The authoritative public forum
  for Metal Finishing since 1989
-----

Anything Better Than Hot Dipped Galvanizing?

2000

Greetings!

We are looking for an alternative process to hot dipped galvanizing that can have the following ideal conditions:

1) smooth bright finish on parts (no matte finish);
2) can pass BS 117 salt and fog spray test (more than 2500 hours);
3) no need or minimal pretreatment of parts ;
4) uniform thickness along whole length of part (3 to 4 meters max);
5) if possible, no heating of zinc at plant all the time;
6) doesn't flake or clog threaded parts ;
7) low investment cost ;
8) no need or minimal waste water treatment ;
9) quick cooling in spite of high humidity environment ;
10) can handle minimum of 30 tons per month to 50 tons max, with expansion capability to 100 tons per month ; 11) 220 volts 3 phase 60 Hz power supply ;
12) drying process using least amount of cost of energy ;
13) can coat on inside and outside of hollow structures such as pipes,poles, or deep recession/holes (no faraday effect); 14) parts can be powder coated with PVC
15) galvanizing process can be semi-automated

Most parts to be "galvanized" are to be in electrical applications requiring outdoor exposure in coastal and/or mildly corrosive surroundings. We have heard of various problems associated with hot dipped galvanizing from the local galvanizing job shops and wish to avoid these before purchasing the whole in house plant system. It need not be 100% of the above conditions but the more the better. Thank you.

Anthony Austria
a steel company - Manila, Philippines

---

Dear Mr. Austria,

there is a process called Amazinc/ZNÛ which will meet your requirements except Item 1 and 13. All other requirements are reached. This process uses a special zinc powder which give you a coating similar to hot dip galvanizing with additional annealing. The equipment is heated only for the coating process itself. No pretreatment is necessary. More or less waste-free. Best regards,

Peter Kordt
TVT KORDT GMBH - Hagen, Germany
2000

---

Dear Mr. Peter Kordt,

Thank you for your reply. We are interested in your process and would like to reach you for your quotations and specifications.

I'm not sure if your process will have similar problems associated with hot dipped galvanizing such as drip runs,lumpiness and bubbles.

We had tried local zinc rich primers but mudcracking occurred on its zinc layers. We are planning to apply UL certification of our products and are concerned if your coating alternative can complement the UL standards.

Anthony Austria
a steel company - Manila, Philippines
2000

---

WE ARE INTERESTED IN AMAZINC/ZN 3/4 SUBSTITUTE FOR HOT DIP GALVANISE FOR THREADED COMPONENTS (HARDWARE)

KINDLY SEND QUOTATION & OPERATING PROCEDURE AS EARLY AS POSSIBLE

THANKS

WITH BEST Regards,

PRAVIN B BHADANE
- NASIK (MAHARASRA) India
2000