Sep 30, 2011 heatbaths explanation of operating parameters for salt spray cabinet according to astm b117. The salt spray test can give similarly misleading results when comparing different variants of zinc coatings. Sometimes referred to as salt fog, a salt spray test is conducted in a closed chamber that can be adjusted to create a variety of corrosive environments. A salt spray test is a corrosion testing method that uses highsaline environments to measure the corrosion resistance of products, paints and coatings over extended periods. With visual inspection following this test the suitability of. There are two variants of the method where test method a simulates a moderately aggressive traffic environment, while test method b simulates a. The test method was developed by sp technical research institute of sweden sp and the swedish car and electronic industries to examine accelerated corrosion of electronic units. Several studies have come to the conclusion that astm b117 does not provide a good test for coated aluminum alloys, or fails to predict the composition effects of aluminumzinc alloy coatings on coldrolled steel, or any other coatings. Salt spray was first used for corrosion testing around 1914. Pdf the salt spray corrosion of polymer coating on steel. Neutral salt spray test nss test or acetic acid with copper chloride cass test. The copperaccelerated acetic acid salt spray test is the test method in which a 5 % sodium chloride solution with the addition of copper chloride and glacial acetic acid in the ph range from 3,1 to 3,3 is atomized under a controlled environment. The continuous salt spray test is particularly useful for detecting.
A military testing standard for equipment specifying a cyclic salt mistfog test consisting of alternating salt mistfog exposures and drying exposures. In 1939, the neutral salt spray test was incorporated as astm b117. Our astm b117 salt spray test, also known as salt fog test, is performed according to stringent procedures. Salt fog is also known as the fog test or salt spray test. Samples under test are inserted into a temperaturecontrolled chamber where a saltcontaining solution is sprayed, at 35c, as a very fine fog mist over the samples. For the test, panels are placed in a 5% salt spray and fog atmosphere for measured periods of time.
Both industries are represented by trade associations which promote the use of their respective products. 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. Knowledge of salt spray test, the use of salt mist spray testing. Standard practice for operating salt spray fog apparatus1. It can happen in any form and cause a range of material alteration from mechanical damage through changes in physical properties to changes in physical appearance. Acculabs salt spray fog testing chambers provide exposure to a salt intensive atmosphere at temperatures of the customers choice to test the corrosion resistance of products in harsh. A large number of cyclic corrosion tests are made possible by combining salt spray environment with condensation humidity and air drying. Astm b117 90 standard test method of salt spray fog testing. Astm b117 testing operating salt spray fog apparatus study date. The salt spray or salt fog test is a standardized and popular corrosion test method, used to check corrosion resistance of materials and surface coatings.
This instruction manual is identified by document code on the cover to allow traceability. Corrosion resistance evaluation of decorative coatings, paint, powder coating, electroplated coppernickelchromium, electroplated coppernickel or anodized aluminium. Pdf accelerated corrosion testing for product qualification. Iso 9227 corrosion tests in artificial atmospheres salt spray tests keywords. The neutral salt spray test is the test method in which a 5 % sodium chloride solution in the ph range from 6,5 to 7,2 is atomized under a controlled environment. Salt spray fog testing is typically performed on electroplated, anodized, chemical coated or painted samples for marine, automotive and military equipment. For example, small additions of magnesium or aluminium to a zinc coating will produce salt spray test results that differ significantly from real exposure conditions. Validation of salt spray corrosion test springerlink. Corrosion analysis, salt fog, humidity laboratory testing inc.
The spray coating application cycle was repeated one, two or three times on different samples in order to achieve different thickness levels. The corrosion test in an artificial atmosphere of the salt spray mist needs evaluation of corrosivity of the test cabinet by reference specimens. The salt spray test is a standardized and popular corrosion test method, used to check corrosion resistance of materials and surface coatings. Pdf this study reports on the salt spray corrosion of polymer coating on steel. The software can control cycling test combining the following phases. This includes testing of a material in a controlled corrosive environment which has been used to produce relative corrosion resistance information for specimens of metals and coated metals. Salt spray corrosion testing china quality control.
The panels are tested in the salt spray test for 336 hours. This test is generally included in the lab testing protocol of any product which has exposed metal parts. Aug 19, 2018 in this test, specimens are put inside a chamber or cabinet for salt fog testing, with constant salt water spray or indirect fog, while the climate is maintained during the test. Astm b117 testing quality control micom laboratories. The test specimens shall be scribed with an x per astm d1654922000 standard test method for evaluation of painted.
E691 practice for conducting an interlaboratory study to determine the precision of a test method. A variety of corrosion analysis services, including the salt fog test to astm b117, corrosion analysis to astm a262 and a humidity test to ams 2700, are performed at laboratory testing inc. Im trying to understand the relation between the appearance of a failed salt spray test result and a problem related to the process contamination of seal solution, no good concentration of chromic acid solution. This corrosion test is intended to provide corrosion resistance information on metals and coated metals. Its function is to heat the air during dry phase of prohesion cyclic test.
