Lowest Resistance Aluminum Finish

In summary, when purchasing aluminum standoffs, it is important to consider the different finishes available. The lowest resistance finishes are anodized and iridite, but they may not offer as much protection against corrosion. Other options, like Alodining, offer a balance between conductivity and durability. To ensure a good conducting path, the coating can be sanded off at the ends where the standoff contacts the board and case. However, there is a risk of corrosion if the coating is removed and moisture gets in. It is recommended to use a separate ground strap or rely on grounding through the standoffs to avoid this issue.
  • #1
j777
148
0
Hello,

When purchasing aluminum standoffs you can get them with many different finishes. Which finishes have the lowest resistance and offer protection against corrosion?

The following link lists finishes available from a popular electronics hardware manufacturer.
 
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  • #2
If you are that concerned about low resistance I would recommend using a separate ground strap instead or relying on grounding through stand-offs.
 
  • #3
I'm not necessarily "that" concerned I'm just looking for advice on common finishes like iridite, anodized, etc...
 
  • #4
Not really an expert but anodise is pretty high resistance, but without anodise you are going to form Al oxide which is also insulating.
Since the post only contacts the board at the top and the case at the bottom, you could just sand off the coating at the ends to make a good conducting path. Depending on how well the coating has been applied the screws will probably strip it out of the threads you are using tapped standoffs.

The main concern with no coating (or only a thin one ) would be that if the Al is in contact with copper on the circuit board and any moisture gets in you will have a corrosion cell.
 
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  • #5
You have a tradeoff because the really hard protective coatings are non-conductive, and the conductive coatings are not so durable. Alodining is a conductive finish that offers some protection. Don't know how long it will hold up in a really corrosive environment.
 

Related to Lowest Resistance Aluminum Finish

1. What is a "Lowest Resistance Aluminum Finish"?

A "Lowest Resistance Aluminum Finish" is a type of coating or surface treatment applied to aluminum materials to reduce their electrical resistance. This type of finish is commonly used in electronic and electrical applications where low resistance is important.

2. How is a "Lowest Resistance Aluminum Finish" applied?

A "Lowest Resistance Aluminum Finish" can be applied using various methods such as anodizing, electroplating, or chemical conversion coating. The specific method used will depend on the desired properties and application of the aluminum material.

3. What benefits does a "Lowest Resistance Aluminum Finish" provide?

A "Lowest Resistance Aluminum Finish" provides several benefits such as improved electrical conductivity, corrosion resistance, and increased durability. It can also help to reduce friction and improve the surface appearance of the aluminum material.

4. Is a "Lowest Resistance Aluminum Finish" suitable for all types of aluminum?

No, a "Lowest Resistance Aluminum Finish" may not be suitable for all types of aluminum. It is important to consider the specific properties and composition of the aluminum material before choosing a finish. Consulting with a professional is recommended to determine the best finish for your specific application.

5. How do I maintain a "Lowest Resistance Aluminum Finish"?

To maintain a "Lowest Resistance Aluminum Finish", it is important to avoid harsh chemicals and abrasive materials that can damage the finish. Regular cleaning and inspection can also help to identify any potential issues or areas that may need touch-up. It is also recommended to follow the manufacturer's instructions for proper maintenance and care.

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