JPS62267497A - Pustproof steel sheet for painting by cationic electrodeposition and its manufacture - Google Patents
Pustproof steel sheet for painting by cationic electrodeposition and its manufactureInfo
- Publication number
- JPS62267497A JPS62267497A JP11123586A JP11123586A JPS62267497A JP S62267497 A JPS62267497 A JP S62267497A JP 11123586 A JP11123586 A JP 11123586A JP 11123586 A JP11123586 A JP 11123586A JP S62267497 A JPS62267497 A JP S62267497A
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- cationic electrodeposition
- feo
- composition consisting
- electrodeposition coating
- 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.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 48
- 239000010959 steel Substances 0.000 title claims abstract description 48
- 238000004070 electrodeposition Methods 0.000 title claims abstract description 25
- 125000002091 cationic group Chemical group 0.000 title claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 title claims description 4
- 238000010422 painting Methods 0.000 title 1
- 229910000640 Fe alloy Inorganic materials 0.000 claims abstract description 13
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 238000007747 plating Methods 0.000 claims abstract description 7
- 239000011248 coating agent Substances 0.000 claims description 27
- 238000000576 coating method Methods 0.000 claims description 27
- 238000001556 precipitation Methods 0.000 claims description 5
- 239000007864 aqueous solution Substances 0.000 claims description 4
- 230000001376 precipitating effect Effects 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 abstract description 24
- 230000007797 corrosion Effects 0.000 abstract description 24
- 235000002639 sodium chloride Nutrition 0.000 abstract description 10
- 150000003839 salts Chemical class 0.000 abstract description 7
- 230000007547 defect Effects 0.000 abstract description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 abstract description 3
- 239000011780 sodium chloride Substances 0.000 abstract description 3
- 239000002245 particle Substances 0.000 abstract description 2
- ACVYVLVWPXVTIT-UHFFFAOYSA-N phosphinic acid Chemical compound O[PH2]=O ACVYVLVWPXVTIT-UHFFFAOYSA-N 0.000 abstract description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 abstract 2
- 229910003953 H3PO2 Inorganic materials 0.000 abstract 1
- 229910021577 Iron(II) chloride Inorganic materials 0.000 abstract 1
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 238000000151 deposition Methods 0.000 abstract 1
- 230000008014 freezing Effects 0.000 abstract 1
- 238000007710 freezing Methods 0.000 abstract 1
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 abstract 1
- 239000003973 paint Substances 0.000 description 9
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 7
- 239000000758 substrate Substances 0.000 description 7
- 229910052725 zinc Inorganic materials 0.000 description 7
- 239000011701 zinc Substances 0.000 description 7
- 229910001335 Galvanized steel Inorganic materials 0.000 description 6
- 239000010960 cold rolled steel Substances 0.000 description 6
- 239000008397 galvanized steel Substances 0.000 description 6
- 239000007921 spray Substances 0.000 description 5
- 229910001297 Zn alloy Inorganic materials 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 229910019142 PO4 Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 3
- 239000010452 phosphate Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910000905 alloy phase Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000005238 degreasing Methods 0.000 description 2
- 238000009713 electroplating Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 239000002987 primer (paints) Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910007567 Zn-Ni Inorganic materials 0.000 description 1
- 229910007614 Zn—Ni Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000002528 anti-freeze Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
Abstract
Description
【発明の詳細な説明】
ク ｆｉ ｎＩ′ｌ ｎｌ デｔ ｋｍ Ｉ
ｓ ！Ｍ ｎｎ（産業上の利用分野）
本発明は自動車の車体や部材に使用するＺｎ−Ｆｅ合金
めっき鋼板のカチオン電着塗装におけるピンホール状の
欠陥発生を少（した防錆鋼板に関する。[Detailed description of the invention] k fi nI'l nl det km I
S! Mnn (Industrial Application Field) The present invention relates to a rust-preventing steel sheet that reduces the occurrence of pinhole-like defects in cationic electrodeposition coating of Zn-Fe alloy plated steel sheets used for automobile bodies and parts.
