Metal finishing Q&As since 1989
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Are there any methods known to make an electrogalvanized Galvannealed alloy?
February 25, 2010
Two other students and me are working on an electrogalvanized Galvannealed alloy for a company. The company works with the electrogalvanized manufacturing method. They want to know if it is possible to make a Galvannealed (ZF) alloy out of an electrogalvanized Zn/Fe alloy.
We only know that it is possible to make a Galvannealed alloy out of a hot-dipped alloy.
So are there any methods known, how to make an electrogalvanized Galvannealed alloy?
With kind regards
university student - Germany
Hi, Tobias. This sounds like a semantics question as much as a technical issue. In other words, are you trying to be able to "get away with" calling this surface "Galvanneal" or are you trying to match the properties of hot-dip galvanneal? Which properties? Certainly a zinc plating that is not as thick as hot dip galvanizing would fail the "equivalent corrosion resistance" property, but zinc-iron electroplating is common, and coatings of .0003" (about equal to 100-120 g/m2) sound possible. So ignoring the word "galvanneal", what are you actually trying to do? Thanks.
Regards,
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
February 25, 2010
March 2, 2010
Hi finishing.com visitors,
my name is Tobias, you can call me Toby.
I am working at a components suppliers company in Germany.
Since a couple of years we are working with a new method of rolling steel sheets. It is called ̣tailor rolling". With this rolling method you can produce steel sheets with different thicknesses. Last year we started to galvanize our products, the ̣tailored rolled blanks", in our company. Because of the different thicknesses of the coil we are working with the electrogalvanizing method.
Our problem is, that the automobile company in Asia are using a different kind of zinc-alloy, called Galvanealed-alloy (GA). They heat the hot-dip galvanized coil up to 550°C for a short time
(less than one minute). The zinc- and iron-alloy diffuse in that time. In the end you get a zinc-iron-alloy on the surface instead of an only zinc-alloy.
Now my question is: "Is it possible to produce a Galvanealed-alloy(GA), using an electrogalvanized zinc alloy instead of a hot-dip galvanized alloy?"
Maybe a similar method of coating exists. Does anybody know something about such a method?
Our company wants to develop the Asian marked with the "tailored rolled blanks", so it is important for us to know if it is possible to produce a galvannealed(GA) coated tailored rolled blank.
Thank you for your time.
With kind regards
Toby
engineer - Lennestadt, NRW, Germany
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