鍍鋅件用什麼偶聯劑處理

『壹』 熱鍍鋅起白粉是什麼原因，應該怎麼處理。

在乾燥環境條件下服役或保存的熱鍍鋅成品是不會起白粉的，熱鍍鋅產品產生回白粉的原因，答主要是長期在潮濕且通風不暢環境條件下服役或存放的熱鍍鋅工件會產生白粉，俗稱「白銹」，這種白粉的主要成分是鹼式氯化鋅腐蝕產物。國家標准規定：「只要鍍層厚度大於規定值，表面允許有白銹（以鹼式氯化鋅為主的白色或灰色腐蝕產物）存在。這種情況通常不影響鍍鋅工件的使用，最簡單的處理方法是，先將產生白粉的工件用清水沖洗干凈，然後用白醋加適量清水對白粉部位進行擦拭即可。僅供參考
中鋅熱浸鍍.申建甫

『貳』 鋼板電鍍鋅後，用熱固性粉末塗料噴塗高溫固化後附著力為什麼很差

鍍鋅面上直接做塗裝（噴漆或噴塑）附著力本來就不好，這是由於鋅與有機塗層之間的界面偶聯能力太差造成的，因此，鍍鋅面上做塗裝通常都要做前處理（不單是清洗，是要形成有調節功能的前處理層），不過傳統做法的打毛、噴砂、磷化都是要犧牲大量的鋅，很大程度降低甚至失去了鍍鋅的意義。我們解決這一問題是在不破壞鋅的基礎上，解決塗裝附著力。如過有興趣，可聯系交流。 028-85483087

『叄』 怎樣去除鍍鋅層

去除鍍鋅層最常用的方法就是用鹽酸酸洗來除去，鋅在鹽酸中溶解十分迅速。為了節省成本，在電鍍廠里，都是用鋼鐵除銹用剩下來的廢酸退鋅。用鹽酸除去電鍍鋅層通常只需幾十秒時間，除熱浸鋅或噴鋅，因為這兩種鋅層較厚，除鋅時間略為長一些。

當把鋼鐵工件浸入450℃左右的熔融鋅液時，常溫下的工件吸收鋅液熱量，達到200℃以上時，鋅和鐵的相互作用逐漸明顯，鋅滲入鐵工件表面。

從宏觀角度看，上述過程表現為工件浸入鋅液，鋅液面出現沸騰，當鋅鐵反應逐漸平衡，鋅液面逐漸平靜。工件被提出鋅液面，工件溫度逐漸降低至200℃以下時，鋅鐵反應停止，熱鍍鋅鍍層形成，厚度確定。

(3)鍍鋅件用什麼偶聯劑處理擴展閱讀：

對於表面光滑的3mm以下薄鋼板，工業生產中得到較厚的鍍層是困難的，另外，與鋼材厚度不相稱的鋅鍍層厚度會影響鍍層與基材的結合力以及鍍層外觀質量。

鋅層在大氣中的消耗是非常緩慢的，約為鋼鐵腐蝕速率的1/17至1/18，且是可預估的。其壽命遠超過其它任何塗層。

鍍層壽命在某一特定的環境下，主要視鍍層厚度而定。而鍍層厚度又受鋼鐵厚度而決定，即越厚的鋼鐵易得較厚的鍍層，故同一個鋼構中厚的鋼鐵部位一定也得到較厚的鍍層，以保證得到更長的壽命。

『肆』 鍍鋅管噴漆怎麼處理

鍍鋅件屬有色金屬，有色金屬較黑色全金屬附著力差；
市面上常用的醇酸鐵紅底漆專，環氧鐵屬紅底漆均不宜用於鍍鋅件，否則很容易脫落。需要特別指出的是：鍍鋅件上用醇酸類油漆，會發生皂化反應，不僅塗層失效，原有的鍍鋅層也會受損。

