JPH116078A - Chemical treating agent for aluminum and chemical treatment - Google Patents
Chemical treating agent for aluminum and chemical treatmentInfo
- Publication number
- JPH116078A JPH116078A JP15494097A JP15494097A JPH116078A JP H116078 A JPH116078 A JP H116078A JP 15494097 A JP15494097 A JP 15494097A JP 15494097 A JP15494097 A JP 15494097A JP H116078 A JPH116078 A JP H116078A
- Authority
- JP
- Japan
- Prior art keywords
- aluminum
- chemical conversion
- conversion treatment
- aluminum alloy
- 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
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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/34—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides
- C23C22/37—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides containing also hexavalent chromium compounds
Landscapes
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、アルミニウムまた
はアルミニウム合金（以下、アルミニウム合金と略記す
る）を塗装する前にそれらの表面に優れた耐食性と塗装
密着性を付与する新規なアルミニウム合金用化成処理液
に関する。特にアルミホイールの粉体塗装等の厚膜塗装
の際の前処理として効果的に適用されるものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel chemical conversion treatment for aluminum alloys which imparts excellent corrosion resistance and paint adhesion to the surface of aluminum or aluminum alloy (hereinafter abbreviated as aluminum alloy) before painting. Liquid. In particular, it is effectively applied as a pretreatment in thick film coating such as powder coating of aluminum wheels.
【０００２】[0002]
【従来の技術】アルミニウム合金のクロメート処理方法
としては、従来、リン酸クロメート、クロミウムクロメ
ート等があるが、アルミニウム合金表面特有の光沢を保
持したアルミホイール光輝仕様（着色が目視では分から
ないような表面仕上げ）の際、低クロム量（Ｃｒとして
５〜２０ｍｇ／ｍ2）でコントロールされるのが一般的
である。2. Description of the Related Art Conventionally, there are methods for chromate treatment of aluminum alloys such as chromate phosphate and chromium chromate. In the case of finishing, it is generally controlled with a low chromium amount (5 to 20 mg / m 2 as Cr).
【０００３】特公平７−１００８７２号公報にはりん酸
イオン、６価クロムイオン、およびフッ素イオン、フル
オロケイ酸イオンもしくはフルオロホウ酸イオンを含有
し、ｐＨを１.０〜３.０にしたアルミニウムまたはアル
ミニウム合金用化成処理液を開示している。この発明は
ジルコニウムイオンおよびＳｉイオンは使用されていな
い。また厚膜に塗装に対して優れた密着性を付与する提
案はされていない。特開平５−１７９４８６号公報はア
ルミホイールを、６価クロムイオン、硫酸イオン、フッ
素およびジルコニウムイオンを含む処理液中で陰極電解
処理することによりその表面にクロメート皮膜を形成す
ることを開示している。この発明はＳｉイオンを含まな
い。またこの発明は処理浴中で電解することを特徴とし
ており、糸錆の発生を防止するため、５０〜２５０ｍｇ
／ｍ2のクロム付着量の皮膜を形成することを意図して
いる。[0003] Japanese Patent Publication No. 7-100872 discloses aluminum or phosphate containing phosphate ion, hexavalent chromium ion, fluorine ion, fluorosilicate ion or fluoroborate ion and having a pH of 1.0 to 3.0. A chemical conversion treatment solution for an aluminum alloy is disclosed. This invention does not use zirconium ions or Si ions. Further, no proposal has been made to give a thick film excellent adhesion to coating. JP-A-5-179486 discloses forming a chromate film on the surface of an aluminum wheel by subjecting it to a cathodic electrolysis treatment in a treatment solution containing hexavalent chromium ions, sulfate ions, fluorine and zirconium ions. . The present invention does not include Si ions. Further, the present invention is characterized in that electrolysis is performed in a treatment bath, and 50 to 250 mg
/ M 2 is intended to form a film with a chromium coverage.
