyridine, betaine, etc. as brighteners,
As in JP-A-60-96787, DDS, ENSA,
Examples include bright iron-zinc alloy plating performed by adding EN or the like, and bright zinc-nickel alloy plating performed by adding SrSO 4 as in JP-A-55-131193. On the other hand, as a glossing method that does not use a brightening agent,
As in JP-A No. 61-166992, the ferrite crystal grain size and elongation rate of the coated steel sheet surface are specified, and as in JP-A-61-205129, the surface roughness of the coated steel sheet is specified. Examples include things. Among the methods described above, in the method using a brightener, some of the brightener in the plating bath may react with the plating metal ions, resulting in the formation of a precipitate in the plating bath. Such precipitates not only change the plating metal ion concentration in the plating bath, making it difficult to manage the plating bath balance, but also deteriorate the quality of the plated surface by adhering to the plated steel plate. significantly deteriorates. In a method that does not use brighteners, heat treatment conditions and rolling conditions for the steel plate must be accurately selected in order to adjust the grain size of the coated steel plate or to minimize surface roughness. Such conditions not only complicate the work and increase the manufacturing cost of the plated steel plate, but also cause non-uniformities on the surface of the plated steel plate to be reflected directly on the plated surface, resulting in uneven gloss and other problems. High defect rate. [Problems to be Solved by the Invention] By the way, so-called dispersion plating is known in which high corrosion resistance is imparted by eutectoiding oxide particles such as silica (SiO 2 ) with metal ions. However, there have been no reports yet on the glossiness of dispersed plating, and no examples have been seen yet. In dispersion plating, generally the higher the eutectoid rate of oxide particles, the more likely electrodeposition defects will occur. This is a tendency peculiar to dispersion plating in which the oxide particles simply mix with the plating metal ions and precipitate, whereas the plating metal ions are reduced to form a plating layer. Due to such defective electrodeposition, the appearance of the plated plated by dispersion plating was impaired, and the plated surface could not be made glossy. In view of the above-mentioned current situation, this invention has been developed to provide a highly corrosion-resistant, highly corrosion-resistant product that has a glossy plating appearance due to highly corrosion-resistant zinc-silica dispersion plating itself, and has excellent corrosion resistance and a beautiful luster on the plated surface. The purpose is to manufacture bright zinc-based dispersion plated steel sheets. [Means for Solving the Problems] The present invention provides for applying any one of a non-plated steel sheet, a galvanized steel sheet and a zinc alloy coated steel sheet to an acidic zinc-silica plating bath containing silica. In the method for producing a zinc-based dispersion plated steel sheet, the method comprises forming a zinc-based dispersion plated layer in which silica is dispersed and co-deposited on the surface of the steel sheet by electrolyzing using the acidic zinc-silica plating bath. It is characterized by using an acidic zinc-silica plating bath containing colloidal silica and nitrate ions at an ion concentration of 3000 to 20000 ppm. That is, this invention imparts gloss to the plated surface of a zinc-silica dispersion plated steel sheet with excellent corrosion resistance, thereby increasing its value. This invention does not use any special brighteners. A steel plate may be plated by electrolysis using an acidic zinc-silica plating bath containing colloidal silica and an appropriate amount of nitrate ions (NO 3 − ). The manufacturing method of the present invention will be described in detail below. In this invention, as the coated steel plate, in addition to a non-plated cold-rolled steel plate, a galvanized steel plate or a zinc alloy coated steel plate can be used, and furthermore, other surface-treated steel plates can be used. I can do it. In this invention, an acidic zinc-silica plating bath is used in which colloidal silica and nitrate ions are added to the basic acidic zinc plating bath. Although there are no particular regulations regarding the basic acidic zinc plating bath, the very common sulfuric acid bath, chloride bath, or a mixed bath thereof can be used. Of course, additives such as PH buffering agents and conductivity aids may be added. Although the PH is not particularly defined in this invention, it is not preferable for the PH to exceed 4.5 due to the stability of colloidal silica, and it is also not preferable for the PH to be less than 1 because the current efficiency decreases significantly. If we were to choose the most preferable range from the point of view of workability, it would be PH1.
~3. The concentration of colloidal silica in the plating bath is preferably 0.5 to 100 g/solid content. When the concentration of colloidal silica is less than 0.5 g/, the eutectoid efficiency of silica is low, while when it exceeds 100 g/
Current efficiency decreases due to increased bath resistance, etc.
Furthermore, this results in a decrease in bath life. The nitrate ion concentration in the plating bath is 3000~
20000ppm is preferred. Nitrate ion concentration
If it is less than 3,000 ppm, the glossiness obtained in the plating appearance will be insufficient, while if it exceeds 20,000 ppm, the adhesion of the plating layer will decrease. Nitrate ions (NO 3 - ) include Zn(NO 3 ) 2 , NaNO 3 ,
It can be added to the plating bath in various forms such as KNO 3 and HNO 3 . Note that nitrite ions (NO 2 − ) are also easily oxidized to nitrate ions in the plating bath, so a similar effect can be expected. In that case, it is appropriate that the amount of nitrite ion added is equivalent to the above-mentioned nitrate ion. Although the current density is not particularly specified, a low current density causes a problem of a decrease in plating efficiency, and the gloss of the plating surface also tends to decrease slightly. Considering plating and burning due to high current density, the preferred range is 40 to 150 A/dm 2 . Although the reason why the present invention provides excellent gloss on the plated surface is not clear in detail, it is presumed as follows. That is, nitrate ions have the effect of efficiently and uniformly precipitating silica (SiO 2 ) during dispersion plating. Moreover, at this time, nitrate ions or nitrogen compounds that are their reduction products are incorporated into the zinc-silica dispersed plating layer, thereby alleviating the mismatch between the zinc crystal grains and the silica particles.