適用於鍍鋅件的底材（防銹底漆）有環氧鋅黃底漆（雙組份），環氧酯鋅黃底漆。

鍍鋅件刷漆時的前處理：
1、有條件的，可以對鍍鋅件磷化處理，或者先薄噴一層磷化底漆。
2、或者對光滑的鍍鋅件表面掃砂處理。
3、對鍍鋅工件、鍍鋅管表面用溶劑（即環氧鋅黃底漆稀釋劑）擦拭，以去除工件原油的保護層，並且增加潔凈度。
4、雙組份環氧鋅黃底漆：嚴格按照漆和固化劑的比例調配油漆，並且熟化30分鍾後，調制合適的施工粘度，即可噴塗。
單組份環氧酯鋅黃底漆：調制合適的施工粘度，以正確的施工方法施工。

『伍』 專業文章翻譯：熱浸鍍鋅層塗裝前表面處理

Preparing Hot Dip Galvanizing for Painting – It』s not Overly Complicated

熱浸鍍鋅層塗裝前表面處理-這並不太復雜

文章來自防腐塗裝良心網站KTAuniversity，原文鏈接  請點這里

Bare galvanizing provides excellent corrosion protection at a pH between 7 and 13, but corrosion of the zinc increases as the pH becomes more acidic (less than 7), or more alkaline (greater than 13).  When galvanizing is exposed to the lower or higher pH ranges, it should be painted.  Paint should also be applied when aesthetics is important, regardless of pH.  Unfortunately, when galvanizing is painted, paint failures can occur (Photo 1), but they are easy to prevent through proper surface preparation.

在 ph 值為7和13的情況下, 僅憑鍍鋅就可以提供優異的腐蝕保護, 但鋅的腐蝕會稿侍隨著 ph 值變酸性 (小於 7) 或鹼性 (大於 13) 而提高。 當鍍鋅層暴露在更低或更高的 pH 值范圍內時, 應當進行塗裝。 當外觀比較重要時, 無論 pH 值如何, 也應該塗裝。 不幸的是, 對鍍鋅表面塗裝時, 很可能發生塗層失效 (照片 1), 但通過適當的表面處理這很容坦斗易防止。

Photo 1 – Typical failure of paint to galvanizing e to lack of surface preparation.

照片 1-由於缺乏表面處理造成的典型塗層失效。

Surface preparation is the key to assuring successful coating adhesion and performance.  The extent of preparation required depends on the answers to these four questions:

Was the galvanizing passivated?

Is the galvanizing new?

Is the galvanizing partially weathered?

Is the galvanizing aged?

表面處理是保證塗層附著力和性能的關鍵。所需處理的程度取決於對以下四個問題的回答:

鍍鋅鍵信吵層鈍化處理了嗎？

鍍鋅層是新的嗎？

鍍鋅層是否部分風化？

鍍鋅層是否老化？

Passivating Treatments – Passivation is a common practice used at the time of galvanizing to rece the formation of white storage stain.  Unfortunately, passivating treatments applied to galvanizing (especially chromate treatments) can interfere with the adhesion of coatings.  If the galvanized steel is going to be painted, the galvanizer should be notified in advance, so that the passivation step can be eliminated.  Frequently, however, parts have already been galvanized and the user does not know whether a treatment was applied.  When in doubt, the surface should be tested.  A suitable procere is provided in SSPC-SP16, Brush-Off Blast Cleaning of Coated and Uncoated Galvanized Steel, Stainless Steels, and Non-Ferrous Metals.」  Section 4.3.3 of the standard offers the following:

鈍化處理  – 鈍化是鍍鋅時常用的一種方法，以減少鍍鋅件儲存時白銹印跡的形成。不幸的是，對鍍鋅件的鈍化處理(特別是鉻酸鹽處理)會影響塗層的附著力。如果鍍鋅件要塗裝，應提前通知鍍鋅人員，以便取消鈍化步驟。然而，實際情況通常是部件已經鍍鋅完成但用戶不知道是否進行了鈍化處理。如有疑問，應對表面進行測試。SSPC - SP16中提供了一個合適的程序，即「塗裝和未塗裝鍍鋅件、不銹鋼和有色金屬表面的掃砂處理標准。」 該標准第4.3.3節規定如下：

If all three areas turn black immediately, there is no passivation on the surface. If the first area does not turn black within 10 seconds and the second and third areas turn black immediately, there is no passivation on the surface with the possible exception of light oil. If the first and second areas do not turn black within 10 seconds and the third area turns immediately, a passivator of some type is present.

