What is ASTM b117 salt spray test?
What is ASTM b117 salt spray test?
Salt spray testing is a common accelerated corrosion test method that exposed metallic and non-metallic materials to a highly corrosive environment, over an extended period of time, in order to assess their relative corrosion resistance.
Why salt spray test is required?
Salt spray testing is a method of checking the corrosion resistance of coatings and materials used to manufacture products such as fasteners. During salt spray testing, an accelerated corrosive attack is produced in order to better predict how well the coating protects the metal.
What is white rust in salt spray test?
White rust is nothing but failure phenomena of coated surface and Red rust is failure phenomena of parent material. White rust and Red rust can be decided by the nature of coating. Generally salt spray specification for white rust will be 46 hrs and red rust will be 120 hrs, of course depends on nature of coating.
Which material is used for salt spray testing?
Usually, the materials to be tested are metallic (although stone, ceramics, and polymers may also be tested) and finished with a surface coating which is intended to provide a degree of corrosion protection to the underlying metal.
What is is standard for salt spray test?
ASTM B117 salt fog or salt spray testing is a very popular corrosion test designed to provide corrosion resistance information on metals and coated metals. The ASTM B117 test standard has also been approved for use by Department of Defense agencies.
What are salt spray hours equivalent to in years?
I don’t want to bore you with more test methods, but as you can see there are reasons for tests other than salt spray. My references indicate that approximately 100 hours salt spray is similar to one year outdoors based on OEM testing in the US.
What is SST in powder coating?
Salt Spray Test (SST) is a really widespread corrosion method, applied in order to check materials and surface coatings corrosion resistance.
What do you mean by ISO 4 rating in spray test?
Standard spray rating as follows(The bigger number is, the better spray resistance effect is). AATCC 100 (ISO 5 Grade): Sample surface without drop of water or wet situation. AATCC 90 (ISO 4 Grade): A little wet at the spray point on surface of sample.
What is difference between white rust and red rust?
Red rust, which is the formation of ferrous oxide, is noted by its distinctive reddish-brown color. White rust is zinc oxide that takes the form of a white powder that becomes waxy when wet. Red rust is the more destructive of the two, and it’s the type that will actually eat through the metal.
What causes black spots on zinc plating?
Black marks in barrel plating of acidic zinc are a results of too high divalent iron in the solution. You have to oxidise the iron (by hydrogen peroxide or air) and filter the sludge.
How does salt spray test hours correlated to real life?
It should be noted that contrary to what many people think or expect, the Salt Spray Test, just like other corrosion tests does not correlate anything. The test for X hours is not an indicator of any number of years that coating will resist corrosion. This is because, in real life situations, rust takes years to occur.
What is Ruspert coating?
Ruspert® A high-grade metal surface processing technology that prevents corrosion. The coating system consists of three layers: a metallic zinc layer, a high-grade anti-corrosion chemical conversion film, and a baked ceramic surface coating. WAR® A high-grade metal surface processing technology that prevents corrosion.