JP2999061B2 - Surface treatment method for polyethylene powder lining - Google Patents
Surface treatment method for polyethylene powder liningInfo
- Publication number
- JP2999061B2 JP2999061B2 JP10764192A JP10764192A JP2999061B2 JP 2999061 B2 JP2999061 B2 JP 2999061B2 JP 10764192 A JP10764192 A JP 10764192A JP 10764192 A JP10764192 A JP 10764192A JP 2999061 B2 JP2999061 B2 JP 2999061B2
- Authority
- JP
- Japan
- Prior art keywords
- lining
- polyethylene powder
- water
- washed
- polyethylene
- 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
Links
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- Application Of Or Painting With Fluid Materials (AREA)
- Chemical Treatment Of Metals (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は炭素鋼からなる各種装置
の配管、機器に用いられるポリエチレンライニングの下
地処理方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating a surface of a polyethylene lining used for piping and equipment of various devices made of carbon steel.
【０００２】[0002]
【従来の技術】従来、ポリエチレン粉体ライニングは炭
素鋼からなる被ライニング材表面を脱脂洗浄し、ブラス
ト処理または酸洗浄してからリン酸塩による化成処理被
膜を形成させたのち、２００〜３００℃に該被ライニン
グ材を予備加熱して、ポリエチレンの粉体を供給して被
ライニング材の保有熱または被ライニング面の逆側から
の供給熱によりポリエチレンの粉体を熱溶融して連続し
たポリエチレンライニング被膜を形成する方法が行われ
ている。2. Description of the Related Art Conventionally, a polyethylene powder lining is prepared by subjecting the surface of a lining material made of carbon steel to degreasing and washing, blasting or acid washing, and then forming a chemical conversion treatment coating with phosphate, followed by 200 to 300 ° C. The lining material is preheated to supply polyethylene powder, and the polyethylene powder is heated and melted by the retained heat of the lining material or the heat supplied from the opposite side of the lining surface to continuously polyethylene lining A method of forming a coating has been performed.
【０００３】[0003]
【発明が解決しようとする課題】これまで、ポリエチレ
ン粉体ライニングは水道用配管あるいは海水取水管など
比較的温度の低い（３０℃以下）液と接する環境に多用
され、耐久性の面でもそれなりの実績を有している。と
ころが従来の方法で施工したポリエチレン粉体ライニン
グ材を化学プラント、発電プラントなど液温が５０〜６
０℃の環境に用いた場合、ポリエチレンの被膜が短時間
で剥離したり、ブリスタを生じる事故が多発している。
剥離及びブリスタ部の被ライニング面を調査すると、必
ず被ライニング面の腐食が認められることから、従来の
ポリエチレンライニング材は液温が高く、かつ、水蒸気
及び酸素の透過が加速される温度勾配環境に用いた場
合、下地面が腐食されやすいことが分かる。Hitherto, polyethylene powder lining has been frequently used in an environment where it is in contact with a liquid having a relatively low temperature (30 ° C. or less) such as a water supply pipe or a seawater intake pipe, and has a reasonable durability. Has a track record. However, when the polyethylene powder lining material constructed by the conventional method is used in a chemical plant, a power plant, or the like, the liquid temperature is 50-6.
When used in an environment of 0 ° C., there are many accidents in which a polyethylene coating peels off in a short time or blisters occur.
When inspecting the lining surface of the peeling and blister parts, corrosion of the lining surface is always observed.Therefore, the conventional polyethylene lining material has a high liquid temperature and is exposed to a temperature gradient environment where the permeation of water vapor and oxygen is accelerated. It can be seen that when used, the underlying surface is easily corroded.