If it is present, mechanical cleaning is typically required to remove it, although some of the etching/cleaning solutions discussed below suggest that they will also remove some treatments.  Before using them, it is recommended that the etching cleaner be applied to discrete areas followed by the testing described above to determine if the treatment is removed.  If the project schele permits, weathering of 12 to 18 months prior to painting, should also eliminate any treatment that may have been present.

如果3個區域均立刻變黑，則表面沒有鈍化處理。如果第1個區域沒有在10秒內變黑，而第2和第3區域立即變黑，則表面沒有鈍化處理，但可能有輕微的油漬存在。如果第1和第2區域沒有在10秒內變黑，而第3區域立即變黑，則表面有過鈍化處理。

如果檢測有過鈍化處理，則通常需要機械工具來清理，盡管後面提到的一些蝕刻/清洗液也能去除某些鈍化層。如果使用蝕刻清洗液，建議先在小塊區域試驗，隨後進行上述測試，以確定是否去除了鈍化層。如果項目進度允許，塗裝前風化了12至18個月的構件也應去除可能存在的鈍化層。

New and Partially Weathered Galvanizing – If the age of the galvanizing is less than approximately 48 hours, it may be possible to coat it as is, but if it is weathered between a couple days and approximately one year (termed partially weathered), surface preparation will be required.  Two methods that are commonly used to prepare the galvanizing are cleaning/etching with a phosphoric acid/detergent blend and abrasive blast cleaning.

Etching solutions are used to clean, ll, and roughen the surface for proper coating adhesion.  The solution is applied to the surface, typically scrubbed with a synthetic abrasive pad, thoroughly rinsed, and force dried.  Examples of solutions can be found in the Master Painters Institute (MPI) qualified procts list #25, Cleaner, Etching, for Galvanized Metal ( http://www.specifypaint.com/APL/paintinfo_APL_new/MpiNumber.asp?ID=25000 ).

新的和部分風化的鍍鋅層 –    如果鍍鋅時間小於約48小時，可以直接塗裝，但如果鍍鋅層經過在幾天至約一年之間的風化(稱為部分風化)，則需要進行表面處理。通常用於鍍鋅件的兩種表面處理方法是噴砂清理和用磷酸/洗滌劑混合物進行清理/蝕刻。

蝕刻清洗液用於表面清理、表面暗化和粗糙化以獲得適當的塗層附著力。將溶液施加到表面上，通常用合成研磨片研磨，徹底沖洗，並烘乾乾燥。溶液種類可在「Master Painters Institute ( MPI )」認證產品列表#25「鍍鋅金屬的蝕刻清洗液」中找到。( http://www.specifypaint.com/APL/paintinfo_APL_new/MpiNumber.asp?ID=25000 )

Abrasive blast cleaning is performed according to SSPC-SP16.  Excerpts from a few paragraphs of the standard describing the cleaning of bare, uncoated metal (galvanizing) are repeated below.  The sentences that were redacted address the criteria for any paint remaining on the surface, which is not applicable to this article.

噴砂清理根據SSPC - SP16進行。以下是標准中描述清理裸露未塗裝金屬(已鍍鋅)的幾段摘錄。節略的部分是關於表面殘留油漆的標准，不適用於本文因此省略。

Paragraph 4.3.1 of the standard requires the removal of wet storage stain by means other than blast cleaning since the 「dwell time」 required to remove it by blast cleaning can damage the galvanizing.  Other methods are addressed in a non-mandatory Appendix.  Appendix Section A3 indicates that salts from wet storage stain can be removed with a nylon brush and water, or a dilute solution of acetic or citric acid, lime juice, or white vinegar, followed by rinsing with a large amount of water.

Appendix Section A8.1 indicates that to rece the risk of damage, blast cleaning is done with relatively low nozzle pressures (A8.2) and a softer abrasive with a Mohs hardness of 5 or less (A8.1.1.).

Appendix Section A9 recommends that the thickness of the galvanizing be measured before blast cleaning and again after blast cleaning to confirm that it meets the specified thickness.  The thickness requirements may be found in the procurement documents, or as required in ASTM A123, Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Procts, or ASTM A153/153M, Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware.

