[TowerTalk] Brown colored galvanized surface?

[K8RI]

On 9/14/2012 11:07 AM, Mark, K5ER wrote:
> He Steve,
>          Here in the Gulf South, sometimes on vertical tower but pretty
> often on horizontal sections waiting to be stacked, that brownish haze
> appears. Mostly, it is associated with proximity to hardwood trees,
> particularly Oaks. The galv surface is rarely compromised underneath.
> Comes off fairly easily with a pressure washer, but sometimes, when its
> been there for a few years we need to use something like a milk can
> brush. Everybody remembers what that is, right?

What I've seen was rust that had washed down the tower from something 
higher up.  The tower sections (in these cases) was not rusting, but was 
coated "very evenly" with rust. I never bothered to try and clean it. In 
one case it was from some painted, steel masting.  I've also seen it on 
galvanized 1 1/2" TV masting as well as painted steel TV masting which 
had paint peeling and the surface was rusting.  The TB-4 looked like it 
had been spray painted with a very thin coating of brown paint, or stain.

In none of the cases was the material itself rusted inside or out. At 
least not that I could detect. The surprising part was how evenly coated 
it had become after installation.

73

Roger (K8RI)


>
> 73,
> Mark, K5ER
>
>
>> 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.
>>
>> Cheers,
>> Steve     K7LXC
>
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