【０００４】上記引例に開示されたクロメートしょりは
一般的には溶剤塗装用前処理であるため、クロメート処
理後、塗装に先立って事前に水切り乾燥工程を必要とす
るが、この乾燥（８０〜１５０℃×１０〜３０分）によ
り、クロメート皮膜表面がより塗装密着性の悪い表面状
態（表面エネルギーの低下）に変化することが知られて
いる。この傾向は特に高膜厚塗装（粉体塗装を含む）の
前処理として採用したとき、塗膜密着性の低下と、それ
に基づく耐食性（サイクル腐食性）の低下をもたらす。[0004] The chromate bath disclosed in the above cited reference is generally a pretreatment for solvent coating. Therefore, after the chromate treatment, a drainage drying step is required in advance prior to coating. (150 ° C. for 10 to 30 minutes), it is known that the surface of the chromate film changes to a surface state with lower coating adhesion (reduction in surface energy). This tendency, particularly when employed as a pretreatment for high-thickness coating (including powder coating), results in a decrease in coating film adhesion and a reduction in corrosion resistance (cycle corrosion resistance) based on this.
【０００５】[0005]
【発明が解決しようとする課題】前記のような従来のク
ロメート処理方法で前処理されたアルミホイールは、そ
れに続く塗装のために水切り乾燥が必須であり、特に高
膜厚塗装（粉体塗装等）においては水切り乾燥による表
面状態の変質は解決されなければならない重要な課題で
ある。本発明の目的は、アルミニウムまたはアルミニウ
ム合金を化成処理液により前処理をした後、水切り乾燥
を行っても、高膜厚塗装（粉体塗装等）塗膜の密着性が
良好に保たれ、塗膜に優れた密着性と耐食性を付与する
化成処理液を提供するするものである。The aluminum wheels pretreated by the conventional chromate treatment method as described above require draining and drying for subsequent coating, especially for high-thickness coating (powder coating, etc.). In (2), deterioration of the surface state due to draining and drying is an important problem that must be solved. An object of the present invention is to maintain good adhesion of a high-thickness coating (such as powder coating) even after pre-treatment of aluminum or an aluminum alloy with a chemical conversion treatment solution and then draining and drying. It is an object of the present invention to provide a chemical conversion treatment liquid that imparts excellent adhesion and corrosion resistance to a film.
【０００６】[0006]
【課題を解決するための手段】本発明は、６価クロムイ
オン０.１〜０.５ｇ／ｌ、フルオロジルコニウムイオン
をＺｒとして０.０１〜０.５ｇ／ｌ、フッ素イオンをＦ
として０.１〜０.５ｇ／ｌ、更に水溶性珪素化合物をＳ
ｉとして０.０１〜０.１ｇ／ｌ含むｐＨ１.５〜３.０の
アルミニウムおよびアルミニウム合金、特にアルミホイ
ール用クロメート処理液を提供する。また本発明は、ア
ルミニウムまたはアルミニウム合金の塗装前処理として
アルミニウムまたはアルミニウム合金を上記の化成処理
液で処理し、その表面にクロム量として５〜２０ｍｇ／
ｍ2のクロム皮膜を形成することを特徴とするアルミニ
ウムまたはアルミニウム合金の化成処理方法を提供す
る。また本発明は、アルミニウムまたはアルミニウム合
金、特にアルミホイールの塗装前処理としてアルミニウ
ムまたはアルミニウム合金を酸またはアルカリによりエ
ッチングしたのち、上記の化成処理を行うアルミニウム
またはアルミニウム合金の化成処理方法を提供する。更
に本発明は、上記方法により化成処理されたアルミホイ
ールに関する。The present invention provides a hexavalent chromium ion of 0.1 to 0.5 g / l, a fluorozirconium ion of Zr of 0.01 to 0.5 g / l, and a fluorine ion of F
0.1 to 0.5 g / l and a water-soluble silicon compound as S
Provided is a chromate treatment solution for aluminum and aluminum alloys, particularly for aluminum wheels, having a pH of 1.5 to 3.0 and containing i as 0.01 to 0.1 g / l. Also, the present invention provides an aluminum or aluminum alloy as a pretreatment for coating aluminum or an aluminum alloy with the above-mentioned chemical conversion treatment solution, and has a chromium content of 5 to 20 mg /
Provided is a chemical conversion treatment method for aluminum or an aluminum alloy, which comprises forming a m 2 chromium film. The present invention also provides a chemical conversion treatment method for aluminum or an aluminum alloy, in which the aluminum or aluminum alloy is etched with an acid or an alkali as a pretreatment for coating aluminum or an aluminum alloy, particularly an aluminum wheel, and then subjected to the above chemical conversion treatment. Further, the present invention relates to an aluminum wheel subjected to a chemical conversion treatment by the above method.