Hilti corrosion performance assessment and product qualification methods 14. Annex a4, so 2 salt spray test, cyclic annex a5, dilute electrolyte cyclic fog dry test prohesion assured testing services maintains multiple chambers for salt fog and salt spray exposure testing, ensuring quick turnaround and automated, consistent testing results. The new 2017 version has renamed severities 1 to 6 to test methods 1 6 while also adding methods 7 and 8. The test standard takes precedence over this method statement and this method may need to be. Even better, however is to combine salt spray exposure with humidity cycling between. Corrosion testing, salt spray test laboratory testing inc. Such calibration of corrosion environment raises very strict requirements for the method.
Salt spray corrosion testing was performed for up to 300 hours on the submitted sample per astm b11703 using a harshaw filtrol chamber model gssch22, sn 32315, which was calibrated prior to use. Although we are unable to give an actual life expectancy relative to the accelerated salt spray testing, we do feel it gives you a good relative test when compared to other competitive products. This practice covers the apparatus, procedure, and conditions required to create and maintain the salt spray fog test environment. The acetic acid salt spray aass test is the test method in which an acidified 5 % sodium chloride solution with the addition of glacial acetic acid is atomized under a controlled environment. Unfortunately there is no direct correlation between exposure hours in the chamber and real world conditions since corrosion is comprised of many factors, but salt spray testing is a good tool for evaluating corrosion resistance. The devices in which these assessments are conducted are known as salt spray rooms. Salt spray testing is a standardized test method used to assess the corrosion resistance of coated or otherwise surface treated samples. E70 test method for ph of aqueous solutions with the glass electrode. The salt spray measurements indicate that the epoxypolyester polymer blend. Salt spray testing salt spray test is a method that is used to examine the deterioration level of resistance of covered examples.
It is important to note that the standard does not prescribe the interpretation of the results. The samples were subjected to testing in a singleton salt spray cabinet using astm b117 test methods. What is the standard practice for operating salt spray fog apparatus. Salt spray testing is a relatively low cost method of ascertaining how corrosion resistant your metal parts are, examining the durability of a protective coating, or even preparing items for subsequent steps in the production process.
After the coating on the boards dried, the samples were placed in the salt fog chamber figure 2. The test was passed, but customer refused to accept the parts because they found 1 black spot on a sampled part. To understand why the salt spray test fails to reliably predict real corrosion performance, it is important to look at the test procedure. Information sheet salt spray testing why it should not. Standard practice for operating salt spray fog apparatus. The astm b 11795 testing procedure is the hvac industry standard method of testing the acceptability and longevity of a paint finish. Astm b11719 covers the apparatus, procedure, and guidelines to create and sustain the salt spray fog test environment. Prohesion compared to salt spray and outdoors cyclic methods of accelerated corrosion testing by n. The oldest and most wildly used method for laboratory accelerated corrosion testing is.
Accelerated corrosion testing of industrial maintenance paints. Test samples three steel flange samples overcoated with oxifree tm198 coating system were prepared by oxifree co. Apr 23, 2003 quality control of corrosion test results implies the validation of the corrosion test method and estimation of the uncertainty of corrosion rate measurement. D1654 test method for evaluation of painted or coated specimens subjected to corrosive environments. Test procedure and acceptance criteria prime painted. Corrosion testing services including salt spray test corrosion is a form of material degradation that happens when material interacts with its environment. Salt spray fog test the astm b117 test method relies on a controlled, corrosive environment to. Iso 9227 corrosion tests in artificial atmospheres salt. The maximum interval between ph measurements shall not exceed.
When the panels fail, we can have pits or dark discoloration with pits. Development of accelerated corrosion tests involving. Salt spray testing is used to check corrosion resistance of coatings and metallic materials. 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. The corrosion test was performed in salt solution, which consists of 5% nacl. Distilled water was used in the 5% salt solution preparation. Astm b117 practice for operating salt spray fog apparatus. Salt spray testing, also known as corrosion testing, is a lab testing method that is used to determine if metal parts of the product will rust andor corrode when exposed to water and inclement weather. There are several problems with astm b117 salt spray test when trying to rank the corrosion performance of automotive parts. The salt spray test is an accelerated corrosion test used to measure the comparative corrosion resistance of materials exposed to a salt spray or salt fog at high temperature. It has been revealed that the anticorrosive function of the scribed hdibased coating was mainly. Figure 1 qfog chamber for the corrosion resistance testing, astm b117 3. During the course of 80 years of use, there have been many modifications and refinements to b117. Astm b117 testing, also known as a standard practice for operating salt spray fog apparatus, is used to analyze relative corrosion for specimens of metals and coated metals exposed to various simulated climatic conditions in a controlled environment.
32 549 1435 207 1565 1096 587 1269 1560 368 265 1193 834 484 1028 1355 501 618 857 1438 70 1458 1084 345 77 853 918 902 815 1352 1027 106 796 1054