Hydrogen Embrittlement _ bake times 6

[ipcrus]

Question: Is there a chart or book that tell the bake time &
temp to remove the hydroger from the perant material in the
cab,chrome,etc. plate (electro Plate) process.... How long to bake ? At what temp ? Thanks for your help.. ipcrus

Ps. sorry about the spelling... Went to school to eat my lunch

 

[lgearhart]

A document written specifically for that purpose is AMS 2759/9, available from the Society of Automotive Engineers. Their website is

http://www.sae.org,

and you can get some more information on the specification there.

Lee

 

[israelkk]

Do a search for QQ-P-416F at

http://assist.daps.dla.mil/quicksearch/

it is free. It has all the data you need.

 

[Flesh]

ASTM also has a standard for this:
ASTM B850-98(2004) "Standard Guide for Post-Coating Treatments of Steel for Reducing the Risk of Hydrogen Embrittlement".

 

[limct]

ipcrus,
Look out in this web page for the technical report regarding Hydrogen Embrittlement.

http://www.surtec.com/TechnicalLetters.html

It may be useful. Good Luck !

Best regards,
ct

 

[NickelMet]

I have a book entitled:

"Welding Steels without Hydrogen Cracking" by Bailey et.al. (published by Abington Publishing and distributed through ASM International).

It may give you some more insight.

~NiM

 

[grampi1]

See

http://www.ionscience.com/Pages/HydroConfPapers.htm

for a great tool. Note free NACE papers including;

C.N.Brown, M.J.Carroll, F.W.H.Dean, J.H.Harrison, A.Kettle, 'Applications of Hydrogen Flux Monitoring to Pre-Weld Bakeouts of Steel', Corrosion 2004, Paper 04477, NACE, New Orleans. Abstract: During a pre-weld bakeout, hydrogen efflux was monitored in real time using the hydrogen collection method at high temperatures. A circular section of a 50 mm thickness alkylation unit acid storage vessel dome which had developed severe hydrogen blistering was removed, and pre-weld bake-out applied using heat pads placed within twelve inches of the cut-away section perimeter, on the dome’s exterior face. A ring of eight hydrogen collection probes were placed under the heat pads, about six inches from the cut-away perimeter. One probe became blocked and failed to deliver measurement. The remaining seven delivered flux values indicating effective bake-out at five sites, and the need for extended bake-out at two neighboring sites. The efflux trend at these sites strongly indicated initially high concentrations of hydrogen liberated by the bake-out. Corresponding efflux measurements at corresponding positions on the dome’s interior face were much lower. A model of hydrogen diffusion for the bake-out, incorporating a high density of trapping sites located at depths of 5-15 mm beneath the monitored exterior face provided model flux transients consistent with field flux transients and spot measurements. The work demonstrated that pre-weld heat treatment can be assessed, extended or reduced in real time, on evidence provided by spot high temperature hydrogen efflux measurements at a small number of sites. An additional bake-out is presented in which near zero hydrogen effluxed.