【０００７】[0007]
【発明の実施の形態】本発明の化成処理液は６価クロム
イオン、フルオロジルコニウムイオン、フッ素イオンお
よびＳｉイオンを必須成分として含むことを特徴とす
る。６価クロムイオンを含有させるにはクロム酸（Ｃｒ
Ｏ3）を使用することが好ましい。このクロム酸の含有
量は６価クロムイオンとして０.１〜０.５ｇ／ｌ、特に
０.２５〜０.３５ｇ／ｌの範囲が好ましく、０.１以下
では化成皮膜が十分に形成されない（クロム付着量とし
て５ｍｇ／ｍ2以下）ため耐食性が劣る。０.５ｇ／ｌを
越えると、皮膜付着量が過大となり（クロム付着量とし
て２０ｍｇ／ｍ2以上）、アルミホイール光輝仕様時等
に外観不良（目視で着色が判断される状態）となる。BEST MODE FOR CARRYING OUT THE INVENTION The chemical conversion treatment solution of the present invention is characterized by containing hexavalent chromium ion, fluorozirconium ion, fluorine ion and Si ion as essential components. To contain hexavalent chromium ions, chromic acid (Cr
O 3 ) is preferably used. The content of the chromic acid is preferably 0.1 to 0.5 g / l, particularly 0.25 to 0.35 g / l, as hexavalent chromium ion. When the content is less than 0.1, a chemical conversion film is not sufficiently formed ( Since the amount of chromium adhered is 5 mg / m 2 or less), the corrosion resistance is poor. If it exceeds 0.5 g / l, the coating amount becomes excessive (the coating amount of chromium is 20 mg / m 2 or more), resulting in poor appearance (a state in which coloring is judged visually) when using aluminum wheel glittering specifications.
【０００８】フルオロジルコニウムイオンは供給源とし
てジルコンフッ化水素酸またはその塩類等を用いること
ができる。フルオロジルコニウムイオンはＺｒとして
０.０１〜０.５ｇ／ｌの範囲が好ましく、特に０.０５
〜０.１５ｇ／ｌの範囲で含まれるのが好ましい。フッ
素イオンはフルオロジルコニウム錯塩、珪フッ化物、珪
フッ化水素酸、フッ化水素酸（ＨＦ）、フッ化ナトリウ
ム（ＮａＦ）、フッ化カリウム（ＫＦ）等の１種または
２種以上より選択され、供給される。全フッ素量として
０.１〜０.５ｇ／ｌ、特に０.１５〜０.２５ｇ／ｌの範
囲が好ましく、０.１ｇ／ｌ以下では化成皮膜量の低下
（クロム付着量として５ｍｇ／ｍ2以下）により耐食性
が低下し、０.５ｇ／ｌ以下では皮膜付着量が過大とな
り外観不良となる。As the source of the fluorozirconium ion, zircon hydrofluoric acid or salts thereof can be used. The fluorozirconium ion preferably has a Zr in the range of 0.01 to 0.5 g / l, particularly 0.05.
It is preferably contained in the range of 0.15 g / l. The fluorine ion is selected from one or more of fluorozirconium complex salt, silicofluoride, hydrosilicofluoric acid, hydrofluoric acid (HF), sodium fluoride (NaF), potassium fluoride (KF), and the like, Supplied. The total fluorine content is preferably in the range of 0.1 to 0.5 g / l, particularly 0.15 to 0.25 g / l, and when the total fluorine content is 0.1 g / l or less, the amount of the chemical conversion film decreases (5 mg / m 2 in chromium adhesion amount). Below), the corrosion resistance is reduced, and if it is less than 0.5 g / l, the amount of coating applied becomes excessive and the appearance becomes poor.
