22 Apr An Overview of Our On-Site Metal Finishing Lab Tests: Part 2
In one of our previous posts, we introduced some of the key tests that we conduct in our onsite metal finishing lab here at CRC Surface Technologies. These rigorous tests ensure that every coated or plated product meets the highest standards of quality. In this second part of the series, we will take a look at several other critical tests that help us maintain precision, durability, and regulatory compliance.
In this post, we’ll explain the following testing processes:
- Phosphate Analysis
- Plating Solution Analysis
- Salt Spray Testing
- Thickness Testing
- Ultraviolet-Visible (UV/VIS) Spectroscopy
- Water Immersion
Let’s get started!
Six Critical Metal Finishing Lab Tests
1. Phosphate Analysis
Phosphate coatings play a crucial role in improving corrosion resistance, adhesion, and wear resistance. To maintain the integrity of our process, we conduct regular solution analysis and coating evaluations to assess the proper chemical constituent balance of the tanks, as well as the coating weight, and corrosion resistance of the coated parts. These tests ensure that the phosphate coating meets industry specifications and will provide optimal surface protection and adhesion for subsequent layers such as paint, powder coating, or lubrication.
2. Plating Solution Analysis
The performance of electroplated coatings is heavily dependent on the chemistry of the plating solution. Our plating solution analysis involves strict testing, including:
- Measuring metal ion concentrations
- Assessing pH levels
- Measuring primary chemical constituent concentration(s)
- Ensuring contaminants are within acceptable levels
- Ensuring concentrations are compliant with any external specifications
Closely monitoring these factors allows us to maintain stable plating processes and prevent defects such as uneven coatings, discoloration, and adhesion failures.
3. Salt Spray Testing
Salt spray testing (ASTM B117) is one of the most widely used accelerated corrosion tests in the industry. We evaluate the corrosion resistance of coated and plated samples by exposing them to a controlled salt fog environment. This test helps us ensure that our finishes meet or exceed durability expectations. This test is particularly useful for marine and aerospace components, or any other parts that must withstand harsh environmental conditions.
4. Thickness Testing
Achieving precise coating thickness is essential for the performance and longevity of metal parts, as well as for compliance with industry standards. We use optical microscopes to measure plating and coating thickness with precise accuracy. This test provides a clear visual representation of the cross-section, allowing us to verify uniformity and detect any potential issues such as porosity or improper adhesion.
5. Ultraviolet-visible (UV/VIS) Spectroscopy
With UV/VIS spectroscopy, we can maintain strict control over solution quality, preventing plating defects and ensuring superior performance of the final finished product. This powerful technique is used to measure the concentration of specific elements or compounds in certain plating solutions.
Spectroscopy helps us:
- Identify contaminants
- Verify the presence of essential additives
- Ensure the consistency of chemical compositions
6. Water Immersion
Water immersion is a corrosion-testing process that assesses the ability of metal coatings to withstand prolonged exposure to moisture. By submerging samples in water and alternately drying, for set durations and a set number of repeating cycles, we can identify potential issues of corrosion initiation. This test is particularly valuable for evaluating coatings intended for applications where parts may be exposed to intermittently wet, humid, or submerged environments.
Reliable Metal Finishing Services in Phoenix
At CRC Surface Technologies, we are committed to delivering superior quality metal finishing through rigorous testing and process control. We offer over 33 different finishing techniques, from electroplating to anodizing, passivation, and more. You can trust that your finished products will be durable, long-lasting, and compliant with industry standards. Call us at 602-253-4175 today to learn more about our services, or send a message to rfq@chemresearchco.com to request a quote.
Images used under creative commons license – commercial use (4/10/2025). Photo by Alireza Hatami on Unsplash