【０００４】従来のポリエチレン粉体ライニング法にお
けるブラスト処理またはリン酸塩による化成処理などの
下地処理は塗装及び樹脂またはゴムライニングなどの下
地処理として産業界で広範囲に適用されている方法であ
るが、２００〜３００℃で被ライニング材を加熱し、ポ
リエチレン粉末を熱溶融させるポリエチレン粉体ライニ
ング法における下地処理方法としては次のような理由で
必ずしも適正とは言い難い。Undercoating treatments such as blast treatment or chemical conversion treatment with phosphate in the conventional polyethylene powder lining method are widely applied in the industry as undercoating treatments such as coating and resin or rubber lining. It is not always appropriate for the ground treatment method in the polyethylene powder lining method in which the lining material is heated at 200 to 300 ° C. and the polyethylene powder is thermally melted for the following reasons.
【０００５】先ず、ブラスト処理は被ライニング面の錆
または異物などを除去することと、ブラストにより生じ
た表面の凹凸のアンカ効果によって、塗膜またはライニ
ングの付着力を向上するとともに、前記錆または異物付
着に起因する局部電池形成による腐食を抑制する狙いが
ある。しかし、ブラスト処理面は活性金属面が露出して
おり、腐食環境に暴露された場合、全面腐食が進行し、
腐食を抑制する効果は期待できない。[0005] First, the blasting treatment removes rust or foreign matter on the surface to be lined and improves the adhesion of the coating film or lining by the anchor effect of the unevenness of the surface caused by the blasting. The aim is to suppress corrosion due to local cell formation due to adhesion. However, the active metal surface is exposed on the blasted surface, and when exposed to a corrosive environment, overall corrosion progresses,
The effect of suppressing corrosion cannot be expected.
【０００６】そこで一般の塗装、樹脂ライニング、ゴム
ライニングなどではＺｎ，Ｓｎ，Ａｌなどの粉体を配合
したプライマーを塗布し、ブラスト面の腐食を防止する
方法が採用されている。ところが、ポリエチレン粉体ラ
イニングの場合、２００〜３００℃に加熱するため、前
記防食効果を期待したプライマーは樹脂の熱分解及び前
記Ｚｎ，Ｓｎ，Ａｌが酸化されて、ＺｎＯ2 ，Ｓｎ
Ｏ2 ，Ａｌ2 Ｏ3 などに変化し、電気化学的な防食作用
も消失するため使用できず、ライニング用のポリエチレ
ン粉体を直接供給してライニングしている。また、被ラ
イニング材の予備加熱工程及びポリエチレン粉体の溶融
は空気中で行われており、この間に被ライニング材のブ
ラスト面は局部的に酸化され、腐食環境に暴露された場
合、局部電池形成による腐食されやすいＦｅ2 Ｏ3 系の
酸化膜が部分的に形成されやすい。Therefore, in general coating, resin lining, rubber lining and the like, a method is adopted in which a primer containing a powder of Zn, Sn, Al or the like is applied to prevent corrosion of the blast surface. However, in the case of polyethylene powder lining, since the primer is heated to 200 to 300 ° C., the primer expected to have the anticorrosion effect is thermally decomposed of the resin and the Zn, Sn, and Al are oxidized, and ZnO 2 , Sn
It changes to O 2 , Al 2 O 3, etc. and cannot be used because the electrochemical anticorrosion action is also lost, and lining is directly supplied by supplying polyethylene powder for lining. In addition, the pre-heating step of the lining material and the melting of the polyethylene powder are performed in the air. During this time, the blast surface of the lining material is locally oxidized, and when exposed to a corrosive environment, a local battery is formed. An Fe 2 O 3 -based oxide film, which is easily corroded by the above, is likely to be partially formed.
