Galvo corrugated steel sheet - white powdery bloom

A few weeks back, the local BM delivered me a few sheets of galvo corrugated wriggly tin sheet.
When we unloaded 'em and stacked 'em, they were covered with a white powdery bloom. I probably should have sent 'em back there and then, but didn't. We stacked 'em with enough space for air to circulate.
I've just started to look at 'em properly now. The bloom isn't cleaning off well at all, and has clearly gone through the galv in quite a few places.
A good cosmetic finish is required... The Domestic Customer is less than amused.
What think you to the reaction I'm likely to get when I go back to the (indie, just two outlets) BM?
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Adrian wrote:

A little bit of white bloom might be expected (zinc oxide) but if the galvanising has been compromised then it is not fit for purpose. If they replace it then check every sheet, otherwise money back and try elsewhere - maybe a sheet goods/roofing specialist where there is higher stock turnover compared to a BM
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On Tue, 01 Dec 2015 13:55:10 +0000, Bob Minchin wrote:

Went back, had a nice little chat, and then checked their store with 'em.
EVERY SINGLE 660mm wide - of all lengths - was the same. But they'd got a stack of ~1100mm wide - of various lengths - which was all immaculately spotlessly perfect. They'll deliver some sheets of that, and take back the other, in a day or two. No problem, very apologetic.
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Adrian wrote:

Good News - nice when things work out.
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On Tue, 01 Dec 2015 16:24:54 +0000, Bob Minchin wrote:

Just another reason to use the local indies.
Well, that and a 40-mile round trip to an "as-seen-on-tv" national shed.
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On Tue, 01 Dec 2015 15:58:59 +0000, Adrian wrote:

And, this afternoon, they've delivered the new and taken the old, no problem at all.
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Adrian wrote:

Excellent result. Of course this is the sort of service we should get all the time but because we don't it makes it all the more noteworthy and I'm sure you will continue to give them business.
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On Wed, 02 Dec 2015 17:20:18 +0000, Bob Minchin wrote:

Oh, yes. The other local BM is a similar distance from here. But they're part of a small regional chain now and, since they were taken over, they're just a bit more... corporate. Before, they were a little hole-in- the-wall Ronnie Barker and brown coats place.
But it's funny - there's some stuff I'll get from one and some from t'other, and I don't really know why.
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It could be it was not degreased correctly when it was plated. The presence of zinc is not a problem, but hols in the galv most certainly are.
The problem is I don't think they can legally use cadmium and pasivate these days to get that wonderful slightly coloured finish.
I supposes its like most stuff these days, prices cut and corners cut to match in the processing. I noticed some years ago that aerial clamps and hardware were not being galvanised as well as they used to be, resulting in the threads rusting after a few months and the surfaces pitting in a couple of years. Sigh. Brian
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On 01/12/2015 16:35, Brian-Gaff wrote:

Agreed. There are three main types of zinc coating: hot dip, electroplate, sheradize. I believe electroplate is much more common now and will be what you have on aerial clamps and quite possibly the corrugated sheets. You still get hot dip on agricultural stuff.

Correct. Not usually used on large stuff though.

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On Tuesday, 1 December 2015 20:14:57 UTC, newshound wrote:

shame it's toxic, it's probably the ultimate rustproofer
NT
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