Salt-Spray-test-chamber-Manufacturers-India-Delhi
Salt Spray Chamber
Salt Spray Chamber
Natural Salt Spray Test (NSS)
In Corrosion
there is nothing so that simply happens. It starts
from a combination of factors that are naturally occurring, such as moisture
ie Humidity, temperature of Chamber, and acidity ie. pH Value of Saline Solution. Because of this, for a salt spray corrosion test to be truly
accurate, it requires a high level of precision in terms of introducing the
variety of elements and aspects that contribute to oxidation.
An example
is the salt spray test chamber itself. The unit
must be built to ASTM B117 specifications, which is a standard established by
the American Society for Testing and Materials. A chamber that meets the ASTM B117 salt spray test standard. It means having the dimensions necessary to reflect the corrosion
resistance of a given speciman.
The
temperature setting is another variable that must be very specific. ASTM B117 requires a warmth level of 95 degrees Fahrenheit
and that this temperature be maintained for the duration of the salt fog test. This is an additional reason why the chamber must be
compliant with ASTM specifications; it ensures that the temperature will remain
the same for the duration of the evaluation.
A salt spray
apparatus, powered by pressurized air is used to apply the mist evenly, which
must have a sodium chloride concentration level of 5% and a pH range between 6.5 and 7.2. This range is designed to reflect the acidity of water that
is found in outdoor environments, such as the ocean. Salt spray tests are fully customizable so the pH can be
lowered. For example, regular rainfall has a
pH value of between 5.0 and 5.5, according to the Environmental Protection Agency.
The one
variable that is entirely up for the experimenter to decide is the length of
the test itself. Generally speaking, the test can be
days, weeks or years, whatever duration the test subject will be exposed to the
elements. The longer it goes, the more
extensive the corrosion tends to be.
Acitic Salt Spray Test
In this
method we use the 1% Acetic Acid with 5% saline solution with other accelerated methods for evaluating
the corrosion resistance of anodized aluminum and chromium-nickel-copper
systems on steel, zinc and copper basis materials.
Hence specimens
to be tested by the three accelerated test methods and by outside exposure,
including a wide range of anodic film thickness on high purity aluminum and
super purity aluminum (99·99%) together with a wide thickness range of
chromium—nickel—copper deposits upon steel, brass, and zinc based materials.
Therefore It
is concluded that the 24 hour SO2 test is the most suitable for rapid
assessment of chromium-nickel and chromium—nickel—copper
deposits on steel, but that the hot or cold acetic acid tests are the most
useful for evaluation of similar coatings on zinc base alloy or brass. In the case of anodized high purity and super purity
aluminum, it is shown that a definite relationship exists between anodic film
thickness and rate of breakdown, using the hot acetic acid method, but that the
other accelerated methods are not very satisfactory.
Hence it is
clear that the straight 5% salt
spray is not suitable as an accelerated test for chromium—nickel—copper systems
on any of the basis metals tested or for anodized aluminum, in that virtually
no correlation between the rate and type of breakdown found when using the test
and that which occurs under atmospheric analysis.
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