Thinly coated indicator plates for corrosion test MAT-CH

Abstract

The corrosion and indicator test according to Oddy is used in the field of preventive conservation when testing materials for display cases, cabinets, museum rooms or also packaging materials for museum objects, among other things. The invention of the HTW Berlin and the TU Berlin is intended to enable a standardization of the previous test procedure.

background

Up to now, metal strips made of silver, copper and lead have been used for the Oddy test. These indicators made of pure metal often have limitations or are highly operator-dependent, which leads to poor reproducibility of the tests and thus runs counter to the efforts to standardize the Oddy test, which is used worldwide.

Innovation / Solution

Through the defined production of indicators produced in the vacuum plasma process, a significant improvement in their reproducibility as well as a simplified application and evaluation of the test results should be achieved. The method of hollow cathode gas flow sputtering is to offer a wide range of possible approaches for use in the accelerated corrosion test according to Oddy. Instead of pure metals, glass substrates are to be used which are (thinly) metallically coated by means of physical vapor deposition. While the silver and copper coatings are to be produced using the hollow cathode gas flow sputtering (GFS) process, a magnetron sputtering system is to be used for the lead surfaces.

Benefits

fields of application

Conservation and restoration, preservation of cultural assets, inventory management