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 Post subject: Stone chip on bonnet rusting
PostPosted: Sun Jan 17, 2016 9:25 am 
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Joined: Wed Jun 25, 2014 7:23 am
Posts: 253
Location: County Durham
Noticed a big stone chip on the bonnet the other week and to my horror and surprise it seems to be rusting straight away. Anybody know if this will be covered by the warranty?

Thanks in advance

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 Post subject: Re: Stone chip on bonnet rusting
PostPosted: Sun Jan 17, 2016 9:32 am 
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Joined: Mon Dec 01, 2014 11:30 am
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Location: Netherlands, Utrecht area
I think rust is only covered when it comes from the inside out.


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 Post subject: Re: Stone chip on bonnet rusting
PostPosted: Sun Jan 17, 2016 11:09 am 
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Joined: Mon Dec 16, 2013 1:18 pm
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Location: Netherlands
Certainly not, this is caused by external damage.

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 Post subject: Re: Stone chip on bonnet rusting
PostPosted: Mon Jan 18, 2016 1:36 am 
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Joined: Fri Jul 18, 2014 4:46 am
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Why are you surprised? It's steel and will rust pretty quickly if the surface protection is broken.


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 Post subject: Re: Stone chip on bonnet rusting
PostPosted: Mon Jan 18, 2016 1:15 pm 
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Joined: Wed Jun 25, 2014 7:23 am
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Location: County Durham
My subaru is 10 years old, had plenty of stone chips on the front of the bonnet when i bought it but none had rusted. Just surprised it's gone right through the paint and primer I guess - must be thinner these days.

Any recommendations for repair specialists?

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 Post subject: Re: Stone chip on bonnet rusting
PostPosted: Tue Jan 19, 2016 2:39 am 
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Location: Netherlands
maby wrote:
Why are you surprised? It's steel and will rust pretty quickly if the surface protection is broken.

Not really. I used to drive Volvos quite a while back and it was remarkable how seldom rust spread from paintwork damage.

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 Post subject: Re: Stone chip on bonnet rusting
PostPosted: Tue Jan 19, 2016 1:53 pm 
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Joined: Tue Aug 05, 2014 1:32 pm
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jaapv wrote:
maby wrote:
Why are you surprised? It's steel and will rust pretty quickly if the surface protection is broken.

Not really. I used to drive Volvos quite a while back and it was remarkable how seldom rust spread from paintwork damage.


And shouldn't with fully galvanised parts - which I thought all cars were today. But if the chip penetrates through to the steel that spot will rust but no further, as you need oxygen to produce rust and the zinc coating is supposed to seal the surface.


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 Post subject: Re: Stone chip on bonnet rusting
PostPosted: Tue Jan 19, 2016 9:52 pm 
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greendwarf wrote:

And shouldn't with fully galvanised parts - which I thought all cars were today. But if the chip penetrates through to the steel that spot will rust but no further, as you need oxygen to produce rust and the zinc coating is supposed to seal the surface.


The zinc is actually a sacrificial coating not a sealer. It protects the steel because it is #30 on the periodic table where as iron (Fe) is 28. This makes the zinc anodic to the steel and will be consumed first in the form of a white chalky powder.

Zinc is actually quite porous compared to other coatings.

Cheers

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 Post subject: Re: Stone chip on bonnet rusting
PostPosted: Wed Jan 20, 2016 1:53 am 
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NAPpy wrote:
greendwarf wrote:

And shouldn't with fully galvanised parts - which I thought all cars were today. But if the chip penetrates through to the steel that spot will rust but no further, as you need oxygen to produce rust and the zinc coating is supposed to seal the surface.


The zinc is actually a sacrificial coating not a sealer. It protects the steel because it is #30 on the periodic table where as iron (Fe) is 28. This makes the zinc anodic to the steel and will be consumed first in the form of a white chalky powder.

Zinc is actually quite porous compared to other coatings.

Cheers

NAPpy


and, since the zinc is sacrificial and quite thin, it can make the damage look worse if it is not repaired quite quickly. If the paint is punctured in a small area and the zinc starts to erode, the metal directly under the paint damage will go quite quickly and the erosion can then extend out under the surrounding paint. Painted, galvanised steel is not maintenance free.


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 Post subject: Re: Stone chip on bonnet rusting
PostPosted: Wed Jan 20, 2016 7:06 am 
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Joined: Fri Oct 02, 2015 3:22 am
Posts: 385
Location: Chesterfield, Derbyshire, UK
david1972 wrote:
My subaru is 10 years old, had plenty of stone chips on the front of the bonnet when i bought it but none had rusted. Just surprised it's gone right through the paint and primer I guess - must be thinner these days.

Any recommendations for repair specialists?


'Chips Away' comes to mind.

JimB

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