（従来技術）
亜鉛めっき鋼板や亜鉛を主体とする合金（以下単に亜鉛
合金という）めっき鋼板は亜鉛の犠牲防食作用による耐
食性が優れていることから、従来上り自動車、家電およ
び建材などに幅広く使用されている。特に近年北米、カ
ナダ等の寒冷地域では冬期に道路凍結防止剤として散布
する岩塩や海岸地域における海塩粒子等の塩害により自
動Ｉｌｌ卓体の腐食が者しいことから、前記めっき鋼板
の自動車への使用要求が高まっている。(Prior art) Galvanized steel sheets and steel sheets coated with zinc-based alloys (hereinafter simply referred to as zinc alloys) have excellent corrosion resistance due to the sacrificial anticorrosive action of zinc, so they have been widely used in automobiles, home appliances, building materials, etc. ing. Particularly in recent years, in cold regions such as North America and Canada, corrosion of automatic Ill table bodies has been serious due to salt damage caused by rock salt sprayed as an antifreeze on roads in the winter and sea salt particles in coastal areas. Demand for use is increasing.
ところで自動車分野におけるプライマー塗装は一般に電
着塗装によっているが、亜鉛もしくは亜鉛合金めっき鋼
板に電着ブライマー塗装を施すと、塗膜表面に０．２〜
ＩＩＩ＋１程度のピンホール状の欠陥（以下がスピンと
いう）が冷延剥板の場合より多く発生し、中塗りや上塗
りを施しても表面欠陥として残り、美麗な外観を必要と
する外板への使用が困難であるという問題があった。By the way, primer coating in the automobile field is generally done by electrodeposition, but when electrodeposited primer is applied to a zinc or zinc alloy plated steel sheet, the paint film surface has a concentration of 0.2 to 0.
Pinhole-like defects of the order of III+1 (hereinafter referred to as spin) occur more frequently than in cold-rolled strips, and remain as surface defects even after applying an intermediate coat or top coat, making them difficult to apply to outer panels that require a beautiful appearance. There was a problem that it was difficult to use.
このがスピンは電着塗装の際の印加電圧が高い程著しく
発生する傾向があり、従来モの発生理由は次のように考
えられている。This spin tends to occur more significantly as the voltage applied during electrodeposition coating increases, and the reason for this spin is thought to be as follows.
まず第１の理由として考えられていることは、カチオン
電着塗装の時の初期に被塗物の表面に電流が局部的に集
中する部分が生じ、その部分で電流がスパークする。ス
パークが発生すると、その部分では発熱があるため、塗
膜は硬化し、電着を継続してもその硬化塗膜の上に塗料
は電着されず、ピンホール状になる。このピンホール状
のものはその後焼付けを行っても消えず、〃スピンとな
る。The first reason is thought to be that at the beginning of cationic electrodeposition coating, there are areas on the surface of the object to be coated where the current is locally concentrated, and the current sparks at those areas. When a spark occurs, heat is generated in that area, so the paint film hardens, and even if electrodeposition is continued, the paint will not be electrodeposited on the cured paint film, resulting in pinholes. This pinhole-like thing does not disappear even after baking, and becomes "spin."
次に第２の理由として考えられていることは、カチオン
電着塗装時に溶媒である水が電気分解されて、多量のＨ
２〃スが陰極である被塗物表面に発生し、これが塗膜中
に吸蔵される。吸蔵されたＨ２ｆｆ又は塗膜焼付は時に
塗膜硬化と同時に脱γスされるが、それが局部的に起る
ため、規〃スの起った部分がピンホール状になる。The second reason is thought to be that water, which is a solvent, is electrolyzed during cationic electrodeposition coating, resulting in a large amount of H.
2) Soot is generated on the surface of the object to be coated, which is the cathode, and is occluded in the coating film. The occluded H2ff or paint film baking is sometimes removed at the same time as the paint film hardens, but because this occurs locally, the area where the crack occurs becomes pinhole-shaped.
（発明が解決しようとする問題点）
本発明は亜鉛および亜鉛合金めっき鋼板のうち、特に電
着塗装後の耐食性の優れた後者のがスピン発生を冷延鋼
板の程度にまで減少させたカチオン電着塗装用防錆鋼板
およびその製造方法を提供するものである。(Problems to be Solved by the Invention) Among zinc and zinc alloy coated steel sheets, the latter, which has particularly excellent corrosion resistance after electrodeposition coating, is a cationic electroplating method that reduces spin generation to the level of cold-rolled steel sheets. The present invention provides a rust-proof steel plate for coating and a method for manufacturing the same.
