REVISION HISTORY

Revision A: Dated – April 13, 1989

First Edition was called Revision A in error.

Revision B: Dated – June 20, 2001

Para 7.1.6 – Changed to read: Final rinse is made with D.I. Water.

Revision C: Dated – August 15, 2001

Approval Signature and Date added to front page.

Revision D: Dated – October 28, 2008

Revision History page added.

Para 6.1 – Changed to read: The component will be processed as instructed on the

   customers P.O., customer supplied drawing, tags, e-mail, Celco Quote

form or other customer communication.

Para 6.3 – Changed to read: After Electropolishing and examination of the first

Article(s), the time, voltage and fluid temperature will be recorded to be

   put on a Job History Sheet with other information.

Revision E: Dated – May 13, 2009

Para 7.1.1 – Change to read: Rinse components in the drag out rinse to remove EP fluid.

Para 7.1.2 – Change to read: Potable water rinse.

page – i –

 

 

1.0 SCOPE

1.1 This procedure will define the various steps involved in electropolishing components

for use in high purity applications.

2.0 MATERIAL

2.1 The material used in these components will be 300 series stainless alloy or of a

chromium/nickel alloy suitable for electropolishing.

2.2  The components will be in a prefinished state with the surface to be electropolished

having a surface roughness no more than twice the roughness of the desired finished

roughness.

2.3  All components will be assumed to be cleaned and absent of all scale, oil or surface film

upon receiving.

3.0 RECEIVING

3.1 All components received will be inspected for damaged during shipment immediately

after receipt of shipment.

3.2  All surfaces will be checked for visual damage to critical surfaces. If any protective

cover is separated from the component, the customer will be notified immediately.

3.3  All quantities will be verified to the quantity shown on the packing list. If discrepancies

are found, the customer will be notified immediately.

4.0 STORAGE OF INCOMING COMPONENTS

4.1 All components will be stored in their shipping containers until preparation for

electropolishing.

4.2  All components will be stored with a work order detailing the quantity, EP instructions

and customer purchase order.

5.0 RECEIVING INSPECTION

5.1 An inspection will be undertaken prior to electropolishing to verify the components

conform to the specifications and/or the instructions so noted on the customer P.O. or

provided drawings.

5.2  If a specific surface roughness is specified by the specification and/or instructions the

surface may be checked with a profilometer as required to verify that the initial surface

is suitable for the instructed surface to be obtained.

6.0 ELECTROPOLISHING

6.1 The component will be processed as instructed on the customers P.O., customer

supplied drawing, tags, e-mail, Celco Quote form or other customer communication.

6.2  Electrolytes used in the process are evaluated bi-weekly for specific gravity and

temperature and are adjusted accordingly.

page – 1 –

 

 

6.3  After Electropolishing and examination of first article(s), the time, voltage and fluid

temperature will be recorded to be put on a Job History Sheet with other information.

7.0 RINSING

7.1 Following the electropolishing of the component the following rinsing procedure is

performed.

7.1.1 Rinse components in the drag out rinse to remove EP fluid.

7.1.2 Potable water rinse.

7.1.3 Rinse in pigging bath.

7.1.4 Rinse in first stage water rinse.

7.1.5 Rinse in second stage water rinse. The components can be stored in this tank until

final rinse.

7.1.6 Final rinse is made with D.I. water.

8.0 INSPECTION

8.1 The components are place in a clean air area to dry, dried with compressed air or dried

utilizing heated air or lint free cloths.

8.2  The components are 100% visually inspected for consistency and uniformity of

electropolishing.

8.3  If required, the micro inch roughness is measured by a profilometer to assure the

required surface.

8.4 All rejects are either rerun or recorded for separate packaging.

9.0 PACKAGING

9.1 Normal packaging of components are placed in plastic bags and heat sealed to assure

maximum cleanliness.

9.2  Large components which are not placed in plastic bags are wrapped in appropriate

material to assure maximum cleanliness.

9.3  The components are counted for final packaging and placed in the original shipping

container or appropriate container for final shipment.

10.0 SHIPPING

10.1 All shipments are shipped by most efficient means.

page – 2 –