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ASTM B 808 Document Information:
Title
Standard Test Method for Monitoring of Atmospheric Corrosion Chambers by Quartz Crystal Microbalances
ASTM International
Publication Date:
May 1, 2005
Scope:
This test method monitors the reactivity of a gaseous test environment
in which metal surfaces (for
example, electrical contacts, assembled printed wiring boards, and so
forth) and other materials
subject to pollutant gas attack undergo accelerated atmospheric
corrosion testing. This test method
is applicable to adherent corrosion films whose total corrosion film
thickness ranges from a few
atomic monolayers to approximately a micrometre.
The test method provides a dynamic, continuous, in-situ, procedure for
monitoring the corrosion
rate in corrosion chambers; the uniformity of corrosion chambers; and
the corrosion rate on
different surfaces. Response time in the order of seconds is possible.
With the proper samples, the quartz crystal microbalance (QCM) test
method can also be used to
monitor the weight loss from a surface as a result of the desorption
of surface species (that is,
reduction of an oxide in a reducing atmosphere). (Alternative names
for QCM are quartz crystal
oscillator, piezoelectric crystal oscillator, or thin-film evaporation
monitor.)
This test method is not sufficient to specify the corrosion process
that may be occurring in a
chamber, since a variety of pollutant gases and environments may cause
similar weight gains.
This test method is generally not applicable to test environments in
which solid or liquid
particles are deposited on the surface of the quartz crystal.
This standard does not purport to address all of the safety concerns,
if any, associated with its
use. It is the responsibility of the user of this standard to become
familiar with all hazards
including those identified in the appropriate Material Safety Data
Sheet for this product/material
as provided by the manufacturer, to establish appropriate safety and
health practices, and
determine the applicability of regulatory limitations prior to use.
The values stated in SI units are to be regarded as the standard. The
values in parentheses are for
information only.
Keywords:
- corrosion monitor
- piezoelectric crystals, sensors, thin-film monitor
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