（問題点を解決するための手段）
本発明者らは亜鉛合金めっき鋼板のカチオン電着塗装の
際のがスピン発生を防止すべく、種々研究した結果、表
面にＦｅ−ＰＳＦｅおよびＦｅＯからなる組成物を分散
析出させると、効果があることを見出した。(Means for Solving the Problems) The present inventors have conducted various studies to prevent spin generation during cationic electrodeposition coating of zinc alloy-plated steel sheets. We have discovered that dispersing and precipitating substances is effective.
ここで本発明がめつさ鋼板を亜鉛合金めっき鋼板にした
のは、亜鉛めっき鋼板は〃スピン発生の有無に関係なく
、カチオン電着塗装後耐食性が亜鉛合金めっき鋼板より
劣るからである。すなわち第１表は種々の方法で製造し
た亜鉛めっき鋼板と亜鉛合金めっき鋼板とにカチオン電
着塗装を施して、塩水噴霧試験および複合腐食試験とに
より耐食性を調査したものであるが、亜鉛めっき鋼板は
塗膜ふくれ幅が者しく大きく、カチオン塗装には適さな
い、一方Ｚｎ−Ｆｅ合金めっき鋼板の場合、合金相がり
相を主成分とするものは亜鉛めっき鋼板と同じ耐食性の
傾向を示すが、δ１相を主成分とするものは塗膜のふく
れ幅や鋼素地の腐食深さが小さく、耐食性が優れている
。またδ１相を主成分とするものにすれば、ふくれ幅が
冷延鋼板とほぼ同等になる。The reason why the present invention uses a zinc alloy-plated steel sheet as the galvanized steel sheet is because the corrosion resistance of a galvanized steel sheet after cationic electrodeposition coating is inferior to that of a zinc alloy-plated steel sheet, regardless of the presence or absence of spin generation. In other words, Table 1 shows the results of applying cationic electrodeposition coating to galvanized steel sheets and zinc alloy-coated steel sheets manufactured by various methods, and examining their corrosion resistance through salt spray tests and combined corrosion tests. Zn-Fe alloy plated steel sheets, on the other hand, have the same tendency of corrosion resistance as galvanized steel sheets, as the main component is an alloy phase. Those whose main component is the δ1 phase have a small bulge width of the coating film and a small corrosion depth of the steel substrate, and have excellent corrosion resistance. Furthermore, if the δ1 phase is used as the main component, the bulge width will be approximately the same as that of a cold-rolled steel sheet.
なおＺｎ−Ｆｅ合金めっき鋼板は合金相がδ１を主成分
とするものであれば、第１表より明らかなごとく、亜鉛
めっき鋼板に熱拡散処理を施してＺｎ −Ｆｅ合金にし
たものであっても、電気めっき法や蒸着めっき法により
最初からＺｎ−Ｆｅ合金めっきを施したものであっても
よい。As is clear from Table 1, the Zn-Fe alloy coated steel sheet is a Zn-Fe alloy obtained by subjecting the galvanized steel sheet to thermal diffusion treatment, as long as the alloy phase is mainly composed of δ1. Alternatively, Zn--Fe alloy plating may be applied from the beginning by electroplating or vapor deposition plating.
ｆｊＳ１表の試験条件
（１）カチオン電着塗装条件
面積が９０ ｃ＋ａ”（大ささ７５１１１１１１１Ｘ
１２０ ｍｓ）の試料を脱脂処理した後、リン酸塩処理
（日本ペイントｙグラ／ノンＳ Ｄ ２０００）を施し
、その後カチオン電着塗料（日本ペイント製パワートッ
プＵ−３０）を２８°Ｃ，２８０Ｖｔ’３分間通電する
ことにより２０μ鎗電着塗装し、１８０℃で２０分間焼
付は乾燥した。fjS1 table test conditions (1) Cationic electrodeposition coating conditions
After degreasing the sample (120 ms), phosphate treatment (Nippon Paint Y-GRA/Non SD 2000) was applied, and then cationic electrodeposition paint (Nippon Paint Power Top U-30) was applied at 28°C and 280Vt. A 20 μm electrodeposition coating was applied by applying electricity for 3 minutes, and then baked and dried at 180° C. for 20 minutes.
（２）７ｙスピン発生数
面積９０ｃ＠２当りに発生したがスピン数を目視により
数えた。(2) Number of 7y spins generated per area of 90c@2, and the number of spins was counted visually.
