Pdf the salt spray corrosion of polymer coating on steel. A discussion started in 2005 but continuing through 2020. The astm b 11795 testing procedure is the hvac industry standard method of testing the acceptability and longevity of a paint finish. May 24, 2014 salt spray chamber corrosion test chamber korroxiii testing procedure presto group duration. Figure 3typical scale on the megger insulation tester. Salt spray fog condensate collection issues, astm b117. Oct 23, 2016 salt spray test iso 9227 din 50021 astm b 117 astm b 287 astm 368 astm d 1735 mil std 202d mil std 810 c iso 1456.
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. The devices in which these assessments are conducted are known as salt spray rooms. 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. Both industries are represented by trade associations which promote the use of their respective products. 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. Salt spray fog testing is typically performed on electroplated, anodized, chemical coated or painted samples for marine, automotive and military equipment. 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. Typically, the solution is a 5%salt sodium chloride solution. Such calibration of corrosion environment raises very strict requirements. Corrosion resistance evaluation of decorative coatings, paint, powder coating, electroplated coppernickelchromium, electroplated coppernickel or. Suitable apparatus which may be used is described in appendix x1. They were removed at regular intervals, rinsed and cleaned with a soft brush. Quality control of corrosion test results implies the validation of the corrosion test method and estimation of the uncertainty of corrosion rate measurement.
For the test, panels are placed in a 5% salt spray and fog atmosphere for. The test chamber maintains an internal temperature of approximately 95f, and produces a saturated, 100% rh environment using a 5% salt solution to produce the fog. The corrosion test was performed in salt solution, which consists of 5% nacl. 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. To simulate corrosive effects the equipment is exposed to salt mist. Astm b117 90 standard test method of salt spray fog. Validation of salt spray corrosion test springerlink.
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. 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. Salt spray test is a method that is used to examine the deterioration level of resistance of covered examples. Salt spray testing salt spray test is a method that is used to examine the deterioration level of resistance of covered examples. The test consisted of combining the exposure to uv radiation and. The salt spray measurements indicate that the epoxypolyester polymer blend.
Pdf modification of astm b117 salt spray corrosion test. In our test laboratories, we perform salt mist testing salt spray testing according to international standards as. Therefore, the test results and the predicted lifespan of a material may not be completely accurate, and so the design and construction of the salt spray test chambers needs to be carefully considered. Sep 30, 2011 salt spray chamber corrosion test chamber korroxiii testing procedure presto group duration. 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. Information sheet salt spray testing why it should not. Dec 21, 2016 normally this test is done for four days and so its a 24hour spray of a 5% salt solution and the temperature is generally kept around 35 degrees. Corrosion resistance evaluation of decorative coatings, paint, powder coating, electroplated coppernickelchromium, electroplated coppernickel or anodized aluminium. Such calibration of corrosion environment raises very strict requirements for the method. Reverse side of card at right is used to record the test data.
If not, fill up the tank with the required brine concentration, typically 5% wt. E691 practice for conducting an interlaboratory study to determine the precision of a test method. The corrosion test in an artificial atmosphere of the salt spray mist needs evaluation of corrosivity of the test cabinet by reference specimens. Development of accelerated corrosion tests involving. 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 samples were subjected to testing in a singleton salt spray cabinet using astm b117 test methods. Salt spray chamber corrosion test chamber korroxiii testing procedure presto group duration. With visual inspection following this test the suitability of. 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. This test is not intended to be used for sample or coupon testing in lieu of assemblage testing. What is the standard practice for operating salt spray fog apparatus. The lesser incline will produce a situation where beads of condensate will run off the specimen at a faster rate than a specimen at say 30 degrees,where the bead has a chance to sit. With the test item in the chamber, adjust the test chamber temperature to 35c, and condition the test item for at least two hours before introducing the salt fog. Astm b11719 covers the apparatus, procedure, and guidelines to create and sustain the salt spray fog test environment.
Evaluation of protective coatings for highcorrosivity. This test astm b117 was first used for cor rosion testing around. In 1939, the neutral salt spray test was incorporated as astm b117. 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. Ppt salt spray testing powerpoint presentation free to. After the coating on the boards dried, the samples were placed in the salt fog chamber figure 2. And then after 24 hours the unit is taken out and allowed to dry for 24 hours. Figure 4typical record of insulation resistance of a mill motor.
Five steel plates have been placed in a salt spray cabinet during 4,000 hours. Specifically, the discussion will concentrate on the salt spray or salt fog test. This device prevent direct impact of spray on the test specimens, and it is helpful in obtaining uniform distribution of the spray. Test samples three steel flange samples overcoated with oxifree tm198 coating system were prepared by oxifree co. Astm b117 90 standard test method of salt spray fog testing. The salt spray test procedure basically, the salt spray test procedure involves the spraying of a salt solution onto the samples being tested. The test results are to be considered as an aid in the selection of suitable paint systems and not as exact information for determining durability. 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. Astm b117 testing quality control micom laboratories.