【０００７】一方、リン酸塩による化成処理被膜を形成
させる下地処理は腐食性物質の拡散抑制及びその被膜中
に含まれる金属塩による電気化学的防錆効果を狙いとし
て一般的に塗装下地処理として適用されている方法であ
る。しかしながら、リン酸塩による化成処理被膜はＭｎ
3 （ＰＯ4 ）2 ・２ＭｎＨＰＯ4 ・４Ｈ2 ＯとＦｅＨＰ
Ｏ4 ・４Ｈ2 Ｏの混合結晶あるいはＺｎ3 （ＰＯ4 ）2
・４Ｈ2 ＯとＦｅＨＰＯ4 ・２〜４Ｈ2 Ｏの混合結晶あ
るいはγ・Ｆｅ2 Ｏ3 ・ＦｅＰＯ4 ・２Ｈ2 ＯまたはＦ
ｅＨＰＯ4 ・４〜８Ｈ2 Ｏなどからなっている。これら
の結晶は１００〜２４０℃で結晶水を放出するととも
に、リン酸マンガン系被膜では２５０℃付近、リン酸亜
鉛系では１３０℃から酸化分解が始まる。従って、２０
０〜３００℃で加熱溶融させるポリエチレン粉体ライニ
ングにおいては脱水によるポーラス化、脱水時のリン酸
被膜のクラック発生及び化成処理被膜の付着力の低下ば
かりでなく、リン酸被膜中のＭｎ，Ｚｎなどの酸化によ
る防食効果の低下、更にはこれらの塩の酸化が進行して
いる場合には腐食電位の逆転による腐食の加速などにつ
ながり、一般的に適用されている塗装下地処理と同等の
防錆効果は期待できず、ポーラス化、クラック発生によ
る付着力の低下で、剥離やブリスタが短時間に発生しや
すくなる。On the other hand, a base treatment for forming a chemical conversion coating with phosphate is generally used as a coating base treatment for the purpose of suppressing the diffusion of corrosive substances and the electrochemical rust-preventing effect of metal salts contained in the coating. This is the method applied. However, the chemical conversion coating with phosphate is Mn.
3 (PO 4) 2 · 2MnHPO 4 · 4H 2 O and FeHP
O 4 · 4H 2 O mixed crystal or Zn 3 (PO 4 ) 2
· 4H 2 O and FeHPO 4 · 2~4H 2 O mixed crystal or gamma · Fe 2 of O 3 · FePO 4 · 2H 2 O or F
eHPO 4 · 4~8H 2 O is made from such. These crystals release water of crystallization at 100 to 240 ° C., and oxidative decomposition starts at about 250 ° C. for a manganese phosphate coating and at 130 ° C. for a zinc phosphate coating. Therefore, 20
In the polyethylene powder lining heated and melted at 0 to 300 ° C., not only the formation of a porous material by dehydration, cracking of the phosphoric acid film during dehydration and a decrease in the adhesion of the chemical conversion film, but also Mn and Zn in the phosphoric acid film. If the oxidation of these salts progresses, the corrosion potential will be reversed, leading to accelerated corrosion. The effect cannot be expected, and peeling and blistering are likely to occur in a short time due to a decrease in adhesive force due to formation of a porous material and cracking.
【０００８】従って、耐食性、被付着性、耐摩耗性など
に優れたポリエチレンライニングを従来使用してきた常
温付近の環境よりも耐ブリスタ性の面で問題となる高温
環境への適用拡大を図るためには付着性に優れ、かつ耐
食性に優れた下地処理方法の開発が望まれており、技術
的課題になっている。Accordingly, in order to expand the application to a high-temperature environment in which blister resistance is more problematic than in the environment near normal temperature where polyethylene linings excellent in corrosion resistance, adhesion, abrasion resistance, etc. have conventionally been used. There is a demand for the development of a base treatment method which is excellent in adhesion and corrosion resistance, and is a technical problem.
【０００９】本発明は上記技術水準に鑑み、かつ上記技
術的課題に応じて、高温環境下でも優れたポリエチレン
ライニングを施工できる下地処理方法を提供しようとす
るものである。The present invention has been made in consideration of the above-mentioned technical level, and has as its object to provide a base treatment method capable of applying an excellent polyethylene lining even in a high-temperature environment in accordance with the above technical problems.
