Thickness Requirements

Frank · 2015-03-11T20:13:05.000Z

Hi, We are considering to use the Ultramet tantalum coatings on our valve components but was wondering how thick the surface needs to be to account for the corrosion rate of the media. We have various applications in HCl and HBr and Hastelloy C276 is not providing an acceptable life. Frank

Frank asked on March 11, 2015
Hi,

We are considering to use the Ultramet tantalum coatings on our valve components but was wondering how thick the surface needs to be to account for the corrosion rate of the media. We have various applications in HCl and HBr and Hastelloy C276 is not providing an acceptable life.

Frank
Ultramet CPT Corrosion Experts replied on March 11, 2015
Hello Frank,

The nice thing about tantalum is that in most concentrations and temperatures of HCl and HBr there is no corrosion rate. That is why a thin surface can work and from a from a corrosion point of view, the thickness is not critical.

However if the conditions did impose a corrosion rate on tantalum then the thickness of our tantalum diffusion surface would become important.

The typical thickness we provide is 0.002" (50um) however depending on the mechanical / fitment needs of the application we may choose to adjust this to be either thicker or thinner.