A discussion started in 2005 but continuing through 2020. Such calibration of corrosion environment raises very strict requirements for the method. The corrosion test was performed in salt solution, which consists of 5% nacl. The corrosion test in an artificial atmosphere of the salt spray mist needs evaluation of corrosivity of the test cabinet by reference specimens. And was based on method 1iec6829 procedure b test method. Hotdip galvanizing produces zinc carbonates when exposed to the environment, thus protecting the coating metal and reduce the corrosion rate. A free powerpoint ppt presentation displayed as a flash slide show on id. 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.
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. Orient and help to obtain uniform distribution of salt fog. Pdf modification of astm b117 salt spray corrosion test. This test is not intended to be used for sample or coupon testing in lieu of assemblage testing. Evaluation of protective coatings for highcorrosivity. This document specifies two accelerated corrosiontest procedures, methods a. Curve b shows same values corrected to 20c see page 22, giving a definite downward trend toward an unsafe condition. Pdf this study reports on the salt spray corrosion of polymer coating on steel. Typically, the solution is a 5%salt sodium chloride solution. Distilled water was used in the 5% salt solution preparation. The samples being tested are inserted into the chamber and then the saltcontaining. It is important to note that the standard does not prescribe the interpretation of the results.
Validation of salt spray corrosion test springerlink. 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. They were removed at regular intervals, rinsed and cleaned with a soft brush. Figure 3typical scale on the megger insulation tester. Standard practice for operating salt spray fog apparatus1. In our test laboratories, we perform salt mist testing salt spray testing according to international standards as. Accelerated corrosion testing of industrial maintenance paints. This instruction manual is identified by document code on the cover to allow traceability.
Accelerated corrosion testing the purpose of an accelerated corrosion test, such as the salt spray test, is to duplicate. Salt spray testing is used to check corrosion resistance of coatings and metallic materials. 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. Reverse side of card at right is used to record the test data. 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. 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 testing is popular because the test is inexpensive, quick, standardized and repeatable. 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. 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. The software can control cycling test combining the following phases. This environment is maintained throughout the duration of the test.
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. Conditions a procedure is given for evaluating the corrosive conditions within a salt spray cabinet1. Salt spray chamber corrosion test chamber korroxiii testing procedure presto group duration. Corrosion analysis, salt fog, humidity laboratory testing inc. Five steel plates have been placed in a salt spray cabinet during 4,000 hours. 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. 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. Astm b117 testing quality control micom laboratories.
Test samples three steel flange samples overcoated with oxifree tm198 coating system were prepared by oxifree co. The two tests involve cyclic exposure of the specimens to acidified salt spray. 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. 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. Both terms, spray and fog, are used to describe the same test procedure, and are used interchangeably when describing and discussing this test. 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. Pdf accelerated corrosion testing for product qualification. 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 is done inside a temperaturecontrolled chamber. Such calibration of corrosion environment raises very strict requirements. To understand why the salt spray test fails to reliably predict real corrosion performance, it is important to look at the test procedure. The salt spray tests were performed in our uk facility in a qfog model ssp600 chamber.
Development of accelerated corrosion tests involving. Iso 9227 corrosion tests in artificial atmospheres salt spray tests iec. If not, fill up the tank with the required brine concentration, typically 5% wt. Corrosion resistance evaluation of decorative coatings, paint, powder coating, electroplated coppernickelchromium, electroplated coppernickel or. 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. The devices in which these assessments are conducted are known as salt spray rooms. For the test, panels are placed in a 5% salt spray and fog atmosphere for measured periods of time. The procedures used to develop this document and those intended for its. 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 nature of the salt spray test is to subject the specimen to salt fog as a condensate.
Sep 30, 2011 salt spray chamber corrosion test chamber korroxiii testing procedure presto group duration. Figure 1 qfog chamber for the corrosion resistance testing, astm b117 3. And then after 24 hours the unit is taken out and allowed to dry for 24 hours. The continuous salt spray test is particularly useful for detecting. This corrosion test is intended to provide corrosion resistance information on metals and coated metals. E70 test method for ph of aqueous solutions with the glass electrode. 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.
