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Titanium Parts Need Titanium Brushes
The Problem with Using Stainless Steel Brushes
The use of stainless steel brushes on titanium parts has been a common practice since titanium came into widespread industrial use. When a titanium part is brushed with a stainless steel brush, small amounts of the stainless steel are abraded from the brush fiber and embedded in the surface of the titanium. The two dissimilar metals are physically bound. When moisture is added, the result is the creation of a battery and the start of galvanic corrosion.
How much corrosion is acceptable? That would, of course, depend on where it appeared: In your artificial heart valve? In the actuator arm of a space probe? In the rudder control assembly of a 747? The solution to the problem is to use titanium brushes on titanium parts. No dissimilar metals = no battery = no corrosion.
Anodic Index V
In normal environments, such as storage in warehouses or non-temperature and humidity controlled environments there should not be more than 0.25 V difference. A 300 series brush is marginally acceptable but, a titanium brush is preferred.
In controlled environments that are temperature and humidity controlled, 0.50 V can be tolerated. A titanium brush is not required
In harsh environments, such as outdoors, high humidity, and salt environments there should be not more than 0.15 V difference in the "Anodic Index." The only acceptable wire brush would contain 100% titanium.
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