Therefore, the plating layer is finely crystallized and its smoothness is improved, so that a high degree of gloss can be obtained on the plating surface. Furthermore, when plating is performed at a high current density, the number of electrodeposited nuclei increases and at the same time, crystal grain growth is suppressed. Furthermore, when plating is performed using a plating bath with a low pH, the active points for hydrogen generation are uniformly distributed on the surface of the plated steel sheet, which is the cathode, although the current efficiency is sacrificed to some extent. Ru. Therefore, in these cases, the fine crystallization of the plated layer is further increased, and the smoothness is further improved, so that a higher level of gloss can be obtained from the plated surface. [Example] According to the plating conditions of the present invention, cold-rolled steel sheets were electrolytically plated with zinc-silica dispersion to produce plated steel sheets Nos. 1 to 5 of the present invention. For comparison,
Comparative plated steel sheets Nos. 6 and 7 were produced by subjecting cold-rolled steel sheets to electrolytic zinc-silica dispersion plating under conditions different from those of the present invention. The acidic zinc-silica plating bath is ZuSO4 .
7H 2 O: 500g/, Na 2 SO 4 : 30g/,
The basic bath was an acidic zinc plating bath containing 15 g of CH 3 COONa, and various concentrations of colloidal silica and nitrate ions were used. Snotex-O (manufactured by Nissan Chemical) was used as colloidal silica, and sodium nitrate was used as nitrate ion. Table 1 shows the plating conditions such as the concentration of nitrate ions (NO 3 − ) and silica (SiO 2 ) in the plating bath, and the results such as the appearance of the plated surface of the obtained matted steel sheets. In Table 1, corrosion resistance indicates the time until red rust appears in the salt spray test.
この発明によれば、従来用いられてきたような
特殊な光沢剤を用いずに、めつき鋼板のめつき面
に光沢が得られるので、光沢剤によるめつき浴の
汚染、寿命低下が防げる。
また、単なる光沢めつきと異なり優れた耐食性
を有し、特にシリカの作用でめつき層の硬度が上
昇していることもあつて、めつき面がキズ付きに
くく、しかも通常の電気亜鉛めつき鋼板に比べる
と、手垢などが付着してもそれが目立ちにくい。
めつき面の潤滑性の向上も期待でき、更に塗装し
て使用する場合には、めつき面の優れた平滑性の
ために塗膜厚を薄膜化しても美麗な塗装外観を得
ることができる。
According to the present invention, gloss can be obtained on the plated surface of a plated steel sheet without using a special brightening agent that has been conventionally used, so that contamination of the plating bath and reduction in service life due to the brightening agent can be prevented. In addition, unlike simple gloss plating, it has excellent corrosion resistance, and because the hardness of the plating layer has increased due to the action of silica, the plated surface is less likely to be scratched, and it is even better than ordinary electrogalvanized plating. Compared to steel plates, it is less noticeable even if dirt from your hands gets on it.
It can also be expected to improve the lubricity of the plated surface, and when used after painting, it is possible to obtain a beautiful painted appearance even if the coating thickness is thinned due to the excellent smoothness of the plated surface. .
Claims (1)
金めつき鋼板のうちのいずれか１つの鋼板を、シ
リカを含有した酸性亜鉛−シリカめつき浴を用い
て電解することにより、前記鋼板の表面上にシリ
カを分散共析させた亜鉛系分散めつき層を形成す
る、亜鉛系分散めつき鋼板の製造方法において、 前記酸性亜鉛−シリカめつき浴として、コロイ
ダルシリカを含有し、且つ、硝酸イオンを浴中イ
オン濃度3000〜20000ppmで含有した、酸性亜鉛
−シリカめつき浴を用いることを特徴とする、高
耐食・光沢亜鉛系分散めつき鋼板の製造方法。[Claims] 1. By electrolyzing any one of a non-plated steel sheet, a galvanized steel sheet and a zinc alloy coated steel sheet using an acidic zinc-silica plating bath containing silica. , in the method for producing a zinc-based dispersion plated steel sheet, which forms a zinc-based dispersion plated layer in which silica is dispersed and co-deposited on the surface of the steel sheet, wherein the acidic zinc-silica plating bath contains colloidal silica. A method for producing a highly corrosion-resistant and bright zinc-based dispersion-plated steel sheet, which is characterized by using an acidic zinc-silica plating bath containing nitrate ions at an ion concentration of 3,000 to 20,000 ppm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21771587A JPS6462498A (en) | 1987-08-31 | 1987-08-31 | Production of bright zinc dispersion plated steel sheet having high corrosion resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21771587A JPS6462498A (en) | 1987-08-31 | 1987-08-31 | Production of bright zinc dispersion plated steel sheet having high corrosion resistance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6462498A JPS6462498A (en) | 1989-03-08 |
| JPH055912B2 true JPH055912B2 (en) | 1993-01-25 |
Family
ID=16708602
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21771587A Granted JPS6462498A (en) | 1987-08-31 | 1987-08-31 | Production of bright zinc dispersion plated steel sheet having high corrosion resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6462498A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03247796A (en) * | 1990-02-23 | 1991-11-05 | Nkk Corp | Steel sheet having silica combined coating and its production |
| JPH03260092A (en) * | 1990-03-08 | 1991-11-20 | Nkk Corp | Production of zinc-silica composite electroplated steel sheet |
| US5186812A (en) * | 1990-03-08 | 1993-02-16 | Nkk Corporation | Method for manufacturing zinc-silica composite electroplated steel sheet |
-
1987
- 1987-08-31 JP JP21771587A patent/JPS6462498A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6462498A (en) | 1989-03-08 |
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|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |