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


-----

Etch solution for A1050

2005

I wish to etch A1050 (99.5% of aluminium) to reveal the microstructure. Can anyone recommend a suitable etching solution?
I have try 27 ml HNO3 + 24 ml HCI + 39 ml H2O. But not enough to see the grain.
I also try a stronger etch solution, but the aluminium have "burn".
Have you any idea of what to do?
Thanks
Alexis

SARDIN Alexis
Student - Batk, UK

---

2005

A good general micro etch for Aluminium alloys is Kellers Reagent. HF based, and nothing like as concentrated as mixed acids you have tried.
1% HF
1.5% HCl
2.5% HNO3
Remainder Water
There are others - try googling 'Flick's, Tucker's or Vilella's. They're all variations on a theme.
Regards

Martin Rich
Ship Repair - Plymouth, UK

---

Dear Gentalman,

The use of HCl is very damaging on aluminum. For better result you can use combination of HF and wetting agent.

Navin Maheshwari
Meta Kem - New Delhi
2005