The copper sulfate test is planned to test the viability of passivation. It can likewise be utilized to decide whether there is a requirement for passivation.
The motivation behind the copper sulfate test is to decide the nearness of free iron which is typically initiated onto the surface of a section amid manufacture with steel segments. The standard of the test depends on an oxidation-diminishment response which makes the broke down copper particles store or plate out onto the free iron particles.
This test is suggested for the identification of free iron on the surface of austenitic stainless steels in the 200 and 300 arrangement, precipitation solidified stainless steels, and ferritic 400 arrangement stainless steels having at least 16 % chromium. This test isn't suggested for martensitic 400 arrangement stainless steels with under 16 % chromium in light of the fact that these steels will regularly give a positive sign regardless of the nearness or nonappearance of anodic surface contaminants. This test is likewise not suggested for laser stamped territories.
Application strategy
The test arrangement is connected to the surface of the example speaking to a considerable measure of passivated parts, applying extra arrangement if necessary to keep the surface wet for a time of no less than 6 minutes. Toward the finish of this period, the surface should be deliberately washed and dried with mind taken not to exasperate copper stores if show. The test might not display copper stores unmistakable to the bare eye.
A copper shading on the metal surface (dark colored or pinkish, similar to a penny) shows that surface iron was as yet present and is viewed as a test disappointment. On the off chance that no response happens it is viewed as a test pass.
Note:
For best outcomes, permit a couple of hours after passivation before testing. The copper sulfate test may not really show a positive sign of iron on unpassivated parts. A disappointment state can be promptly seen by utilizing the copper sulfate arrangement on a bit of carbon steel.
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