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topic 56325

Removing carbon layer from mild steel by alkaline cleaning method

December 14, 2010

sir please help me to remove a hard black carbon layer from ms- plate by using any alkaline based treatment

Hemant Sharma
owner of company - Faridabad, Haryana, India

January 21, 2011

Dear Mr. Sharma,

You can try the following step:
1. Hot Degreasing
2. Anodic Cleaner (I)-High Alkaline
3. Acid Pickling - HCl 40% v/v + inhibitor or and accelerator
4. Anodic Cleaner (II) - High Alkaline
5. Acid Dip
6. Next treatment.

We tested and got good result.

Try and you can see the result.

Good luck.

Best regards,
Tony Chandra

Tony Chandra
- Jakarta, Indonesia

January 22, 2011

A high pressure water jet can be very effective. Don't try it on small parts - it will throw them all over the shop.

geoff smith
Geoff Smith

February 17, 2011

Dear sir
first what kind of metal finishing you will make in the surface of this carbon steel ?
if you will make any kind of electroplating you must work in the following sequence
1- hot soak chemical degreaser
2- cold rinsing
3- hot cathodic degreaser
4- rinsing
HCl 40% by volume at room temperature
5- rinsing
6- hot anodic degreaser
7- cold rinsing
7- complete the sequence of electroplating
if you will painting it you must make the following sequence
1- hot soak or spray pre-chemical degreaser
2- hot soak or spray chemical degreaser
3- hot (50- 65 C ) sulfuric acid 8 - 10 %
4- cold rinsing
5- cold rinsing
6- alkaline passivation
7 hot dryer
best regards

ali gomaa farid
metal finishing expert - Egypt

March 19, 2011

Lots of ways and options. Put a picture of the part on to enable select the right one for you.

Khozem Vahaanwala
Khozem Vahaanwala
Saify Ind supporting advertiser
Bangalore, Karnataka, India

saify logo

March 23, 2011

In addition to one of the pre-treatment sequences already mentioned, the use of an ultrasonic transducer in the first rinse after the sequence should help to remove any residue that is still on the steel.

Lyle Kirman
consultant - Cleveland, Ohio

March 29, 2011

The advises given are good. Just one final comment. Are you sure it is carbon? It could very well be iron oxide.
G. Marrufo

Guillermo Marrufo
Monterrey, NL, Mexico

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