[Top] [All Lists]

Re: [TowerTalk] Brown colored galvanized surface?

To: <>
Subject: Re: [TowerTalk] Brown colored galvanized surface?
From: "Doug Scribner" <>
Date: Wed, 12 Sep 2012 16:22:16 -0400
List-post: <">>
     From the following site:

A thin brown surface staining sometimes occurs in service when the galvanized coating comprises entirely zinc-iron alloys as discussed under 'Dull grey coating'

     1.Dull Grey Coating
     General comment:Acceptable.
A dull grey appearance is caused by growth of the zinc-iron alloy layers through to the surface of the galvanized coating. Grey coating may appear as localized dull patches or lacework patterns on an otherwise normal galvanized coating or may extend over the entire surface. Dull grey coatings usually occur on steels with relatively high silicon content which are highly reactive to molten zinc. Dull grey coating are often thicker than the normal bright or spangled coatings and therefore give longer life. It is rarely possible for the galvanizer to minimise or control the development of dull grey coatings which is dependent basically on steel composition.

     Doug - K1ZO

----- Original Message ----- From: <>
To: <>
Sent: Wednesday, September 12, 2012 4:13 PM
Subject: [TowerTalk] Brown colored galvanized surface?

Howdy, TowerTalkians --

   On lots of old galvanized towers sometimes you wind  up with a brownish
colored surface. Can anyone tell me what it is? It's not rust  but
something else. Just curious. Tnx.

Steve     K7LXC


TowerTalk mailing list


TowerTalk mailing list

<Prev in Thread] Current Thread [Next in Thread>