Cast Iron in a citric acid environment

• Jul 15, 2003

• #2

negotiator

Electrical

Nov 8, 2002

14

They will get their zinc for the day (week). I use stainless (medical grade), so the obvious repurcussions do
not occur (chemical-leeching OR legal).
thestocksguy@hotmail.com

 

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• Jul 15, 2003

• Thread starter
• #3

jasonreber

Mechanical

Jul 10, 2003

6

This pump is being placed in wastewater. No need to worry about contamination. Would contamination be slowed if the pump is continually submersed (no exposure to air)? Are the anodes going to dissolve rapidly (how fast compared to seawater)?

Thanks for any help you can provide.

 

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• Jul 15, 2003

• Thread starter
• #4

jasonreber

Mechanical

Jul 10, 2003

6

In the above message I meant to ask if corrosion would be slowed (not contamination).

Sorry for the mistake.

 

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• Aug 7, 2003

• #5

pik199

Materials

Aug 1, 2003

3

Hi,

Your corrosion will be slow down.
Your wastewater will be contaminated by zinc, and you need clean it.
What do you need more?

Aleksandr

 

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• Aug 7, 2003

• #6

JimMetalsCeramics

Materials

Jul 8, 2003

295

What is the pH of the wastewater?

 

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• Aug 7, 2003

• Thread starter
• #7

jasonreber

Mechanical

Jul 10, 2003

6

I am estimating a minimum of 4.5, this water is only washing off the pineapples

 

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• Aug 7, 2003

• #8

JimMetalsCeramics

Materials

Jul 8, 2003

295

I would not expect the cast iron to appreciably etch at that pH. You can use sacrificial coatings (e. g., Zn) but they might only slowly etch preferentially.

 

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• Aug 11, 2003

• #9

Charh

Materials

Aug 11, 2003

1

We have had really good luck with using a high chome white iron ASTM A 532. It has good corrosion resistance and wears much longer than the regular ductile or grey iron.
Let me know if you need any additional info.

 

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• Sep 8, 2003

• #10

rmasline

Chemical

Aug 27, 2003

3

Just out of curiosity, why don't you consider using a different media for your pump? There are many economical choices for pumps that could probably suit your needs and would be resistant to the specific corrosion problem you are trying to combat.

Does the pump have to be submerged or totally surrounded by the fluid? By using a non-submerged pump you could control what parts where wetted and insure that the seals and gaskets (contact points) were non-reactive with your solution.

Just my two cents.. good luck with your project!

 

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