26 Sep An Overview of Our Onsite Metal Finishing Lab Tests: Part 1
Metal coatings must meet stringent quality standards, no matter the industry or application. At CRC Technologies, we know that metal finishing involves a lot more than just applying a coating. That’s why we rely on a range of lab tests to deliver metal finishes that are always durable and precise. Our onsite lab is an integral part of our commitment to quality control.
In this two-part series, we’ll explore some of the most common metal finishing tests we perform, so you can take a peek behind the scenes.
First, we’ll discuss the importance of the following testing methods:
- Atomic Absorption Spectroscopy
- Coating Weight Testing
- Copper Sulfate Testing
- High Humidity Testing
- Hull Cell Analysis
- Metallic Contamination Detection
- Microhardness Testing
Seven Important Lab Tests for Metal Finishing
1. Atomic Absorption Spectroscopy
Atomic absorption spectroscopy (AAS) is a test we use to measure how much metal is in a solution. It helps us make sure that our metal coatings are the right thickness and quality, both in how they function and how they look.
AAS is great for checking the levels of metals like zinc, nickel, and copper in plating solutions. By analyzing the sample’s absorbance of specific light wavelengths, we can pinpoint exactly what metals are there and in what amounts, ensuring our plating solutions are kept at optimal conditions.
2. Coating Weight Testing
This test measures how much coating has been applied to a metal surface. In simpler terms, it checks whether the coating is thick enough to do its job right. This test is crucial for ensuring an even, uniform coating that will effectively prevent rust or provide a suitable foundation for additional coatings or paint.
3. Copper Sulfate Testing
Surface contamination or ineffective passivation lead to corrosion and cause the premature failure of metal components. We use a copper sulfate test to check if there’s any free iron still present following passivation treatment to the surface of stainless steel and other alloys.
For this test, we simply apply a copper sulfate solution to the passivated surface of a substrate. If there is any free iron present, a copper layer will form, indicating contamination. This quick and easy test helps us ensure the part surface has been adequately protected from future corrosion.
4. High Humidity Testing
High humidity environments can accelerate corrosion and degrade coatings. The high humidity test (also known as a humidity cabinet test) simulates what happens when a metal coating is exposed to humid environments for a long period of time.
To perform this test, we place samples in a controlled environment with high humidity and elevated temperature to see how our coatings hold up. This gives a good idea of whether a coating will stand the test of time or start breaking down under real-world conditions. We then make adjustments as necessary to improve durability and reliability.
5. Hull Cell Analysis
We use this versatile diagnostic tool to troubleshoot and optimize chemical baths for electroplating. It lets us see how the plating bath performs under different conditions, helping us fine-tune our process and troubleshoot any potential issues like impurities, imbalances, or insufficient additives.
6. Metallic Contamination Detection
Detecting metallic contamination is another critical step in metal finishing. Contaminants in plating solutions can cause all sorts of problems, from poor performance to safety hazards.
We use various techniques, such as atomic absorption spectroscopy, to detect levels of metals and to keep our processes free from harmful contaminants. By regularly monitoring for metallic contaminants, we can ensure the plating solutions will provide reliable coatings and prevent product failures.
7. Microhardness Testing
Testing the hardness of metal platings and coatings is critical for determining how they will resist wear. We employ the Knoop and Vickers microhardness testing technique, which involves pressing a diamond indenter into a cross-section of the plating layer and measuring the size of the indentation. This test is perfect for checking the hardness of plating coatings that are likely to be exposed to excessive wear, so as to ensure the plating layer is tough enough for their intended function.
We Offer Over 33 Different Metal Plating Services
Looking for reliable, high-quality metal finishing services? At CRC Surface Technologies, we offer over 33 different metal plating services, all backed by rigorous lab testing and quality control.
Whether you need aluminum anodizing, cadmium plating, stainless steel passivation, or any other surface treatment, our team is ready to deliver exceptional results. Call us at 602-253-4175 today or email rfq@chemresearchco.com to request a quote.
Stay tuned for part two, where we’ll explore additional advanced testing methods that help us meet stringent industry standards.
Images used under creative commons license – commercial use (9/26/2024). Photo by Kateryna Babaieva on Pexels