Subject: Corrosion Mechanisms and Control - Five On-line Technical Paper: InterCorr/96
From: "Russell D. Kane"
Date: Thu, 02 Jan 1997 21:08:34 -0600
InterCorr/96 presents five on-line condensed versions of papers
presented at the NACE CORROSION/96 Corrosion Conference in Denver,
Colorado, March 24-29, 1996. You can receive your complimentary
registration to InterCorr/96 at:
http://www.clihouston.com/intercorr/index.html
and proceed to the technical sessions.
These five papers were presented at the technical session entitled:
CO2 Corrosion: Mechanisms and Control. Over 25 papers in this session
covered a range of related topics including mechanisms, flow induced
effects, testing, and corrosion modelling. The session was sponsored by
NACE Task Group T-1-3 (CO2 Corrosion in Oil and Gas Production). The
paper titles are given below:
Session Chairman: Arne Dugstad, Institutt for Energiteknikk, Norway.
Session Vice Chairman: Derrick Ho-Chung Qui, Baker Performance
Chemicals, Alberta, Canada.
Paper No. 4: Role of Conductive Corrosion Products on the Protectiveness
of Corrosion Layers - Jean-Louis Crolet, Nicolas Thevenot and Srdjan
Nesic.
Paper No. 6: The Formation of Protective FeCO3 Corrosion Product Layers
in CO2 Corrosion - EJ. van Hunnik, B.F. M. Pots and E.L.J.A. Hendriksen
Paper No. 9: Fracture Mechanical Properties of CO2 Corrosion Product
Scales and Their Relation to Localized Corrosion - G. Schmitt, T. Gudde
and E. Strobel-Effertz
Paper No. 13: Effect of microstructure and Cr Content in Steel on CO2
Corrosion - Masakatsu Ueda and Aio Ikeda
Paper No. 19: Predictive Model for Sweet Corrosion in Horizontal
Multiphase Slug Flow - P. Jepson, S. Bhongale, and M. Gopal
Dr. R.D. Kane
--
CLI International, Inc.
The Materials & Corrosion Specialists
Houston, Texas USA
CLI's Service, Systems and Software provides
Quick Response, Results Oriented Solutions....
WORLDWIDE.
Subject: Re: Annealing Delrin?
From: oligimer@aol.com
Date: 3 Jan 1997 18:04:54 GMT
In article <5abniq$ne1@alexander.INS.CWRU.Edu>, vbv@giskard.cwru.edu
("Virgilio 'Dean' B. Velasco Jr.") writes:
> I need to anneal some small slabs of Delrin. Someone
>recommended baking them at 165 deg F for about 20-30 minutes.
>I'd like to know if I can safely do this in a household oven.
>Might any toxic gases or other substances be released? I'd
>hate to ruin the oven altogether. Also, how critical would
>the temperature be? Since it would be difficult to regulate
>the temperature precisely in a kitchen oven, I think this will
>be a significant concern.
>
>
165 F probably wont do a thing for annealing the Delrin samples. Per
DuPont, the correct methods, are as follows:
Air Annealing-
In an air circulating oven, the parts are heated to 160 +/- 3 deg C (320
+/-5 deg F) for 30 minutes, plus 5 minutes / 1mm of wall thickness. It is
important that parts be uniformly heated and the oven capable of
controlling the circulating air temperature to +/- 3C.
Oil Annealing-
Parts annealed in a recommended oil circulating bath at 160 +/- 3 deg C
will require 15-20 minutes to come up to temperature plus 5 min/1mm of
wall thickness. Again, uniform heating is important, and the parts should
be restrained from contact with each other or the walls of the bath. As
parts are flexible at elevated temperatures, they should be handled
carefully to prevent deforming and allowed to cool slowly in an
undisturbed manner. Stacking or piling should be delayed until parts are
cool to the touch.
Partial Annealing-
Partial annealing is sometimes adequate instead of full annealing
described above.Partial annealing is accomplished by raising the
temperature of the part 28 deg C (50 deg F) above the maximum use
temperature for a period of 1 hour.
As far as using a residential oven, I dont think there would be adequate
circulation or temperature control. If it did get away from you, you
could certainly expect the release of formaldehyde based gasses. Not the
most pleasurable way to spend an afternoon.
Hope this helps.
Alan Larsen