（３）塩水噴霧試験（ＳＳＴ）条件
電着塗装後の試料塗膜に鋼素地に達するクロスカットを
入れ、ＪＩＳ Ｚ ２３７１ｉ、：基づいて１ｏｏｏ時
間行い、塗膜のふくれ幅と鋼素地の腐ｔｔ深さを測定し
た。なお塗膜のふくれ幅はクロスカット部からの片側最
大印さを測定する方法により行い、鋼素地腐食深さは塗
膜とめっき層とを除去して、鋼素地の最大腐食深さを粗
度計で測定した。(3) Salt spray test (SST) conditions A cross cut is made in the sample coating film after electrodeposition to reach the steel substrate, and the test is conducted for 100 hours based on JIS Z 2371i, to determine the swelling width of the coating film and the corrosion of the steel substrate. The depth was measured. The bulging width of the coating film is determined by measuring the maximum mark on one side from the cross-cut part, and the corrosion depth of the steel substrate is determined by removing the coating film and plating layer, and measuring the maximum corrosion depth of the steel substrate by roughness. Measured with a meter.
（４）複合腐食試験（ＯＣＴ ）条件
上記条件の塩水噴ｎ試験４時間後６０°Ｃで２時間乾燥
し、その後温度５０℃、湿度９５％以上の湿潤試験を２
時間行うサイクルを１０００時間行い、塩水噴霧試験の
場合と同要領で塗膜のふくれ幅およびｗ４素地の腐食深
さを測定した。(4) Combined Corrosion Test (OCT) Conditions After 4 hours of salt water spray test under the above conditions, dry at 60°C for 2 hours, then perform 2 humid tests at a temperature of 50°C and a humidity of 95% or higher.
The cycle was repeated for 1000 hours, and the blistering width of the coating film and the corrosion depth of the W4 substrate were measured in the same manner as in the salt spray test.
鋼板表面に分散析出させるＦｅ−Ｐ、ＦｅおよびＦｅＯ
からなる組成物の量は０．５〜５９／＋ａ２にするのが
好ましい。これは析出量が０，５９／ｍ２未満であると
〃スピン発生を十分防止する効果がなく、５９／ｗ２を
越えるとＦｅが主成分のため、耐食性に悪影響を与え、
製造コストも高くなるからである。 ゛このＦｅ−Ｐ
、ＦｅおよびＦｅＯからなる組成物を鋼板表面に分散析
出させるには、鋼板をＦｅとＨ，ＰＯ２（次亜リン酸）
とを含有する水溶液で処理すれば、置換および／または
還元作用によって析出する。ここで水溶液としては、Ｆ
ｅ濃度が４〜３５ ９／ｅ、ＨｓＰＯ２ａ１度カ１０−
１００９７ｅｔｙ＞モノヲ使ｆＦｉ Ｌ、処理は浸漬や
スプレーなど従来の一般的な化成処理方法に上り液温２
０〜５（°Ｃで行えばよい。析出量は水溶液濃度、液温
、処理時間により調整する。Fe-P, Fe and FeO dispersed and precipitated on the steel plate surface
It is preferable that the amount of the composition is 0.5 to 59/+a2. This is because if the amount of precipitation is less than 0.59/m2, there is no sufficient effect to prevent spin generation, and if it exceeds 59/w2, since Fe is the main component, it will adversely affect corrosion resistance.
This is because manufacturing costs also increase.゛This Fe-P
In order to disperse and precipitate a composition consisting of Fe, Fe and FeO on the surface of a steel plate, the steel plate is treated with Fe, H, PO2 (hypophosphorous acid)
When treated with an aqueous solution containing , it precipitates by substitution and/or reduction action. Here, as an aqueous solution, F
e concentration is 4-35 9/e, HsPO2a 1 degree 10-
10097ety＞Monowo use fFi L, the treatment uses conventional general chemical conversion treatment methods such as dipping and spraying, and the liquid temperature is 2.
It may be carried out at 0 to 5°C. The amount of precipitation is adjusted by the concentration of the aqueous solution, the temperature of the solution, and the treatment time.
次に実施例により本発明を説明する。Next, the present invention will be explained with reference to examples.
