MaTestLab > Test Standards > ASTM A90 Weight of Coating on Iron and Steel Articles with Zinc or Zinc-Alloy Coatings
ASTM A90 Weight of Coating on Iron and Steel Articles with Zinc or Zinc-Alloy Coatings
ASTM A90 is a standard test method that measures the weight of zinc or zinc-alloy coatings on iron and steel articles. This test is useful in determining the quality of the coating and the amount of protection it provides to the underlying metal substrate.
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Introduction to ASTM A90
ASTM A90 is an essential test method for determining the weight of the coating on iron and steel articles. The test method is widely used in the industry for quality control and specification purposes. The test method is essential in ensuring that the coated articles meet the required standards and offer adequate protection to the underlying metal substrate.
ASTM A90 is generally applicable to all types of zinc and zinc alloy coatings. The results obtained through this method are specially used for quality control, reliability check, performance evaluation, and specification purposes.
ASTM A90 Test Method
ASTM A90 test method involves weighing the coated article and then subtracting the weight of the uncoated article to obtain the weight of the coating. The test method has two variations: the magnetic method and the weighing method.
Magnetic Method
The magnetic method involves using a magnetic thickness gauge to measure the thickness of the coating. The thickness reading is then used to calculate the weight of the coating using a conversion factor. The conversion factor is obtained by multiplying the thickness of the coating by a specific value based on the density of the coating material.
Weighing Method
The weighing method involves weighing the coated article before and after removing the coating. The difference in weight is then used to determine the weight of the coating.
ASTM A90 Specimens
Specimen details
The specimens used in the ASTM A90 test method are iron and steel articles with zinc or zinc-alloy coatings. The coatings are ensured to be continuous and uniform over the entire surface of the article.
Specimen dimensions
The acceptable specimen size for ASTM A90 depends on the thickness of the zinc or zinc alloy coatings.
Specimen preparation
The specimens are cleaned and prepared as per the test requirements. The uncoated weight of the specimen is obtained before coating it with zinc or zinc alloy.
ASTM A90 Results
The results obtained from the ASTM A90 test method are used to determine the weight of the coating on iron and steel articles. The results are reported in grams per square meter (g/m2) or ounces per square foot (oz/ft2). The results obtained can be used for quality control, material specification, and research purposes.
Tests related to ASTM A90
ASTM A90 is similar to several other standards that evaluate the weight of coatings on metal articles, including ISO 1461 and ASTM B633. ISO 1461 specifies the general requirements for hot-dip galvanized coatings on iron and steel articles, while ASTM B633 provides a standard for electrodeposited coatings of zinc on iron and steel.
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How many samples are required for astm a90?
The required number of samples or specimens should comply with the procedure given in the astm a90 standard. However, the MaTestLab operations team can assist you for your special requirements once you share your testing details with us.
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How many days will it take to complete the astm a90 test?
The turnaround time for astm a90 test methodology depends upon the test procedure mentioned in the standard test document. However, we at MaTestLab understand your research requirements and hence try to get your test completed within the least possible time.
Where can I get the astm a90 tested?
You can share your astm a90 testing requirements with MaTestLab. MaTestLab has a vast network of material testing laboratories, spread across the USA and Canada. We support your all material testing needs ranging from specific astm a90 test to various testing techniques.
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