dear all
we perfom passivation per astm a-967 on screws
made from 15-5.
when we test them for two hours in salt spray we get rust
could you advise please
thanks
hello
we have an alumimum casting (356)
that went through vacuum impregnation and then alodine
after that when wiping the cast with a white cloth we discovered black stains on the cloth.
any one have an idea why?
if we remove the alodine chemically and then coat it again will it harm the...
Hi All
our drawing specified hydrogen embrittlement relief for PH 15-5 H 925 after passivation process.
the processor forgot this stage.
someone told me that for ph 15-5 after passivation in nitric acid you dont have to perform hydrogen embrittlement relief .
is that true? and why?
Hi All
I have parts from PH 17-7 SS with TH1050 (RC~38-40), it was passivated after machining but the vendor forgot to perform
HYDROGEN EMBRITTLEMENT RELIEF TREATMENT
I know that this process is to be done within 4 hours after passivation.
are those parts trash?
what can we do?
hi,
can someone please advise the difference between matt and bright tin plating from:
1. corrosion point of view
2. soldering (still using little Pb)
it is applied on aluminum for soldering
WHAT IS PREFFERED?
thanks
hi,
can someone please advise the difference between matt and bright tin plating from:
1. corrosion point of view
2. soldering (still using little Pb)
it is applied on aluminum for soldering
thanks
HI ALL
I have some part that I have to repair with
1. Type I color No. 611 (LAC specification L-722D
2. aluminized finish per MIL-F-7179 Type III
Does any body knows these specs?
Hi all
Im looking for the thickness of the solgel conversion
coating treatment on titanium.
(I think its in a range of few micron-meter but I need more accurate data)
can somebody help me here
how long can I wait from application of alodine to application of mil-prf-23377.
I read somewhere that if more than 72 hours elapse I need to reprocess the part. can someone shed some light onthis issue
