Environmental Test Chambers for Volkswagen PV-1210
This Test Specification (PV) is used for corrosion testing in sample and series-production tests conducted on completely painted bodies, body panels, assemblies and components with differing anti-corrosion coatings. It serves to monitor and evaluate corrosion behavior or corrosion protection measures of these parts when exposed to static load.
Test method principle: The test is conducted using cyclically changing combinations of various climatic and/or corrosive loads. One test cycle comprises "C C C" 4 h salt spray testing, nss test procedure according to DIN EN ISO 9227, 4 h aging in standard atmosphere ISO 554-23/50 16 h humid aging at elevated temperature, constant humidity (CH) testing atmosphere according to DIN EN ISO 6270-2.
Changing the testing program is entirely impermissible. After every 5 cycles, a 2-day resting period in standard atmosphere ISO 554-23/50 follows. A test of 15 cycles takes a total of 3 weeks. This testing method is used to evaluate corrosion behavior under static load resulting from salt, humidity and temperature.
Corrosion creepage on a scribing line can be examined in order to evaluate the adhesion of coatings. The scribe must penetrate through to the metallic base material and must be loaded in vertical position (see DIN EN ISO 17872).
The scribe line must be evaluated with regard to loss of adhesion an-c corrosion according to DIN EN ISO 4628-8. Under these defined corrosion conditions different anti-corrosion coatings can be comparatively assessed. A correlation with the corrosion mechanism in actual driving operation is not necessarily possible, as the types of damage and corrosion curves are complex and are not completely covered and reflected by the static corrosion load.
A brief interruption of the test for inspection purposes and/or to remove devices under test is permissible. Assemblies, components and test panels can also be tested in stable or alternating atmosphere chambers. These chambers must comply with the specifications of DIN EN ISO 6270-2, DIN EN ISO 9227 and ISO 554.
Body test：Testing is carried out according to Section 3.1. Examples are given in section 3.6. The body may be turned in order to carry out a specific evaluation of cavities. Before being brought into the salt spray test chamber for the first time, the body, mounted on the pivoting frame, is preconditioned in the ISO 554-23/50 standard atmosphere; it is then moved into the test chamber which is kept at a constant temperature.
Salt spray phase: During the test sequence with rotation, the body is turned about its longitudinal axis so that it is in a different position before each salt spray cycle, according to the following sequence: 0°, 45°, 135°, 225°and 315°.
Aging in standard atmosphere/humid aging at elevated temperature: During the cooling-off phase and during humidity aging at elevated temperature, the body is positioned horizontally.
Repeating the test cycles: After humid aging at elevated temperature is completed according to Section 3.1, the body is immediately placed in the salt spray test chamber; it is then turned 90;a in a clockwise direction to 45°, 135°, 225° or 315°according to the test cycle.
Storing during the weekend: The rest phase entails storing in ISO 554-23/50 standard atmosphere, with the body in horizontal position and placed either in a suitable garage hall or in the test chamber.
Component testing: At least 5 parts are required for complete testing. Cavities are to be made accessible to the salt spray by separating/opening or by altering the asinstalled position. Unprotected trim edges are to be covered before testing.
Evaluation Type of corrosion (coating and/or base metal corrosion) Form of corrosion (surface or edge corrosion) Time of appearance and development of corrosion: After 5, 15, 30, 60 and 90 cycles, the DUTs are evaluated with regard to as well as regard to additional in the anti-corrosion coatings such as loss of adhesion or blisters. Organic coatings car be evaluated according to DIN EN ISO 4628-1, Table 3.
The scribing line is evaluated regarding loss of adhesion and corrosion according to DIN EN ISO 4628-8 and regarding filiform corrosion according to DIN EN ISO 4628-10. Signs of rust creep on painted panels can be examined using a non-destructive thermographic method for quantitative evaluation of the development and spread of defects.
The test is concluded when corrosion grade according to DIN EN ISO 4628-3 or corrosion perforations occur. The following must be specified in the test report.
Test evaluation: start of base metal corrosion: Blistering: Adhesion loss: End of testing: References/notes: Examples of weekly cycle Example 1:
start/End e.g., after 15 cycles: surface corrosion e.g., after 18 cycles: blistering grade 2 (S4) e.g., d=3mme.g., after 30 cycles.
In manufacturing operations from 5:30 a.m. to 10:30 p.m., for one salt spray test chamber and four chambers for humid aging at elevated temperature (Table 1), change-over times max. 2 ;A 15 minutes per test cycle, throughput: eight passenger car bodies Table 1.
Bodies A/B/C/D/E/F/G/H salt spray test cooling phase humidity aging at evaluated temperature: 2:30 p.m.-5:45 a.m.. Mon-sat 6:30 p.m.-9:45a.m. Mon-Sat 10:30 p.m.-1:45 p.m., Mon-Sat 2:30 a.m.-5:45 p.m., Mon-Sat Weekend aqing 6:00 a.m.-5:45 a.m., Sat-Mon 10:00 a.m.-9:45 a.m., Sat-Mon 2:00 p.m.-1:45 p.m., Sat-Mon 6:00 p.m.-5:45 p.m., Sat-Mon 06:00 a.m.-10:00 a.m., 10:15 a.m.-2:15 p.m., Mon-Fri Mon-Fri 10:00a.m.-2:00 p.m,, Mon-Fri 2:00 p.m.-6:00 p.m., Mon-Fri 6:00 p.m.-10:00p.m., Mon-Fri 2:15 p.m.-6:15 p.m.. Mon-Fri 6:15 p.m.-10:15 p.m., Mon-Fri 10:15 p.m.-2:15 a.m., Mon-Fri.
Example 2: In normal shift, for one salt spray test chamber and two chambers . for humid aging at elevated temperature, throughput: four passenger-car bodies Table 2.
Bodies A/B/C/D salt spray test cooling phase humidity aging at evaluated temperature: 4:30 p.m.-7:45 a.m., Mon-Sat 8:30 p.m.-11:45 a.m., Mon-Sat Weekend aqing 8:00 a.m.-7:45 a.m.. Sat-Mon 12:00 p.m.-11:45 a.m., Sat-Mon 08:00 a.m.-12:00 p.m., 12:15 p.m.-4:15 p.m., Mon-Fri Mon-Fri 12:30 .m.-4:30 p.m.. Mon-Fri 4:30 p.m.-8:30 p.m., Mon-Fri.
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