Galv rusts after a month?

[Fideliox]

Bought and installed galvanized ground gutters a month ago. It has barely rained since then but already lots of rust spots on the grid?! How is it possible? https://www.biltema.se/bygg/vvs/san...ing/markrannor/draneringsranna-1-m-2000063467

 

[Kane]

Bought and installed galvanized ground gutters a month ago. It has hardly rained since, but already lots of rust spots on the grate?! How is this possible? [link]

Where did you say you bought them?🤓

 

[Alfredo]

How is it possible?

Hard to see that there can be any other answer than that they have substandard quality. What does Biltema say?

 

[Lazze]

Bought and installed galvanized surface channels a month ago. It's barely rained since then but already a lot of rust spots on the grate?! How is that possible? [link]

Hi
Have you had anyone with an angle grinder nearby or dragged something metal over them so they've been contaminated?

 

[Fideliox]

Hello
You haven't had anyone with an angle grinder nearby or dragged something metal over them so they've become contaminated?

Definitely not. I've emailed Biltema, so let's see what they say. Clear rust spots where leaves have been lying for a while.

 

[trähandtag]

Unfortunately, it's not Biltema that has quality products. Sometimes okay, sometimes crap.

 

[Thomas_Blekinge]

Are these oak leaves? They contain tannic acid which can be quite aggressive.
Check if the edges of the sheet metal are cut/sheared after galvanization (bad) or before (better).
Sometimes there's cheating with zinc thickness.

 

[AndersS]

How does any salt from cars potentially dripping down in winter affect it?
Impact of road salt

 

[Thomas_Blekinge]

In a marine context, hot-dip galvanized performs quite well if it is in saltwater all the time (immersion zone). If it is in the splash zone or tidal zone with intermittent contact with saltwater, it is very aggressive.

 

[useless]

In a marine context, hot-dip galvanized materials perform quite well if they are in saltwater all the time (immersion zone). If they are in the splash zone or tidal zone with intermittent contact with saltwater, it is very aggressive.

TS Blltemarännor are galvanized, not hot-dip galvanized.

 

[AndersS]

If cars are parked here during the winter and have driven on salted roads, it can end up like in the OP pictures, is my interpretation.
OP, could that be the case?

 

[Fideliox]

If cars are parked here in winter and have driven on salted roads, it could end up like in the OP's pictures, that's my interpretation.
OP, could that be the case?

No, this is in the backyard garden, no salt there. As I mentioned, it hasn't rained much either.

I do have an oak tree nearby, though, and some leaves have fallen.

 

[z_bumbi]

Return to Biltema and buy some spray cans of "cold galvanizing." The layer of rust protection is simply too thin or damaged. It is cheaper to buy in a regular paint can but harder to reach and apply in even layers. If you can easily access them, I would brush paint the entire backside in several layers. More zinc on the surface provides better protection.

 

[mattoys]

TS Blltemarännor are galvanized, not hot-dip galvanized.

Hot-dip galvanized is galvanized, but not all galvanized is hot-dip galvanized.

 

[Thomas_Blekinge]

There is a bit of language confusion.
Hot-dip galvanizing is done by dipping the object into a bath of molten liquid zinc. Strictly speaking, it is not galvanizing because no electrical current is used through the object in the process.
Electroplating or electrogalvanizing, on the other hand, is an electrolytic process.
But in everyday (incorrect) language, hot-dip is referred to as hot-dip galvanised for the method of dipping in liquid zinc.