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Hard anodise problems

2005

* WE ARE DOING HARD ANODIZED ON aluminium HE-30 MATERIAL. THE PARAMETERS ARE AS BELOWS
(1) HARDNESS-UP TO 500 VPN

(2) COATING THICKNESS 50 TO 60 MICRON

WE ARE FACING PROBLEM COATING GETTING PILLED OFF AFTER SOME USE please LET'S KNOW THE REASONS? HOW TO AVOID IT.?

* WE HAVE ALSO NOTICED SHADE VARIATION IN FINISH OF PRODUCT i.e. BLACK AND GRAY COLOUR IN SAME PROCESS Please. LET'S KNOW THE REASONS FOR THIS.?

ALAM SAIYED
HIMSON TEXTILE - SURAT , GUJARAT, INDIA

2005

Dear sir,

What is the temperature of the anodize bath?
Do you have agitation in the anodize bath and if you have does it work properly?
What is the Al-ion concentration in the bath?
Which anodise process do you use H2SO4 or P3SO4?

Do you add any chemicals to the anodize bath which eliminate anodize mistakes?

Most likely the cooling of the workpiece is not enough and the soft film is coming from severe chemical attack

Best regards,

Marcel Uivel
- Chiang Mai, Thailand

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