【０００９】Ｓｉイオンは水溶性もしくはコロイド珪素
化合物として供給される。水溶性もしくはコロイド珪素
化合物としは、コロイダルシリカ、珪酸アルカリおよび
フルオロ珪酸イオンから選択される１種または２種以上
が用いられる。Ｓｉイオンの配合量はＳｉとして０.０
１〜０.１ｇ／ｌの範囲に調整されることが好ましく、
特に０.０２〜０.０５ｇ／ｌの範囲が好ましい。０.０
１以下では高膜厚塗膜（粉体塗装塗膜等）の密着性に優
れた表面を付与できず、０.１ｇ／ｌ以上では耐食性が
低下する。The Si ions are supplied as a water-soluble or colloidal silicon compound. As the water-soluble or colloidal silicon compound, one or more selected from colloidal silica, alkali silicate and fluorosilicate ions are used. The compounding amount of Si ions is 0.0 as Si.
It is preferably adjusted to a range of 1 to 0.1 g / l,
In particular, the range is preferably 0.02 to 0.05 g / l. 0.0
If it is less than 1, a surface having excellent adhesion of a high-thickness coating film (such as a powder coating film) cannot be imparted, and if it is 0.1 g / l or more, the corrosion resistance decreases.
【００１０】化成処理液のｐＨは１.５〜３.０、好まし
くは２.０〜２.５の範囲に制御されるが、ｐＨの調整に
はリン酸、硝酸、塩酸などの酸または水酸化ナトリウ
ム、水酸化カリウムなどから任意に選んで用いることが
できる。ｐＨが１.５未満ではエッチング過多となり、
皮膜が形成されにくく、３.０を越えるとエッチングが
が弱くなり均一且つ十分な皮膜が形成されない。The pH of the chemical conversion treatment solution is controlled in the range of 1.5 to 3.0, preferably 2.0 to 2.5, and the pH is adjusted by using an acid such as phosphoric acid, nitric acid, hydrochloric acid or water. It can be arbitrarily selected from sodium oxide, potassium hydroxide and the like. If the pH is less than 1.5, the etching becomes excessive,
If the film is hardly formed, if it exceeds 3.0, the etching becomes weak and a uniform and sufficient film cannot be formed.
【００１１】アルミニウムまたはアルミニウム合金上に
本発明の化成処理を施す場合には、まず表面を清浄化す
る。その洗浄方法としては純水での洗浄、アルカリ洗
浄、酸洗浄または溶剤の洗浄の１ないし２以上を組み合
せて洗浄してもよい。またアルミニウムまたはアルミニ
ウム合金表面を洗浄したのち、酸またはアルカリ等でエ
ッチングしてもよい。When performing the chemical conversion treatment of the present invention on aluminum or an aluminum alloy, the surface is first cleaned. As the washing method, one or more of washing with pure water, alkali washing, acid washing or solvent washing may be combined for washing. After cleaning the aluminum or aluminum alloy surface, etching may be performed with an acid or an alkali.
【００１２】本発明の化成処理液による処理方法として
は、浸漬、スプレーなど任意の方法を使用してもよい。
処理温度と処理時間は被処理物のクロム付着量を左右す
る因子となる。処理は１０〜７０℃の間で行うことがで
きるが、好ましくは３０〜５０℃の範囲である。また処
理時間は１０〜３００秒が好ましいが、５〜２０ｇ／ｍ
2のクロム付着量を得るためには３０〜９０秒が好まし
い。As the treatment method using the chemical conversion treatment solution of the present invention, any method such as immersion or spraying may be used.
The processing temperature and the processing time are factors that influence the amount of chromium adhering to the object. The treatment can be carried out at a temperature between 10 and 70 ° C, preferably in a range between 30 and 50 ° C. The processing time is preferably from 10 to 300 seconds, but from 5 to 20 g / m
In order to obtain the chromium deposition amount of 2 , 30 to 90 seconds are preferable.