（実施例）
ＦｅＣ１□１０−８０９／ｅ、１ＩｔＰＬ １Ｏ−１
００９７ｅ、ａ温２０−５０℃の水溶液にＺｎ−Ｆｅ合
金めっき鋼板（めっき付着量は製造方法に関係なくいず
れも３０９／１１２である）の試料（板厚０．８ｍｍ、
大きさ７５ＩＸ １２０ｍｍ）を１〜６０秒浸漬して、
鋼板表面にＦｅ−Ｐ、ＦｅおよびＦｅＯからなる組成物
を分散析出させた後、第１表の場合の試験条件と同条件
で脱脂処理、リン酸塩処理、カチオン電着塗装、焼付は
乾燥してＭＬ着塗装試料を作成し、試料内（９０ｃ＋ａ
２）に発生した〃スピン数を目視により数え、その後第
１表の場合と同要領で塩水噴霧試験（Ｓ Ｓ Ｔ ）と
複合腐食試験（ＯＣＴ ）を行い、塗膜のふくれ幅およ
び鋼素地の腐食深さを測定した。(Example) FeC1□10-809/e, 1ItPL 1O-1
0097e, a sample (plate thickness 0.8 mm,
(size 75IX 120mm) for 1 to 60 seconds,
After dispersing and precipitating a composition consisting of Fe-P, Fe and FeO on the surface of the steel sheet, degreasing, phosphate treatment, cationic electrodeposition coating, and drying were carried out under the same test conditions as in Table 1. Create a ML coated sample, and inside the sample (90c+a
2) The number of spins generated in step 2) was counted visually, and then a salt spray test (S S T ) and a combined corrosion test (OCT) were performed in the same manner as in Table 1 to determine the bulge width of the coating film and the steel substrate. The corrosion depth was measured.
一方比較材として、電気Ｚｎ−Ｎｉ合金めっ！＆鋼板（
めっき付着ｉ ３０９ ／＋ａ ”、Ｎ１含有率１０．
８ｗＬ％）と冷延鋼板とを上記水７８液で処理すること
なく、脱脂、リン酸塩処理して、上記同要領で電着塗装
、耐食性試験した。On the other hand, as a comparative material, electric Zn-Ni alloy plating! & steel plate (
Plating adhesion i 309 /+a'', N1 content 10.
8wL%) and a cold-rolled steel plate were degreased and treated with phosphate without being treated with the above-mentioned water 78 liquid, and subjected to electrodeposition coating and corrosion resistance test in the same manner as above.
第２表に〃スピン発生数と耐食性とを示す。Table 2 shows the number of spins and corrosion resistance.
第２表で本発明の鋼板と比較例１４の冷ｆＷ４板とを比
較してみれば明らかなように、本発明の鋼板のがスピン
発生数はいずれも２０個以内で、従来自動１１車体に使
用されている冷延鋼板の１８個とほぼ同等であり、実用
上問題がない。またふくれ幅はＳＳＴ、ＣＣＴとも３．
５ｍｍ以内と冷Ｘ鋼板の２．９ｍｍとほぼ同等であり、
良好である。さらに鋼素地の腐食深さはいずれも０．０
４ｍｍ以内で、冷延鋼板の０．５１＋＊ｗより著しく浅
い、またふくれ幅、鋼素地の腐食深さともＦｅ −Ｐ％
ＦｅおよびＦｅＯからなる組成物を分散析出させない第
１表に示したＺｎ−Ｆｅ合金めっき鋼板と同等で、分散
析出処理による耐食性劣化は認められない。As is clear from the comparison between the steel plate of the present invention and the cold fW4 plate of Comparative Example 14 in Table 2, the number of spins generated by the steel plate of the present invention was within 20 in all cases, compared to the conventional automobile body of 11. This is almost the same as the 18 pieces of cold-rolled steel sheet used, and there is no problem in practical use. Also, the bulge width is 3.0 for both SST and CCT.
Within 5mm, it is almost equivalent to 2.9mm of cold X steel plate,
In good condition. Furthermore, the corrosion depth of the steel base is 0.0 in both cases.
Within 4mm, it is significantly shallower than 0.51+*w of cold-rolled steel plate, and both the bulge width and the corrosion depth of the steel base are Fe-P%.
This is equivalent to the Zn-Fe alloy plated steel sheet shown in Table 1 in which the composition consisting of Fe and FeO is not dispersed and precipitated, and no deterioration in corrosion resistance is observed due to the dispersion precipitation treatment.
