No cost, no registration, no passwords -- just aloha, fun & authoritative answers
(as an eBay Partner & Amazon Affiliate we earn from qualifying purchases)

Where the
world gathers for metal finishing
Q&As since 1989

-----

Surface Finish after Manganese Phosphating

2007

Dear sir
We are doing manganese Phosphating on our shaft after centerless grinding in which surface Finish comes 0.4 Ra but after phosphating uniformity is not proper & surface finish comes 0.8 - 1.1 Ra as against our spec. 0.8 Ra max.
Please help. material of our shaft is 20 MnCr5

Rajiv Gupta
Dy. manager Qa - Ghaziabad, India

I think it's the spec that needs corrective action rather than the phosphating process, Rajiv. One of the purposes of phosphatizing is to offer "tooth" for paint adhesion and oil retention. It sounds a bit like one of the specifications for your phosphatizing process it that it must not work :-)

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2007

(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories: