Name that corrosion!
Name that corrosion!
(OP)
[apologies up front, it appears the photo link coding is not cooperating. For those bold enough to try the links, please repost them if both time and interest allow.]
This happens to be 4140 low alloy steel. The part imaged serves as the plug at the base of an isostatic press. The sealing surface is not shown, but is the surface opposite the large stain in the first two images.
This being the plug, it is at the bottom of the chamber barrel, and some process fluid [water, lubricant, and some anti-bacterial agent] tends to sit at whiles between cycles.
My wonder, [being the new guy with 'some' isopress experience] I would have expected them to use more lubricant. That said they have not seen such corrosion before. The machine was installed new in July 2013, and even just 1 month ago their was remarkably less corrosion evident.





RE: Name that corrosion!
Thanks all!
RE: Name that corrosion!
I am not sure of the composition of the screws, or the washers [possibly of the locking variety] used. All of them look pretty cruddy.
The rod shown in the first image, which I thought was not shown, hah, proceeds away from the plug to several points where various o-rings separate certain process areas. The rod terminates in a threaded tip, which connects the rob/plug assembly to a pneumatically driven plug [, possibly of identical composition,] which strikes a sensor.
That thread snapped. I am now interested in confirming the composition of this latter connection, and looking to see if adhesive was used, and whether any further potential for corrosion existed. As stated above, this machine was installed new last July.
OK, thanks for any and all input. Looking into whether and what preventive maintenance may have introduced contaminants to the reservoir.
Have a good morning.
RE: Name that corrosion!
RE: Name that corrosion!
http://www.corrosionclinic.com/types_of_corrosion/...
RE: Name that corrosion!
I would hope that replacing these every 6 months was in the preventative maintenance schedule, will check.
Thanks again.
RE: Name that corrosion!
RE: Name that corrosion!
And thanks is expressed well with purple stars ;)
RE: Name that corrosion!
"If you don't have time to do the job right the first time, when are you going to find time to repair it?"
RE: Name that corrosion!
I don't believe the assembly was coated in anyway. One person familiar with the equipment's history did mention a slimy film had been discovered on the interior, so, yea, it figures.
If any clear resolution comes of this, I'll update the thread. Have a fine weekend folks.
RE: Name that corrosion!
RE: Name that corrosion!