The spray coating application cycle was repeated one, two or three times on different samples in order to achieve different thickness levels. To understand why the salt spray test fails to reliably predict real corrosion performance, it is important to look at the test procedure. Salt spray was first used for corrosion testing around 1914. Accelerated corrosion testing the purpose of an accelerated corrosion test, such as the salt spray test, is to duplicate. A military testing standard for equipment specifying a cyclic salt mistfog test consisting of alternating salt mistfog exposures and drying exposures. E70 test method for ph of aqueous solutions with the glass electrode.
D1654 test method for evaluation of painted or coated specimens subjected to corrosive environments. This environment is maintained throughout the duration of the test. The salt spray tests were performed in our uk facility in a qfog model ssp600 chamber. Salt spray fog test the astm b117 test method relies on. Coupons of aluminum, aluzn, carbon steel, copper and zinc are exposed, both at sp and at saab. 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. This corrosion test is intended to provide corrosion resistance information on metals and coated metals. Conditions a procedure is given for evaluating the corrosive conditions within a salt spray cabinet1. The procedures used to develop this document and those intended for its. This is done inside a temperaturecontrolled chamber. Astm b117 outlines the standard practice for operating the salt spray chamber.
Unfortunately, despite these warnings, salt spray testing is still used in communications to introduce new coatings and materials to the market. Since corrosion is a very complicated process and since it can be influenced by many external factors, there is, however, only limited correlation between the exposure duration and the expected life of a coating surface. And was based on method 1iec6829 procedure b test method. D609 practice for preparation of coldrolled steel panels for testing paint, varnish, conversion. Figure 1 qfog chamber for the corrosion resistance testing, astm b117 3. This document specifies two accelerated corrosiontest procedures, methods a. During the course of 80 years of use, there have been many modifications and refinements to b117. Salt spray testing is used to check corrosion resistance of coatings and metallic materials. And then it goes back in the chamber and is subjected to the 5% salt spray, or salt fog, for another 24. Corrosion testing services including salt spray test corrosion is a form of material degradation that happens when material interacts with its environment. Hotdip galvanized surfaces are not generally tested in salt spray test see iso 1461 or iso 10684. 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. Salt fog is also known as the fog test or salt spray test. Astm b117 practice for operating salt spray fog apparatus.
Observations were made at the following exposure steps. Industry standards in terms of size, test duration and procedure need to be understood and met before undergoing testing. 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 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. It is important to note that the standard does not prescribe the interpretation of the results. The two tests involve cyclic exposure of the specimens to acidified salt spray. These by products are not produced when a hotdip galvanized specimen is exposed to a salt spray fog. Standard practice for operating salt spray fog apparatus. Orient and help to obtain uniform distribution of salt fog. The nature of the salt spray test is to subject the specimen to salt fog as a condensate. Salt spray chamber operating procedures operating the equipment. Referenced documents purchase separately the documents listed below are referenced within the subject standard but are not provided as part of the standard astm standards. Annex e recommended specimen geometries salt spray tests to metal and. Corrosion aging tests in a neutral salt spray chamber were. Isodis 9227en, corrosion tests in artificial atmospheres.
In the salt spray test, samples are placed in an enclosed salt spray testing cabinet or chamber built to astm b117 specifications and subjected to uninterrupted indirect fog or spray of a salt water solution. Both terms, spray and fog, are used to describe the same test procedure, and are used interchangeably when describing and discussing this test. Salt spray testing is popular because the test is inexpensive, quick, standardized and repeatable. The complete guide to electrical insulation testing. Why salt spray testing gives misleading results to understand why the salt spray test fails to reliably predict real corrosion performance, it is important to look at the test procedure. Distilled water was used in the 5% salt solution preparation. This part of iso 12944 covers protective paint systems designed for application to uncoated steel, hotdipgalvanized steel and steel surfaces with thermally sprayed zinc coatings.
Furthermore astm b117 document states the procedure involves the exposure of steel test panels and the determination of their mass losses in a specified period of time. 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. 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. 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. The continuous salt spray test is particularly useful for detecting. The software can control cycling test combining the following phases.
Neutral salt spray test nss test or acetic acid with copper chloride cass test. The copperaccelerated acetic acid salt spray test cass is the test method in which an acidified 5 % sodium chloride solution with the addition of copper chloride and glacial acetic acid is atomized under a controlled environment. Iso 9227 corrosion tests in artificial atmospheres salt spray tests iec. A free powerpoint ppt presentation displayed as a flash slide show on id. Corrosion analysis, salt fog, humidity laboratory testing inc.
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. Standard practice for operating salt spray fog apparatus1. For the test, panels are placed in a 5% salt spray and fog atmosphere for measured periods of time. The last modification c is a combination between modification a and b i. Salt spray testing is also a standard in the automotive industry for components. The samples being tested are inserted into the chamber and then the saltcontaining. Pdf this study reports on the salt spray corrosion of polymer coating on steel. Open up the rine inlet and ensure is filled at least to the set mark the black line. Hotdip galvanizing produces zinc carbonates when exposed to the environment, thus protecting the coating metal and reduce the corrosion rate.