Product Description
Foshan Nanhai Wenrui Locks Factory Anti-corrosion Comparative Test Report
Information of test samples:
Test program and standards:
Test program | Test method |
Anti-corrosion Comparative Test | Immerse the samples in a container with hydrochloric acid and nitric acid for 10 minutes. |
Materials used: 1:1 blending hydrochloric acid and nitric acid into strong acid.
Appearance before the test:
Test procedure: Putting the samples respectively into the blended strong acid:
Both samples did not show up any reactions when the test began for a few seconds.
After 3 minutes of immersion,we could see that the reaction of sample 1# was a bit fiercer than the reaction of sample 2#. This appearance resulted from the chromium coating of sample 2# which was being corroded by the strong acid. Because the lock body of sample 1# was forged by 304 stainless steel,the reaction of sample 1# would be stronger than the reaction of the chromium coating on sample 2#’s surface.
After 5 minutes of immersion,we could see that the reaction of sample 1# was basically stopped. But the reaction of sample 2# was clearly speeding because the chromium coating of sample 2# was already been destroyed by the strong acid. After losing the protection of the chromium coating,sample 2# was being corroded at a fast rate and its lock body was bubbling.
Test result:
After 10 minutes of immersion from the strong acid,the 304 stainless steel lock body of sample1# was firstly corroded by the strong acid and it produced a coating that helped itself resist the after corrosion of the strong acid,which had slowed down the rate of the reaction. During the 10-minute immersion, the lock body of sample 2# totally could not defend itself after losing the protection of the chromium coating,which made it completely vulnerable against the strong acid. The lock body of sample 2# was totally ruined. Conclusion and evaluation: According to the test results,the anti-corrosion ability of sample 2# depends on the thin chromium coating on its surface,which makes it vulnerable against the strong acid and any other corrosive conditions. The anti-corrosion ability of sample 2# is proved to be unqualified. On the other hand,the lock body of sample 1# is really adaptive to strong acid and all kinds of corrosive conditions. Its anti-corrosion ability is outstanding and it achieves the requirement of our company’s sample-test.
Test program | Sample | Test conclusion | Test result |
Anti-corrosion Comparative Test | 1# | Qualified | Sample 1# is made of 304 stainless steel,which is very adaptive to corrosive conditions and able to slow down the rate of reaction. The anti-corrosion ability of sample 1# is brilliant. |
Anti-corrosion Comparative Test | 2# | Unqualified | Sample 2# relies on the protection of the chromium coating on its surface against corrosion,which makes its anti-corrosion ability rather weak. |
Foshan Nanhai Wenrui Locks Factory,engineering department (tested) Copyright by SCANPOWER INDUSTRIAL CO.,LTD.
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