【００１０】[0010]
【課題を解決するための手段】本発明はポリエチレン粉
体の溶融温度以上に予備加熱した炭素鋼からなる被ライ
ニング材に該ポリエチレン粉末を供給し、被ライニング
材の熱によって粉末を溶融させ、被ライニング材表面に
連続したポリエチレンの被膜を形成させるライニング方
法において、被ライニング材表面を脱脂洗浄し、水洗
後、塩酸酸洗し、水洗したのち、苛性ソーダ、オルトリ
ン酸ソーダ、亜硝酸ソーダからなる沸騰水溶液に浸漬
し、該被ライニング材表面にＦｅ3 Ｏ4 を主体とする被
膜を形成させ、次いで水洗後、ｐＨ４．５〜６．０の酸
性水溶液で中和処理し、水洗後乾燥させることを特徴と
するポリエチレン粉体ライニングの下地処理方法であ
る。According to the present invention, the polyethylene powder is supplied to a lining material made of carbon steel preheated to a melting temperature of the polyethylene powder or higher, and the powder is melted by the heat of the lining material. In the lining method of forming a continuous polyethylene film on the surface of the lining material, the surface of the lining material is degreased and washed, washed with water, then with hydrochloric acid, washed with water, and then a boiling aqueous solution comprising caustic soda, sodium orthophosphate, and sodium nitrite. To form a film mainly composed of Fe 3 O 4 on the surface of the material to be lined, then washed with water, neutralized with an acidic aqueous solution having a pH of 4.5 to 6.0, washed with water, and dried. Of the polyethylene powder lining.
【００１１】本発明は被ライニング材の表面を脱脂洗浄
し水洗後、塩酸酸洗し、水洗して清浄にし、濃厚な苛性
ソーダ溶液にオルトリン酸ソーダ、亜硝酸ソーダを加え
た沸騰水溶液中に一定時間浸漬し、被ライニング材表面
にＦｅ3 Ｏ4 を主体とする均一で緻密な黒色被膜を形成
させる。次いで、被ライニング材表面に付着した前記苛
性ソーダ水溶液を水で洗い流したのち、ｐＨ４．５〜
６．０に調整した水溶液で中和処理するポリエチレン粉
体ライニングの下地処理方法である。According to the present invention, the surface of the material to be lined is degreased and washed, washed with water, washed with hydrochloric acid, washed with water, and then cleaned in a boiling aqueous solution obtained by adding sodium orthophosphate and sodium nitrite to a concentrated sodium hydroxide solution. It is immersed to form a uniform and dense black coating mainly composed of Fe 3 O 4 on the surface of the lining material. Next, the aqueous solution of caustic soda adhering to the surface of the material to be lined is washed away with water, and the pH is adjusted to 4.5 to 4.5.
This is a method of preparing a polyethylene powder lining that is neutralized with an aqueous solution adjusted to 6.0.
【００１２】本発明の脱脂、酸洗し、水洗後、塩酸酸洗
し水洗するのは、次工程の耐熱性、耐食性に優れ、付着
力に優れたＦｅ3 Ｏ4 を均一に被ライニング材表面に形
成させるためである。The degreasing, pickling, water washing, hydrochloric acid pickling and water washing of the present invention are the same as those in the next step, except that Fe 3 O 4, which is excellent in heat resistance, corrosion resistance and adhesion, is uniformly coated on the surface of the lining material. It is for forming it.
【００１３】被ライニング材表面に均一で緻密な耐熱
性、耐食性及び付着力に優れたＦｅ3Ｏ4 被膜を形成す
るためには苛性ソーダ４０〜５０ｗｔ％、オルトリン酸
ソーダ５〜１５ｗｔ％、亜硝酸ソーダ２〜８ｗｔ％の沸
騰水が用いられるが、好ましくは苛性ソーダ４５ｗｔ
％、オルトリン酸ソーダ１０ｗｔ％、亜硝酸ソーダ５ｗ
ｔ％の沸騰水であり、結晶粒径の均一なＦｅ3 Ｏ4 被膜
が形成される。In order to form a uniform and dense Fe 3 O 4 film excellent in heat resistance, corrosion resistance and adhesion on the surface of the lining material, 40 to 50 wt% of caustic soda, 5 to 15 wt% of sodium orthophosphate, and sodium nitrite 2-8 wt% boiling water is used, preferably 45 wt.