The Appendix (A9.2) cautions that in the presence of moisture, zinc oxides can form quickly on the surface after preparation, so it should remain dry, and painted as soon as possible.  The same recommendations for a minimum 5°F (3°C) spread between surface temperature and dew point temperature when preparing steel (steel temperature being the higher of the two), also apply to galvanizing.

該標准第4.3.1段要求通過噴砂清理以外的方式清除儲存時產生的白銹印跡，因為噴砂清理白銹印跡所需的「停留時間」可能會損壞鍍鋅層。其他方法在非強制性附錄中討論。附錄部分A3指出，儲存時產生的白銹印跡可以用尼龍刷和水，或乙酸或檸檬酸、檸檬汁或白醋的稀溶液除去，然後用大量水沖洗。

附錄部分A8.1指出，為了降低鋅層破壞風險，噴砂清理採用相對較低的噴嘴壓力( A8.2 )和莫氏硬度為5或更低的較軟磨料( A8.1.1 )。

附錄A9建議在噴砂清理前和噴砂清理後測量鍍鋅層厚度，以確認其符合規定膜厚。厚度要求見采購文件，或ASTM A123《鋼鐵製品鍍鋅(熱浸鍍鋅)標准規范》或ASTM A153/153M《鋼鐵五金件鍍鋅(熱浸鍍鋅)規范》。

附錄( A9.2 )警告稱，在潮濕條件下，噴砂清理後會在表面會迅速形成鋅氧化物，因此應保持乾燥，並盡快塗裝。與鋼結構表面處理相同，鍍鋅層表面處理時同樣建議表面溫度超出露點溫度至少5°F ( 3°C )。

Aged Galvanizing – When galvanizing has weathered for 12 to 18 months, the surface will have oxidized and can often be prepared for painting by pressure washing alone.  The key is to remove surface dirt and debris as well as zinc salts and confirm that the surface is ll (photo 2).

鍍鋅層老化  – 當鍍鋅層已經風化12至18個月時，表面將被氧化，並且通常只需要高壓清洗處理就可以准備塗裝。關鍵是清除表面污物和鋅渣以及鋅鹽，並確認表面暗化(圖2 )。

Photo 2 – Exterior surfaces of the galvanizing have weathered and can likely be painted after pressure washing to remove the salts, but note the lack of oxidation and the visible spangle in the in the protected area (red arrow).  A test patch should be applied to determine if the adhesion is adequate without roughening and lling the surface.

圖2– 鍍鋅層的外表面已經風化，可以在高壓清洗除去鹽分後進行塗裝。但請注意保護區(紅色箭頭)內氧化物不多，有可見亮色的金屬鋅，應在該區域小范圍塗漆測試，以確定未粗糙暗化的表面塗料附著力是否足夠。

Depending on the condition of the steel, 3,000 psi with a rotating tip may be adequate, but it』s best to apply a test patch of the coating after cleaning and check the adhesion to make certain.  If there is any doubt regarding the adhesion of the coating, either of the methods described above for partially weathered galvanizing (etching cleaner or SP-16 Brush-Off Blast) should be used.

根據鋼材（表面高壓沖水）的經驗，旋轉噴嘴的壓力在3000psi（約20MPa）應該足夠，但最好在鋅層表面高壓沖水後小范圍塗漆測試，並檢查附著力以確保合格。如果對塗層的附著力有任何疑問，則應使用上述部分風化後鍍鋅層的任一表面處理方法(蝕刻清洗液或SP-16掃砂)。

Conclusion – Most coating failures on galvanizing are the result of poor adhesion of the coating to the galvanizing.  Poor adhesion is typically caused by a lack of roughening of the smooth galvanizing, an abundance of zinc salts beneath the coating film, or the presence of a passivating treatment that inhibits adhesion of the coating. When properly prepared, coatings will adhere well to galvanizing and improve the aesthetics and corrosion protection afforded by the galvanizing.  This article described a few common methods or preparing galvanizing for painting.  Other methods are described in:

ASTM D6386, Standard Practice for Preparation of Zinc (Hot-Dip Galvanized) Coated Iron and Steel Proct and Hardware Surfaces for Painting