【００１３】[0013]
【実施例】以下に、実施例により本発明をより具体的に
詳細に説明する。実施例 １、２ 表面が鋳造研削されたアルミホイール（材質：ＡＣ４
Ｇ）を５０〜５５℃に加熱保持した脱脂剤〔日本ペイン
ト（株）製；商品名「サーフクリーナー５３Ｓ」を水で
２％（ｗ／ｖ）に希釈して使用〕でスプレー圧１ｋｇ／
ｃｍ2で２分間スプレー処理して表面の油分を取り除い
た。脱脂後、水道水で脱脂剤を十分洗浄除去し、酸洗を
行った。酸洗浴は、硫酸を２％（ｗ／ｖ）、エッチング
コントロール剤〔日本ペイント（株）製；商品名「サー
フダイザー＃１」〕を１％（ｗ／ｖ）となるように水中
に溶解したものを用いた。酸洗浴は５０℃に保温し、こ
こに１分間浸漬した。酸洗処理後水道水で洗浄した後、
アルミホイール表面に３５℃に加熱した本発明の化成処
理液を小型スプレーテンターを用いて１ｋｇ／ｃｍ２で
６０秒間スプレー塗布した。使用した化成処理液の配合
および配合量および液中の有効成分の含有量および液の
ｐＨを表１に示した。上記化成処理液を塗布したアルミ
ホイールはその表面にクロメート皮膜を形成した。次に
アルミホイールは水道水による洗浄、次いで電気伝導度
が５μｓ／ｃｍ以下のイオン交換水により純水洗浄によ
り十分清浄化した。これを電気乾燥機中で８０℃で１０
分間乾燥した。化成処理液による前処理を施したアルミ
ホイールに粉体塗料「パウダックスＡ５０」（日本ペイ
ント（株）製）を塗布し、１６０℃で２０分間焼付け乾
燥して膜厚１２０〜１３０μｍの塗膜を形成した。得ら
れた塗装アルミホイールの塗膜につき、化成処理による
クロム付着量および粉体塗装皮膜の特性を表２に記載し
た。The present invention will be described below in more detail with reference to examples. Example 1 Aluminum wheels whose surfaces were cast and ground (material: AC4
G) heated at 50 to 55 ° C. and heated with a degreasing agent [manufactured by Nippon Paint Co., Ltd .; trade name “Surf Cleaner 53S” diluted to 2% (w / v) with water] and spray pressure of 1 kg /
The oil was removed from the surface by spraying at 2 cm 2 for 2 minutes. After degreasing, the degreasing agent was sufficiently washed and removed with tap water, and pickling was performed. In the pickling bath, 2% (w / v) sulfuric acid and 1% (w / v) of an etching control agent (manufactured by Nippon Paint Co., Ltd .; trade name "Surf Dither # 1") were dissolved in water. Was used. The pickling bath was kept at 50 ° C. and immersed therein for 1 minute. After washing with tap water after pickling,
The chemical conversion treatment solution of the present invention heated to 35 ° C. was spray-coated on the aluminum wheel surface at 1 kg / cm 2 for 60 seconds using a small spray tenter. Table 1 shows the composition and amount of the chemical conversion treatment solution used, the content of the active ingredient in the solution, and the pH of the solution. The aluminum wheel coated with the above-mentioned chemical conversion treatment solution formed a chromate film on its surface. Next, the aluminum wheel was sufficiently cleaned by washing with tap water, and then with deionized water having ion conductivity of 5 μs / cm or less. This is placed in an electric dryer at 80 ° C for 10
Dried for minutes. A powder coating “Powax A50” (manufactured by Nippon Paint Co., Ltd.) is applied to an aluminum wheel that has been pre-treated with a chemical conversion treatment solution, baked at 160 ° C. for 20 minutes, and dried to form a coating film having a thickness of 120 to 130 μm. Formed. Table 2 shows the amount of chromium deposited by the chemical conversion treatment and the characteristics of the powder coating film on the coating film of the obtained coated aluminum wheel.
【００１４】比較例 １〜３ 化成処理液として表１に示すものを使用した以外は実施
例１と同様にして、アルミホイールの前処理および粉体
塗装を行った。得られた塗装アルミホイールの塗膜につ
き、化成処理によるクロム付着量および粉体塗装皮膜の
特性を表２に記載した。 Comparative Examples 1-3 Pretreatment of aluminum wheels and powder coating were carried out in the same manner as in Example 1 except that the chemical conversion treatment solutions shown in Table 1 were used. Table 2 shows the amount of chromium deposited by the chemical conversion treatment and the characteristics of the powder coating film on the coating film of the obtained coated aluminum wheel.
【００１５】[0015]
【表１】 [Table 1]
【００１６】[0016]
【表２】 [Table 2]
【００１７】粉体塗装塗膜の特性および化成処理液によ
るクロムの付着量を次の方法により評価した。 〔塗膜の２次密着性〕粉体塗装したアルミホイールを５
０℃の温水中に２４０時間浸漬したのち、ナイフでゴバ
ン目状に２ｍｍ間隔に切り目をいれて、セロテープによ
り剥がれを評価した。評価基準 ◎：端部剥離なし、 ○：剥離面積が１０％未満 △：剥離面積が３０％未満 ×：剥離面積が３０％以上The properties of the powder coating film and the amount of chromium deposited by the chemical conversion solution were evaluated by the following methods. [Secondary adhesion of coating film] 5 aluminum wheels coated with powder
After being immersed in hot water of 0 ° C. for 240 hours, cuts were made at intervals of 2 mm with a knife in a gobo shape, and peeling was evaluated with a cellophane tape. Evaluation criteria ◎: No peeling at the end, ○: Peeling area is less than 10% △: Peeling area is less than 30% ×: Peeling area is 30% or more
【００１８】〔耐食性〕クロスカット（十文字に切り目
を入れる）を入れた後、サイクル腐食試験（ＣＣＴ）を
１００サイクル行い、１００サイクル後、取り出して外
観を目視評価した。なお、ＣＣＴの１サイクルには、次
の環境条件が加えられる： 塩水噴霧試験（ＳＳＴ；５％ＮａＣｌ×３５℃）２時間 → 高温高湿条件（９ ８％ＲＨ×４０℃）２時間 → 乾燥条件（６０℃）４時間。 〔クロム付着量〕蛍光Ｘ線を用いて定量分析を行った。[Corrosion Resistance] After a cross cut (cut in a cross) was made, a cycle corrosion test (CCT) was performed for 100 cycles, and after 100 cycles, the sample was taken out and visually evaluated for appearance. The following environmental conditions are added to one cycle of CCT: salt spray test (SST; 5% NaCl × 35 ° C.) for 2 hours → high temperature and high humidity conditions (98% RH × 40 ° C.) for 2 hours → drying Condition (60 ° C.) 4 hours. [Chromium attached amount] Quantitative analysis was performed using fluorescent X-rays.
【００１９】[0019]
【発明の効果】アルミニウムまたはアルミニウム合金の
塗装に先立って、本発明の化成処理液によりその表面を
前処理しておくことによって、粉体塗装のような厚膜塗
装を行った場合でも、２次密着性は優れており、その結
果耐食性にも優れた塗装仕上げが得られる。According to the present invention, the surface is pretreated with the chemical conversion treatment solution of the present invention prior to the coating of aluminum or aluminum alloy, so that even when a thick film coating such as a powder coating is performed, the secondary coating is performed. Excellent adhesion, resulting in a paint finish with excellent corrosion resistance.
Claims (6)
フルオロジルコニウムイオンをＺｒとして０.０１〜０.
５ｇ／ｌ、更に水溶性もしくはコロイド珪素化合物をＳ
ｉとして０.０１〜０.１ｇ／ｌ含み、フッ素を全体とし
て０.１〜０.５ｇ／ｌ含有するｐＨ１.５〜３.０のアル
ミニウムおよびアルミニウム合金用化成処理液。1. A hexavalent chromium ion of 0.1 to 0.5 g / l,
The fluorozirconium ion is 0.01 to 0.1 as Zr.
5 g / l, water-soluble or colloidal silicon compound
A chemical conversion treatment solution for aluminum and aluminum alloy having a pH of 1.5 to 3.0, containing 0.01 to 0.1 g / l as i and containing 0.1 to 0.5 g / l of fluorine as a whole.
酸アルカリ、フルオロ珪酸イオン、コロイダルシリカか
らなる群から選ばれる１種または２種以上の化合物であ
る請求項１記載の化成処理液。2. The chemical conversion treatment solution according to claim 1, wherein the water-soluble or colloidal silicon compound is one or more compounds selected from the group consisting of alkali silicate, fluorosilicate ion, and colloidal silica.
塗装前処理としてアルミニウムまたはアルミニウム合金
を請求項１または２に記載の化成処理液で処理し、その
表面にクロム量として５〜２０ｍｇ／ｍ2のクロム皮膜
を形成することを特徴とするアルミニウムまたはアルミ
ニウム合金の化成処理方法。3. An aluminum or aluminum alloy is treated with the chemical conversion treatment solution according to claim 1 or 2 as a pretreatment for coating the aluminum or the aluminum alloy, and a chromium film having a chromium content of 5 to 20 mg / m 2 is formed on the surface thereof. A method for chemical conversion treatment of aluminum or an aluminum alloy, characterized by forming.