%, Sodium orthophosphate 10wt%, sodium nitrite 5w
It is t% boiling water, and an Fe 3 O 4 film having a uniform crystal grain size is formed.
【００１４】[0014]
【作用】本発明は被ライニング材の表面を脱脂、酸洗
し、水洗後、塩酸酸洗し、水洗して清浄にし、この面に
耐熱、耐食性に優れ、付着力にも優れているＦｅ3 Ｏ4
の均一で緻密な被膜を形成しており、ポリエチレン粉体
の熱溶融時に従来生じていた局部的な酸化膜の形成がな
く、高温環境に使用した場合でもＦｅ3 Ｏ4 の均一膜に
よって母材の腐食が抑制されるため、剥離やブリスタを
生じることなく、長期間の使用に耐えるポリエチレン粉
体ライニング材を提供することができる。DETAILED DESCRIPTION OF THE INVENTION The present invention degreasing the surface of the lining material, pickled, washed with water and hydrochloric acid pickling, water washing and then cleaned, heat to this surface, excellent corrosion resistance, Fe 3 which is excellent in adhesion O 4
A uniform and dense film is formed, there is no local oxide film formed conventionally when the polyethylene powder is melted by heat, and even when used in a high temperature environment, the base material is formed by a uniform film of Fe 3 O 4. Therefore, it is possible to provide a polyethylene powder lining material that can withstand long-term use without causing peeling or blistering.
【００１５】本発明において、被ライニング材表面にＦ
ｅ3 Ｏ4 を主体とする被膜を形成させ次いで水洗後、ｐ
Ｈ４．５〜６．０の酸性水溶液で中和処理を行うが、こ
の処理によってポリエチレンライニングの付着力が大巾
に向上できるのである。ｐＨが４．５未満の水溶液で中
和した場合にはＦｅ3 Ｏ4 被膜の防食性が著しく悪くな
る。またｐＨが６．０を越えて高い水溶液ではＦｅ3 Ｏ
4 被膜に付着しているアルカリ成分の中和能力が低くな
り、ポリエチレンライニングの付着力が低下する。な
お、前記中和処理に用いられる酸性水溶液には無機酸、
有機酸などが適用される。In the present invention, the surface of the material to be lined is F
After forming a film mainly composed of e 3 O 4 and then washing with water, p
The neutralization treatment is performed with an acidic aqueous solution of H4.5 to 6.0, and this treatment can greatly improve the adhesion of the polyethylene lining. When neutralized with an aqueous solution having a pH of less than 4.5, the anticorrosiveness of the Fe 3 O 4 coating is significantly deteriorated. In an aqueous solution having a high pH exceeding 6.0, Fe 3 O
(4) The ability to neutralize the alkali component adhering to the coating is reduced, and the adhesion of the polyethylene lining is reduced. The acidic aqueous solution used for the neutralization treatment includes an inorganic acid,
Organic acids and the like are applied.
【００１６】[0016]
【実施例】厚さ３ｍｍ、直径１２０ｍｍの炭素鋼板を６
０℃のオルソケイ酸ソーダ３％溶液に１０分間浸漬し脱
脂洗浄したのち、温水洗浄し、次いで５０℃の塩酸５％
溶液に１０分間浸漬したのち、９０℃の温水で洗浄し
た。EXAMPLE A 6 mm thick carbon steel sheet having a thickness of 3 mm and a diameter of 120 mm was prepared.
Immerse in a 3% solution of sodium orthosilicate at 0 ° C for 10 minutes, degrease and wash, wash with warm water, and then add 5% hydrochloric acid at 50 ° C.
After being immersed in the solution for 10 minutes, it was washed with 90 ° C. warm water.