ASTM D7396, Standard Guide for Preparation of New, Continuous Zinc-Coated (Galvanized) Steel Surfaces for Painting

結論 – 鍍鋅過程中的大多數塗層失效是由於塗層與鍍鋅層的附著力差造成的。附著力差通常是由於光滑鍍鋅層的粗糙度不足、塗層下面鋅鹽的大量存在或抑制塗層粘附的鈍化處理而引起的。經過適當的塗裝前表面處理，塗層將很好地粘附到鍍鋅層上，並改善鍍鋅層的美觀性和防腐性。本文介紹了幾種常用的塗裝前鍍鋅層表面處理方法。其他方法記錄於如下標准:

ASTM D6386, 鍍鋅(熱浸鍍鋅)鋼鐵製品和五金件塗裝前表面處理的標准操作規程

ASTM D7396, 新的連續鍍鋅鋼材塗裝前表面處理的標准指南

原文作者介紹：

Ken Trimber is the President of KTA-Tator, Inc. He is Chairman of the SSPC Surface Preparation Committee and the SSPC Visual Standards Committee, as well as a member of the SSPC Standards Review Committee and ASTM DOl responsible for developing, reviewing and approving standards like the ones described in this article. He can be reached at [email protected]

ken Trimber，KTA-Tator公司的總裁，SSPC表面處理委員會和SSPC目視標准委員會主席，SSPC標准審查委員會和ASTM DOl成員，負責制定、審查和批准類似文中所述的標准。作者郵箱地址  [email protected]

『陸』 戶外鍍鋅鋼管油漆易脫落怎麼解決，刷什麼油漆不易脫落

一、鍍鋅件屬有抄色金屬，有色金屬較黑襲色全金屬附著力差；市面上常用的醇酸鐵紅底漆，環氧鐵紅底漆均不宜用於鍍鋅件，否則很容易脫落。需要特別指出的是：鍍鋅件上用醇酸類油漆，會發生皂化反應，不僅塗層失效，原有的鍍鋅層也會受損。適用於鍍鋅件的底材（防銹底漆）有環氧鋅黃底漆（雙組份），環氧酯鋅黃底漆。
二、刷漆時的前處理：
1、有條件的，可以對鍍鋅件磷化處理，或者先薄噴一層磷化底漆。
2、或者對光滑的鍍鋅件表面掃砂處理。
3、對鍍鋅工件、鍍鋅管表面用溶劑（即環氧鋅黃底漆稀釋劑）擦拭，以去除工件原油的保護層，並且增加潔凈度。
4、雙組份環氧鋅黃底漆：嚴格按照漆和固化劑的比例調配油漆，並且熟化30分鍾後，調制合適的施工粘度，即可噴塗。

『柒』 鍍鋅板怎麼噴漆

鍍鋅板表面塗普通的漆容易脫落，用現在市場上最多的ED1000鍍鋅板專用油漆為例，

鍍鋅板油漆工方法如下：

（1）採用配套溶劑擦拭鍍鋅板表面，去除油污油脂，防止影響附著力，如果有銹蝕打磨干凈即可，無需整體噴砂或打磨

（2）塗裝ED1000環氧底漆，將油漆與固化劑按照配比混合，加入適量稀釋劑，攪拌均勻，噴塗達到要求的膜厚

（3）塗裝配套面漆，以PU800丙烯酸聚氨酯面漆為例，將油漆與固化劑按照配比混合，加入適量稀釋劑，攪拌均勻，噴塗達到要求的膜厚

（4）檢查漆膜厚度是否達標，顏色是否均勻一致，有無漏塗、起泡等問題，發現後及時修補

注意事項：

（1）環境溫度在5-40℃，相對空氣濕度不大於75%

（2）每道油漆塗裝間隔為表干時間，底漆與面漆塗裝間隔為24小時為宜

（3）底漆與面漆均採用專用固化劑與稀釋劑，不可混用

（4）混合好的漆料在4小時內用完，避免塗料膠化

『捌』 鍍鋅件生銹後怎麼除銹

鍍鋅件生銹後怎麼除銹都沒有用，因為鋅層被氧化了，除銹後鋅層也沒有了，所以，唯一的辦法，就是重新鍍鋅。