これに対してＦｅ−Ｐ、ＦｅおよびＦｅＯからなる組成
物の析出量が０．５９／ｍ２未満であると〃スピン発生
数が４２〜６０個と多くなって、〃スピン発生抑制効果
が小さく５９７鶴２をこえると塗膜の膨れ幅が大きくな
る傾向があり、いずれも好ましくない。On the other hand, if the amount of precipitation of the composition consisting of Fe-P, Fe and FeO is less than 0.59/m2, the number of spins will be as high as 42 to 60, and the effect of suppressing spin generation will be small. If it exceeds Tsuru 2, the blistering width of the coating film tends to increase, which is not preferable.
（発明の効果）
以上のごとく、本発明のカチオン電着塗装用防錆鋼板は
電着塗装の際のがスピン発生数が従来自動ｆＩｉ車体や
部材に一般に使用されている冷延鋼板とほぼ同等であり
、従来のＺｎ−Ｆｅ合金めっき鋼板より〃スピン発生が
減少する。また耐食性も従来のＺｎ−Ｆｅ合金めっき鋼
板と同等である。従って外貌上使用困難であった自動車
車体の外板に使用できる。(Effects of the Invention) As described above, the rust-preventing steel sheet for cationic electrodeposition coating of the present invention has almost the same number of spins during electrodeposition as the cold-rolled steel sheet commonly used for conventional FIi vehicle bodies and parts. Therefore, spin generation is reduced compared to conventional Zn-Fe alloy plated steel sheets. Moreover, the corrosion resistance is also equivalent to that of conventional Zn-Fe alloy plated steel sheets. Therefore, it can be used for the outer panels of automobile bodies, which were difficult to use due to their appearance.
Claims (4)
ｅおよびＦｅＯからなる組成物を分散析出させたことを
特徴とするカチオン電着塗装用防錆鋼板。(1) Fe-P, F on the surface of Zn-Fe alloy plated steel sheet
A rust-proofing steel sheet for cationic electrodeposition coating, characterized in that a composition consisting of e and FeO is dispersed and precipitated.
散析出量が０．５〜５ｇ／ｍ＾２であることを特徴とす
る特許請求の範囲第１項に記載のカチオン電着塗装用防
錆鋼板。(2) For cationic electrodeposition coating according to claim 1, wherein the amount of dispersed precipitation of the composition consisting of Fe-P, Fe and FeO is 0.5 to 5 g/m^2. Rust-proof steel plate.
するめっき層であることを特徴とする特許請求の範囲第
１項に記載のカチオン電着塗装用防錆鋼板。(3) The rust-preventing steel sheet for cationic electrodeposition coating according to claim 1, wherein the Zn-Fe alloy plated steel sheet has a plating layer containing δ_1 phase as a main component.
２とを含有する水溶液で処理して、表面にＦｅ−Ｐ、Ｆ
ｅおよびＦｅＯからなる組成物を分散析出させることを
特徴とするカチオン電着塗装用防錆鋼板の製造方法。(4) Zn-Fe alloy plated steel plate with Fe and H_3PO_
2 and treated with an aqueous solution containing Fe-P and F on the surface.
1. A method for producing a rust-proof steel sheet for cationic electrodeposition coating, which comprises dispersing and precipitating a composition consisting of FeO and FeO.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11123586A JPS62267497A (en) | 1986-05-15 | 1986-05-15 | Pustproof steel sheet for painting by cationic electrodeposition and its manufacture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11123586A JPS62267497A (en) | 1986-05-15 | 1986-05-15 | Pustproof steel sheet for painting by cationic electrodeposition and its manufacture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62267497A true JPS62267497A (en) | 1987-11-20 |
Family
ID=14555992
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11123586A Pending JPS62267497A (en) | 1986-05-15 | 1986-05-15 | Pustproof steel sheet for painting by cationic electrodeposition and its manufacture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62267497A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996010103A1 (en) * | 1994-09-27 | 1996-04-04 | Nkk Corporation | Galvanized steel sheet and process for producing the same |
-
1986
- 1986-05-15 JP JP11123586A patent/JPS62267497A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996010103A1 (en) * | 1994-09-27 | 1996-04-04 | Nkk Corporation | Galvanized steel sheet and process for producing the same |
| US5861218A (en) * | 1994-09-27 | 1999-01-19 | Nkk Cororation | Zinciferous plated steel sheet and method for manufacturing same |
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