Salt spray testing salt spray test is a method that is used to examine the deterioration level of resistance of covered examples. Coupons of aluminum, aluzn, carbon steel, copper and zinc are exposed, both at sp and at saab. For the test, panels are placed in a 5% salt spray and fog atmosphere for. The complete guide to electrical insulation testing. Astm b11719 covers the apparatus, procedure, and guidelines to create and sustain the salt spray fog test environment. The salt spray test procedure basically, the salt spray test procedure involves the spraying of a salt solution onto the samples being tested. Even better, however is to combine salt spray exposure with humidity cycling. And then it goes back in the chamber and is subjected to the 5% salt spray, or salt fog, for another 24.
Salt spray was first used for corrosion testing around 1914. Figure 4typical record of insulation resistance of a mill motor. 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. Corrosion aging tests in a neutral salt spray chamber were. The spray coating application cycle was repeated one, two or three times on different samples in order to achieve different thickness levels. The samples were subjected to testing in a singleton salt spray cabinet using astm b117 test methods. Modification of astm b117 salt spray corrosion test and its correlation to field measurements of silver corrosion march 2012 corrosion houston tx 683. B368 test method for copperaccelerated acetic acidsalt spray fog testing cass test.
Both industries are represented by trade associations which promote the use of their respective products. The last modification c is a combination between modification a and b i. 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. Salt fog is also known as the fog test or salt spray test. Observations were made at the following exposure steps. Information sheet salt spray testing why it should not. With visual inspection following this test the suitability of. Industry standards in terms of size, test duration and procedure need to be understood and met before undergoing testing. Corrosion testing services including salt spray test corrosion is a form of material degradation that happens when material interacts with its environment. 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 test astm b117 was first used for cor rosion testing around. May 24, 2014 salt spray chamber corrosion test chamber korroxiii testing procedure presto group duration.
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. 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. Quality control of corrosion test results implies the validation of the corrosion test method and estimation of the uncertainty of corrosion rate measurement. 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. D609 practice for preparation of coldrolled steel panels for testing paint, varnish, conversion. The salt spray measurements indicate that the epoxypolyester polymer blend. Hotdip galvanized surfaces are not generally tested in salt spray test see iso 1461 or iso 10684. Neutral salt spray test nss test or acetic acid with copper chloride cass test. The test consisted of combining the exposure to uv radiation and. Specifically, the discussion will concentrate on the salt spray or salt fog test.
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. A military testing standard for equipment specifying a cyclic salt mistfog test consisting of alternating salt mistfog exposures and drying exposures. D1654 test method for evaluation of painted or coated specimens subjected to corrosive environments. Annex e recommended specimen geometries salt spray tests to metal and. Pdf the salt spray corrosion of polymer coating on steel. Salt spray fog testing is typically performed on electroplated, anodized, chemical coated or painted samples for marine, automotive and military equipment. Corrosion resistance evaluation of decorative coatings, paint, powder coating, electroplated coppernickelchromium, electroplated coppernickel or anodized aluminium. 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. To simulate corrosive effects the equipment is exposed to salt mist. 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. E691 practice for conducting an interlaboratory study to determine the precision of a test method. 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.
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. What is the standard practice for operating salt spray fog apparatus. Unfortunately, despite these warnings, salt spray testing is still used in communications to introduce new coatings and materials to the market. Isodis 9227en, corrosion tests in artificial atmospheres. During the course of 80 years of use, there have been many modifications and refinements to b117. Salt spray fog condensate collection issues, astm b117. Suitable apparatus which may be used is described in appendix x1. Open up the rine inlet and ensure is filled at least to the set mark the black line. 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. 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. Astm b117 90 standard test method of salt spray fog. Salt spray fog test the astm b117 test method relies on.
The astm b 11795 testing procedure is the hvac industry standard method of testing the acceptability and longevity of a paint finish. Astm b117 90 standard test method of salt spray fog 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. 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. Standard practice for operating salt spray fog apparatus. After the coating on the boards dried, the samples were placed in the salt fog chamber figure 2. Astm b117 outlines the standard practice for operating the salt spray chamber. Salt spray testing is also a standard in the automotive industry for components.
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