Ihr Partner für moderne und nachhaltige Feuerverzinkungstechnologie

𝐆𝐚𝐥𝐯𝐚𝐧𝐢𝐳𝐢𝐧𝐠 𝐏𝐫𝐨𝐜𝐞𝐬𝐬 𝐈𝐧𝐬𝐢𝐠𝐡𝐭𝐬 by Herwig GmbH
𝑃𝑖𝑚𝑝𝑙𝑒𝑠 - 𝑡ℎ𝑒𝑟𝑚𝑜𝑑𝑦𝑛𝑎𝑚𝑖𝑐𝑠 𝑎𝑡 𝑤𝑜𝑟𝑘 𝑖𝑛 𝑔𝑎𝑙𝑣𝑎𝑛𝑖𝑧𝑖𝑛𝑔

Beginning of week.
Morning shift started preparing everything for the scheduled production, full capacity.

First jig, comes in, into zinc. Some pimples, scattered.
Second jig, comes. More pimples - it is getting worse.
Third jig, not a single piece will be accepted, the defect is too intense!
Production comes to an halt. What changed for this to happen?

Pimples, sometimes also called floating dross, can appear suddenly and disappear just as quickly; yet, the real challenge begins when becomes part of daily production rather than some isolated episode.

Several factors can contribute or intensify this galvanizing defect:

• Zinc bath chemistry, namely iron content
• Working temperature and heating control
• Aluminium and Nickel concentration
• Melting of zinc and alloys
• Iron in flux, salt balance and drying
• Ash and dross management
• Skimming practices
• Material geometry

Pimples result from the interaction of pre-treatment, zinc bath conditions and operation in the process, and rarely are the problem themselves. They are the symptom of something in the process that has drifted away from its optimal operating conditions.

𝐻𝑒𝑟𝑤𝑖𝑔 𝐺𝑚𝑏𝐻 𝑠𝑢𝑝𝑝𝑜𝑟𝑡𝑠 𝑡ℎ𝑒 ℎ𝑜𝑡 𝑑𝑖𝑝 𝑔𝑎𝑙𝑣𝑎𝑛𝑖𝑧𝑖𝑛𝑔 𝑖𝑛𝑑𝑢𝑠𝑡𝑟𝑦 𝑤𝑖𝑡ℎ 𝑙𝑜𝑛𝑔-𝑡𝑒𝑟𝑚 𝑔𝑙𝑜𝑏𝑎𝑙 𝑒𝑥𝑝𝑒𝑟𝑖𝑒𝑛𝑐𝑒 𝑎𝑛𝑑 𝑎 ℎ𝑎𝑛𝑑𝑠-𝑜𝑛 𝑎𝑝𝑝𝑟𝑜𝑎𝑐ℎ 𝑎𝑐𝑟𝑜𝑠𝑠 𝑡ℎ𝑒 𝑐𝑜𝑚𝑝𝑙𝑒𝑡𝑒 𝑝𝑟𝑜𝑐𝑒𝑠𝑠.

Do you have a checklist of 𝒔𝒚𝒎𝒑𝒕𝒐𝒎𝒔 to be evaluated when pimples start to prevail? Or do you wait until them 𝒇𝒂𝒅𝒆 𝒂𝒘𝒂𝒚?

INDIAN bizz partner welcome!

𝐆𝐚𝐥𝐯𝐚𝐧𝐢𝐳𝐢𝐧𝐠 𝐏𝐫𝐨𝐜𝐞𝐬𝐬 𝐈𝐧𝐬𝐢𝐠𝐡𝐭𝐬 by Herwig GmbH
𝑍𝑖𝑛𝑐 𝑡𝑜 𝑎𝑠ℎ𝑒𝑠... 𝑚𝑜𝑛𝑒𝑦 𝑡𝑜 𝑑𝑢𝑠𝑡

Ash generation in hot dip galvanizing is inevitable but excessive generation is not. The difference lies in a few critical process parameters:

• Is there a dedicated drying equipment?
• The material is properly dried before entering the zinc bath?
• Does flux have the proper strength and about the ratio and iron content?
• Are the kettle workers trained and equipped to skim the zinc bath efficiently?
• How adequated is jigging for the geometry of material?

Every single bullet above influences how much zinc ends up on the steel... and how much ends up as ash.

Reducing ash generation is, therefore, not about a single aspect - is about controlling the process as a whole.

𝐻𝑒𝑟𝑤𝑖𝑔 𝐺𝑚𝑏𝐻 𝑠𝑢𝑝𝑝𝑜𝑟𝑡𝑠 𝑡ℎ𝑒 ℎ𝑜𝑡 𝑑𝑖𝑝 𝑔𝑎𝑙𝑣𝑎𝑛𝑖𝑧𝑖𝑛𝑔 𝑖𝑛𝑑𝑢𝑠𝑡𝑟𝑦 𝑤𝑖𝑡ℎ 𝑙𝑜𝑛𝑔-𝑡𝑒𝑟𝑚 𝑔𝑙𝑜𝑏𝑎𝑙 𝑒𝑥𝑝𝑒𝑟𝑖𝑒𝑛𝑐𝑒 𝑎𝑛𝑑 𝑎 ℎ𝑎𝑛𝑑𝑠-𝑜𝑛 𝑎𝑝𝑝𝑟𝑜𝑎𝑐ℎ 𝑎𝑐𝑟𝑜𝑠𝑠 𝑡ℎ𝑒 𝑐𝑜𝑚𝑝𝑙𝑒𝑡𝑒 𝑝𝑟𝑜𝑐𝑒𝑠𝑠.

Do you know how much zinc leaves your kettle through ash everyday? 📊