塗装前処理としてアルミニウムまたはアルミニウム合金
を酸またはアルカリによりエッチングしたのち、請求項
３に記載の化成処理を行うアルミニウムまたはアルミニ
ウム合金の化成処理方法。4. A chemical conversion treatment method for aluminum or an aluminum alloy according to claim 3, wherein the aluminum or aluminum alloy is subjected to a chemical conversion treatment after the aluminum or aluminum alloy is etched with an acid or an alkali as a pretreatment for coating the aluminum or aluminum alloy.
塗装が粉体塗装である請求項３または４記載の化成処理
方法。5. The chemical conversion treatment method according to claim 3, wherein the coating of aluminum or aluminum alloy is powder coating.
理されたアルミホイール。6. An aluminum wheel subjected to a chemical conversion treatment according to any one of claims 3 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15494097A JPH116078A (en) | 1997-06-12 | 1997-06-12 | Chemical treating agent for aluminum and chemical treatment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15494097A JPH116078A (en) | 1997-06-12 | 1997-06-12 | Chemical treating agent for aluminum and chemical treatment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH116078A true JPH116078A (en) | 1999-01-12 |
Family
ID=15595266
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15494097A Pending JPH116078A (en) | 1997-06-12 | 1997-06-12 | Chemical treating agent for aluminum and chemical treatment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH116078A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000282251A (en) * | 1999-01-25 | 2000-10-10 | Topy Ind Ltd | Coating method for aluminum base material and aluminum alloy base material, and coated article |
| EP1106710A2 (en) * | 1999-12-09 | 2001-06-13 | Nippon Paint Co., Ltd. | Aluminium wheel surface conditioner, method of coating therewith, and unpigmented aluminium wheel |
| EP1120479A2 (en) * | 2000-01-28 | 2001-08-01 | Nippon Paint Co., Ltd. | Method of coating aluminum wheels and clear coated aluminium wheels |
| JP2007107069A (en) * | 2005-10-17 | 2007-04-26 | Chuo Motor Wheel Co Ltd | Surface treatment method for aluminum-based substrate |
| JP2007196227A (en) * | 1999-01-25 | 2007-08-09 | Topy Ind Ltd | Coating method for aluminum base material and aluminum alloy base material, and coated article |
| JP2010156055A (en) * | 1997-09-17 | 2010-07-15 | Chemetall Plc | Method and composition for preventing corrosion of metal substrate |
-
1997
- 1997-06-12 JP JP15494097A patent/JPH116078A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010156055A (en) * | 1997-09-17 | 2010-07-15 | Chemetall Plc | Method and composition for preventing corrosion of metal substrate |
| JP2000282251A (en) * | 1999-01-25 | 2000-10-10 | Topy Ind Ltd | Coating method for aluminum base material and aluminum alloy base material, and coated article |
| JP2007196227A (en) * | 1999-01-25 | 2007-08-09 | Topy Ind Ltd | Coating method for aluminum base material and aluminum alloy base material, and coated article |
| EP1106710A2 (en) * | 1999-12-09 | 2001-06-13 | Nippon Paint Co., Ltd. | Aluminium wheel surface conditioner, method of coating therewith, and unpigmented aluminium wheel |
| EP1106710A3 (en) * | 1999-12-09 | 2003-07-09 | Nippon Paint Co., Ltd. | Aluminium wheel surface conditioner, method of coating therewith, and unpigmented aluminium wheel |
| EP1120479A2 (en) * | 2000-01-28 | 2001-08-01 | Nippon Paint Co., Ltd. | Method of coating aluminum wheels and clear coated aluminium wheels |
| EP1120479A3 (en) * | 2000-01-28 | 2003-07-09 | Nippon Paint Co., Ltd. | Method of coating aluminum wheels and clear coated aluminium wheels |
| JP2007107069A (en) * | 2005-10-17 | 2007-04-26 | Chuo Motor Wheel Co Ltd | Surface treatment method for aluminum-based substrate |
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