Salt Spray Chamber Manufacturers
Salt Spray Chamber Manufacturers
We are best Salt Spray Chamber Manufacturers in India, Salt Spray Test Chamber as per requirement of ASTM b117 and JIS 2371 standards. capacity 108 Liter to 654 Liter
Salt Spray Chamber Manufacturers
Salt Spray Chamber Manufacturers
Standards :
Salt Spray Chambers
a) 1. ASTM b117
b) 2. JIS 2371
c) 3. ISO 9227 standards
Methods
The following methods are most popular. Which are widly used in salt spray test equipments
a) a) ASTM B117 Neutral salt spray (NSS)
b) b) ASTM G85 Acetic acid salt spray (ASS)
c) c) ASTM B 368 : Copper-accelerated acetic acid salt spray (CASS)
Natural Salt Spray Test (NSS)
In Salt Spray Corrosion Testing 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.
Best 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.
Copper Accelerated Salt Spray Test (CASS Test)
As per corrosion pedia CASS test is carried out by using 95 parts of water to 5 parts by weight of salt to make a standard ASTM B 117 solution. A reagent of grade copper chloride is then added, which dehydrates at the rate of 1g to 4 liters of the solution. This solution is then atomized after mixing, and the cabinet is maintained at 490C (1200F). The fog is then collected, tested and the solution adjusted to a pH between 3.1 and 3.3. This is achieved by adding the reagent-grade glacial acetic acid CH3COOH.
All Samples have multilayered, plated or coated edges that are coated to prevent edge corrosion. When this test cabinet is ready, the metallic and the metallic-coated samples are cleaned using an appropriate cleaning solution. The organic and non-metallic samples are not cleaned. The samples are placed at a 15-degree angle from the vertical position. Components used for automobile or aerospace are placed in an "as used" position. During testing, the samples can be rotated 180 degrees. When testing is conducted, the required time is 24 hours, but time may be added. The ideal option is to evaluate the samples at any interval and then return the samples to the cabinet.
Hence This method prescribes the required conditions in copper-accelerated acetic acid-salt spray (CASS) testing for the purposes of specification. The test also is applicable for the testing of anodized aluminum. It evaluates the corrosive performance of copper, nickel or chromium
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