What might have caused this
What might have caused this
(OP)
Hi All,
This is a detail picture of a corrosion spot area on a cylinder's rod.
The cylinder is working in a marine environment.
I would like to know from any experience person, what they think it might
have caused this.
Thanks,
This is a detail picture of a corrosion spot area on a cylinder's rod.
The cylinder is working in a marine environment.
I would like to know from any experience person, what they think it might
have caused this.
Thanks,





RE: What might have caused this
RE: What might have caused this
Yes, it is AISI 630 with hart chrome treatment.
Thanks
RE: What might have caused this
as Swall said, there are enough cracks and porosity in it to allow the under lying metal to corrode.
In fact once corrosion starts the Cr makes it worse since it is more corrosion resistant it will force the steel to corrode faster.
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Plymouth Tube
RE: What might have caused this
So which material is the most indicated for a cylinder's rod in a marine environment?
Thanks
RE: What might have caused this
RE: What might have caused this
http://www.nurmi.fi/files/marine_and_offshore_EN.p...
RE: What might have caused this
RE: What might have caused this
The cylinder I'm investigating on has a rod made from 17-4PH (Nikrom brand). We had inquired the manufacturer of these rods and they came up with the theory of galvanic corrosion after we supplied the detailed drawing of the cylinder. They said that, because of an internal bearing made from bronze and because of the salty environment a galvanic corrosion has taken place between the bronze and the chrome plated rod. So basically they claim is the cylinder's manufacture design fault and not a material quality problem.
If anybody has any idea about this galvanic corrosion I will really appreciate to read their point of view.
thanks
RE: What might have caused this