Coal tar epoxy coating VS skotchkote 134 for protection against corrosion resistance

Question

Coal tar epoxy coating VS skotchkote 134 for protection against corrosion resistance

Mech5656 (Mechanical)

(OP)

11 Nov 22 23:40

Hello All,

We have vertical turbine water pump that has cast iron parts and we are thinking to coat them. We have two options. Can you recommend, based on your past expereince, which one can provide more reliable long term resistance against corrosion. Coal tar epoxy coating or skotchkote 134?

TugboatEng (Marine/Ocean) · Answer 1 · 2022-11-12 01:12:50

I don't think you want the hassle of a thermoset epoxy. That would rule out the Scotchkote 134. What led you to single out these two products? What characteristics do they have ths you desire.

There are companies that specialize in these types of coatings. I would consult one of them.

International 300V would be my alternative suggestion without any additional details. It holds up well in fast moving water around boat hulls. This is assuming you're not experiencing erosion or cavitation.

dik (Structural) · Answer 2 · 2022-11-12 04:26:23

Many coal tar epoxies are carcinogenic. Just a heads up.

https://www.sciencedirect.com/topics/materials-sci...

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So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

TugboatEng (Marine/Ocean) · Answer 3 · 2022-11-12 04:37:51

RE: Coal tar epoxy coating VS skotchkote 134 for protection against corrosion resistance

TugboatEng (Marine/Ocean) 12 Nov 22 04:37

Most industrial coatings are. Take proper precautions.

dik (Structural) · Answer 4 · 2022-11-12 05:10:49

again, a heads up.

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

EdStainless (Materials) · Answer 5 · 2022-11-12 22:34:17

There are likely 50 different coatings that would work fine.
Getting the correct surface preparation and application is 99% of your issue.
I would look at something other than epoxies, such as urethanes.

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TugboatEng (Marine/Ocean) · Answer 6 · 2022-11-13 00:03:21

Good luck sourcing urethanes with the current supply chain issues.

EdStainless (Materials) · Answer 7 · 2022-11-13 00:56:00

These days that advice should be to find out what your local suppliers have available.
I have heard of cases where one coating is available in Houston but not in Chicago.
Seems very common these days.

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P.E. Metallurgy, consulting work welcomed

TugboatEng (Marine/Ocean) · Answer 8 · 2022-11-13 01:00:15

I'm having a hard time sourcing polyurea greases and that's a problem because they don't always play well with other types.

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Coal tar epoxy coating VS skotchkote 134 for protection against corrosion resistance