扬废腐蚀试验
Abstract
Lift-off corrosion testing is a method used to evaluate the corrosion resistance of metals and other materials. The corrosion test involves placing a sample in an environment that encourages lift-off corrosion and then applying a load to the sample. The lift-off corrosion test can be used to evaluate the corrosion resistance of metals, alloys, and other materials to a variety of oxidizing and acidic environments. The test can be used to evaluate the effectiveness of protective coatings, such as paints and electroplated nickel. Adkwardly, it has also been used to assess the effects of certain industrial processes, such as aluminum anodizing and galvanizing.
Introduction
Lift-off testing is a form of accelerated corrosion testing. This type of corrosive test uses a thinmetal sheet, mimicking a metal panel, in an oxidizing environment to assess the material’s resistance against oxidation (often in the form of rusting). The test sample is subjected to an accelerated lift-off process which involves exposure to a corrosive environment, followed by a load application. This load application is designed to induce further corrosion, simulating the strain on a panel in a real-world application. Through careful selection of the material and the type of corrosion environment, the resulting lift-off corrosion test can provide data about the material’s resistance against the corrosive environment, the effects of strain on the material, and the lifespan of the material when put into a typical application.
The lift-off test is typically used for metal samples, although other materials can also be tested. These tests are commonly used to evaluate metal coatings, such as paints and electroplated nickel, industrial processes such as anodizing and galvanizing, and the corrosion resistance of metals, alloys, and other materials. The test results are then used to make decisions regarding the types of coatings applied to the material, and the longevity of the material in a given application.
Methodology
The lift-off test is typically conducted in a laboratory. The sample is placed in an oxidation chamber which is designed to create an environment conducive to oxidation, as well as simulate the actual stress and strain that may be encountered during actual service. After the test environment is established, a load (such as a weight) is placed on the sample. The load is designed to induce further corrosion and simulate the effects of the stress and strain encountered in a real-world application. The sample is then left in the oxidation chamber for a period of time pre-determined by the testing laboratory.
After the specified time has elapsed, the sample is removed from the corrosion environment and examined for signs of corrosion and degradation. The results of the lift-off test are typically reported in terms of the area, weight, and depth of lift-off corrosion which has occurred. The test data is then used to assess the corrosion resistance of the material, the effectiveness of protective coatings, and the effects of strain on the material.
Conclusion
Lift-off corrosion testing is a method used to evaluate the corrosion resistance of metals and other materials. The test involves exposing the sample to an environment that encourages lift-off corrosion, then applying a load to the sample. Through careful selection of the environment and the type of load, the resulting test can provide data about the material’s resistance to oxidation, the effectiveness of protective coatings, and the effects of strain on the sample. Using this method, decisions can be made regarding the types of coatings applied to the sample and the longevity of the material in a given application.