【００１７】次いで、苛性ソーダ４５ｗｔ％、オルトリ
ン酸ソーダ１０ｗｔ％、亜硝酸ソーダ５ｗｔ％、水４０
ｗｔ％からなる溶液を１３５〜１４５℃に加熱した処理
槽に２０分間浸漬した。浸漬後の鋼板を温水で洗浄した
のち、ｐＨが４．５〜６．０に調整したクエン酸水溶液
に常温で１分間浸漬し、次いで８０℃の温水に１０秒間
浸漬したのち熱風で乾燥した。前記処理後の炭素鋼の表
面には１〜２μｍのＦｅ3 Ｏ4 の均一黒色被膜が形成さ
れている。Next, caustic soda 45 wt%, sodium orthophosphate 10 wt%, sodium nitrite 5 wt%, water 40
The solution consisting of wt% was immersed in a treatment tank heated to 135 to 145 ° C. for 20 minutes. After the steel plate after immersion was washed with warm water, it was immersed in a citric acid aqueous solution whose pH was adjusted to 4.5 to 6.0 at normal temperature for 1 minute, then immersed in 80 ° C warm water for 10 seconds, and then dried with hot air. A uniform black coating of 1 to 2 μm of Fe 3 O 4 is formed on the surface of the carbon steel after the treatment.
【００１８】このＦｅ3 Ｏ4 被膜を形成させた炭素鋼板
を２５０℃±１０℃に熱板上で加熱したのちメルトフロ
レート３．０ｇ／１０ｍｉｎで平均粒径１００μｍのポ
リエチレン粉体を前記下地処理をした面に均一に散布
し、１ｍｍ厚のポリエチレンライニング膜を形成させ
た。表１に前記下地処理における中和処理条件を各種変
えてポリエチレンライニングした場合の接着強さ測定結
果を示す。The carbon steel sheet on which the Fe 3 O 4 film is formed is heated on a hot plate at 250 ° C. ± 10 ° C., and then polyethylene powder having a melt flow rate of 3.0 g / 10 min and an average particle diameter of 100 μm is subjected to the above-mentioned base treatment. Was sprayed uniformly on the surface subjected to the above to form a polyethylene lining film having a thickness of 1 mm. Table 1 shows the results of measuring the adhesive strength when polyethylene lining was performed under various conditions of the neutralization treatment in the base treatment.
【００１９】また、前記表１の下地処理条件で下地処理
した各鋼板の上に１ｍｍ厚のポリエチレンライニングし
た供試材を用いて、ライニング側にｐＨ０．５の硫酸溶
液を入れ６０℃に加熱し、ライニングをしていない鋼板
側を２０℃の冷却水で冷却した条件下で、ブリスタが発
生するまでの期間を測定した。Further, using a test material in which a 1 mm-thick polyethylene lining was applied to each steel sheet which had been subjected to the surface treatment under the conditions described in Table 1, a sulfuric acid solution having a pH of 0.5 was placed on the lining side and heated to 60 ° C. Under a condition in which the unlined steel plate side was cooled with cooling water at 20 ° C., a period until blisters were generated was measured.
【００２０】その結果を従来のリン酸亜鉛系化成処理面
にポリエチレン粉体をライニングした参考材にブリスタ
が発生するまでの期間との倍率として表２に示した。The results are shown in Table 2 as a magnification with respect to a period until blisters are generated in a reference material in which a conventional zinc phosphate-based chemical conversion treatment surface is lined with polyethylene powder.
