熱鍍鋅發暗表面如何處理

㈠ 客戶有一批鍍鋅板表面不做任何處理，現在表面氧化有黑點，怎樣才能去掉黑點，顏色又一致呢

表面黑點有2點可能：
1、由於漏鍍原因造成的，就是說出現黑點的地方由於漏鍍回，使鐵離答子滲透出來發黑，這是顯示了鐵基體的顏色。修復方法：96%鍍鋅專用修復漆，先用砂紙打磨黑點部分，保證創口越小越好，再用鍍鋅漆修復，此漆修復後有鋅層，專業人員可以指點修復方法。
2、由於鍍鋅板表面腐蝕導致的發黑，原因是你的客戶鍍鋅板表面沒有經過任何處理，這樣的話如果在車間吊裝、或者周圍環境的影響遇到一些東西上面可能帶有的酸，就會腐蝕鍍鋅板表面，腐蝕的表面經過空氣的氧化很容易就會發黑，再經過濕潤空氣的腐蝕就能長出一層「白鹽」，就是鋅的鹼式碳酸鹽。這種發黑不能處理，如果打磨會導致大面積發黑，影響質量外觀。

朋友如果你覺得回答的可以給個推薦，謝謝！

㈡ 熱鍍鋅變色的處理

1. 只有重新二抄次鍍鋅才可以。

2. 熱鍍鋅（galvanizing） 也叫熱浸鋅和熱浸鍍鋅：是一種有效的金屬防腐方式，主要用於各行業的金屬結構設施上。是將除銹後的鋼件浸入500℃左右融化的鋅液中，使鋼構件表面附著鋅層，從而起到防腐的目的。

3. 熱鍍鋅工藝流程：成品酸洗-水洗-加助鍍液-烘乾-掛鍍-冷卻-葯化-清洗-打磨-熱鍍鋅完工。

㈢ 熱鍍鋅板表面發黑為什麼

熱鍍鋅板表面發黑是白銹進一步氧化形成的。

白銹產生的原因主要有：

（1）鈍化不良，鈍化膜厚度不夠或不均勻；

（2）表面未塗油或帶鋼表面殘留水分；

（3）卷取時帶鋼表面含有水分；

（4）鈍化未完全烘乾；

（5）在運輸或儲存中受潮或雨水淋濕；

（6）成品存放時間過長；

（7）鍍鋅板與其他酸鹼等腐蝕性介質接觸或存放在一起。

成品在庫中最長允許存放三個月，以避免存放過久產生氧化。

(3)熱鍍鋅發暗表面如何處理擴展閱讀

熱鍍鋅板，將薄鋼板浸入熔解的鋅槽中，使其表面粘附一層鋅的薄鋼板。主要採用連續鍍鋅工藝生產，即把成卷的鋼板連續浸在熔解有鋅的鍍槽中製成鍍鋅鋼板；合金化鍍鋅鋼板。這種鋼板也是用熱浸法製造，但在出槽後，立即把它加熱到500℃左右，使其生成鋅和鐵的合金被膜。這種鍍鋅板具有良好的塗料的密著性和焊接性。

熱鍍鋅按退火方式的不同可分為線內退火和線外退火兩種類型，又分別叫保護氣體法和熔劑法。

鋅層脫落的主要原因有：表面氧化、有硅化合物、冷扎乳化液太臟、NOF段氧化氣氛及保護氣體露點太高、空燃比不合理、氫氣流量偏低、爐子有氧滲入，帶鋼入鍋溫度偏低，RWP段爐壓偏低及爐門吸風、NOF段爐溫偏低，油脂蒸發不盡、鋅鍋鋁含量偏低、機組速度太快、還原不充分、鋅液中停留時間太短、鍍層偏厚。

㈣ 我是做鍍鋅絲的，最近鍍鋅絲一直不亮，發灰還有斑點，是怎麼回事希望同行或者技術人員能給點建議。急求

1）鍍鋅絲的原料；2）鍍鋅絲的原料前處理不穩定。

㈤ 熱鍍鋅鐵絲顏色不光亮,發黑發烏,怎麼辦

熱鍍鋅產品顏色發黑發烏的因素大體可分為兩大類，一方面工藝的問題，另一方面是材質的問題。這兩大類的因素都可以通過添加合金，和調整工藝溫度來得以控制。僅供參考。
中鋅熱浸鍍

㈥ 鍍鋅時鍍件凹窪處鍍層不光亮、發暗是何原因如何解決

鍍件的凹窪處都屬於低電流區。此區發暗不光亮的原因主要和解決辦法有以下幾個專： 1)電流小。加屬大電流至鍍件邊角上剛出現有氣體析出為止。 2)溶液溫度過高。用溫度計測量時，一般鍍液溫度超過40。C後這種現象比較常見。有報道說，加入30.409/L氯化銨可改善。 3)鍍液分散能力差。鹼性鍍鋅溶液中火鹼含量低，或氧化鋅含量高。氯化鉀鍍鋅時，氯化鉀含量低都會出現這些毛病。 4)光亮劑不足。光亮劑不足時，也表現出低電流區不光亮。如果加光亮劑不見效：應*l,JJtl開缸劑。 5)雜質的影響。鉛、銅、有機物雜質都會使低電流區不光亮。打霍爾槽片，使用總電流O.5A，鍍lOmin後經水洗和硝酸出光，低電流區發棕色證明是鉛。.黑色證明是銅，發白暗不光亮是有機雜質。前兩種用鋅紛處理，後一種打活性炭處理。

㈦ 請問鍍鋅鋼管打磨亮了，過幾天又會發烏怎麼辦

1. 鍍鋅鋼管打磨亮過幾抄天又會發烏解決方法：

   對鋼管表面進行處理（如塗一層瀝青漆、環氧類漆或槽封），以隔絕介質與鋅層的直接接觸。

2. 鍍鋅鋼管在實際使用中很少有進行打磨的，因為鍍鋅的目的就是為了防止生銹，防止發烏。

3. 鍍鋅鋼管分為冷鍍鋅鋼管、熱鍍鋅鋼管，冷鍍鋅鋼管已被禁用，後者還被國家提倡暫時能使用。熱鍍鋅鋼管廣泛應用於建築、機械、煤礦、化工、鐵道車輛、汽車工業、公路、橋梁、集裝箱、體育設施、農業機械、石油機械、探礦機械等製造工業。
   

㈧ 鍍鋅板表面變黑了能還原嗎

可以還原,找點稀鹽酸或者稀硫酸的溶液洗一下.

㈨ 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]

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