【００２１】[0021]
【表１】 [Table 1]
【００２２】[0022]
【表２】 [Table 2]
【００２３】[0023]
【発明の効果】本発明の下地処理を適用することによ
り、従来剥離やブリスタ発生が問題となり実用し難かっ
た５０〜６０℃の環境にポリエチレン粉体ライニングが
適用可能になった。ポリエチレン粉体ライニングは前記
環境条件に用いられる他の樹脂（熱硬化性樹脂）ライニ
ングやゴムライニングに比べて生産コストも低く、樹脂
ライニングやゴムライニングで施工できないような小口
径の配管内面にも施工できる利点もあり、本発明により
ポリエチレン粉体ライニングの適用範囲の拡大が見込ま
れることから、その工業的効果は大きく、かつ長期寿命
確保による信頼性向上効果も大きい。By applying the undercoating treatment of the present invention, the polyethylene powder lining can be applied to an environment of 50 to 60 ° C., which has conventionally been difficult due to peeling and blister generation. Polyethylene powder lining has a lower production cost than other resin (thermosetting resin) linings and rubber linings used in the above-mentioned environmental conditions, and is also applied to the inside of small-diameter pipes that cannot be installed with resin lining or rubber lining Since the present invention is expected to expand the applicable range of the polyethylene powder lining, the present invention has a great industrial effect and a great effect of improving reliability by ensuring a long life.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｃ２３Ｃ 22/62 Ｃ２３Ｃ 22/62 22/83 22/83 (56)参考文献 特開 昭54−40837（ＪＰ，Ａ) 特開 平３−80969（ＪＰ，Ａ) 特公 昭46−26843（ＪＰ，Ｂ１) (58)調査した分野(Int.Cl.7，ＤＢ名) B05D 1/00 - 7/26 C23C 22/00 - 22/86 ────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. 7 Identification symbol FI C23C 22/62 C23C 22/62 22/83 22/83 Hei 3-80969 (JP, A) JP 46-26843 (JP, B1) (58) Fields investigated (Int. Cl. 7 , DB name) B05D 1/00-7/26 C23C 22/00-22 / 86
Claims (1)
加熱した炭素鋼からなる被ライニング材に該ポリエチレ
ンの粉末を供給し、被ライニング材の熱によって粉末を
溶融させ、被ライニング材表面に連続したポリエチレン
の被膜を形成させるライニング方法において、被ライニ
ング材表面を脱脂洗浄し、水洗後、塩酸酸洗し、水洗し
たのち、苛性ソーダ、オルトリン酸ソーダ、亜硝酸ソー
ダからなる沸騰水溶液に浸漬し、該被ライニング材表面
にＦｅ3 Ｏ4 を主体とする被膜を形成させ、次いで水洗
後、ｐＨ４．５〜６．０の酸性水溶液で中和処理し、水
洗後乾燥させることを特徴とするポリエチレン粉体ライ
ニングの下地処理方法。1. The polyethylene powder is supplied to a lining material made of carbon steel which has been preheated to a melting temperature of the polyethylene powder or higher, and the powder is melted by the heat of the lining material and is continuously formed on the surface of the lining material. In the lining method of forming a polyethylene coating, the surface of the lining material is degreased and washed, washed with water, pickled with hydrochloric acid, washed with water, and then immersed in a boiling aqueous solution containing caustic soda, sodium orthophosphate, and sodium nitrite. A polyethylene powder lining, characterized in that a film mainly composed of Fe 3 O 4 is formed on the surface of the lining material, then washed with water, neutralized with an acidic aqueous solution having a pH of 4.5 to 6.0, washed with water, and dried. Underlayer treatment method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10764192A JP2999061B2 (en) | 1992-04-27 | 1992-04-27 | Surface treatment method for polyethylene powder lining |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10764192A JP2999061B2 (en) | 1992-04-27 | 1992-04-27 | Surface treatment method for polyethylene powder lining |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05301075A JPH05301075A (en) | 1993-11-16 |
| JP2999061B2 true JP2999061B2 (en) | 2000-01-17 |
Family
ID=14464348
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10764192A Expired - Fee Related JP2999061B2 (en) | 1992-04-27 | 1992-04-27 | Surface treatment method for polyethylene powder lining |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2999061B2 (en) |
-
1992
- 1992-04-27 JP JP10764192A patent/JP2999061B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05301075A (en) | 1993-11-16 |
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