In order to reduce fuel consumption and CO2 emissions, to respect actual environment norms, vehicle weight need to be reduced. Moreover, safety norms impose continuous crash resistance improvement for this reason Advanced High Strengh Steels, which present excellent mechanical properties, are consequently increasingly used in industry, both in sheets and fasteners.
If on one hand the steels used for Fasteners application offer great mechanical performances, on the other hand they are susceptible to corrosion phenomena and that is the reason why the components have to be coated.
The electrochemical deposition is the only process able to apply a very thin coating also in threaded components with complex shapes which vary in thickness. A disadvantage of the electrochemical deposition is the hydrogen formation and adsorption in the metal substrate during the process. When the strength of steel is higher than 1000 MPa, the fastener could be highly sensitive to hydrogen induced delayed fracture. This phenomenon in threaded components can be caused by hydrogen absorbed during pickling and electroplating processes or during corrosion reactions.
Delayed fracture is difficult to be detected and usually happens suddenly for these reasons it becomes fundamental the materials selection and the hydrogen content monitoring in the finished fasteners.
THE NEW INSTRUMENT FOR HYDROGEN ACTIVITY EVALUATION DURING GALVANIC DEPOSITION
HELIOS 2 GALV is an innovative laboratory instrument that can measure hydrogen flux from an exit surface through metallic steels sheet using the process conditions applied in galvanic industry (current density, test solution, temperature, liquid circulation, air insufflation, etc.).
HELIOS 2 GALV is a laboratory equipment used to compare the hydrogen activity of different galvanic baths. The test method is based on the elaboration of the permeation curve obtained for ARMCO Pure Iron sheets.
Once acquired the signal that depends on the hydrogen flux through the examined test sample, is processed by proper mathematical codes (by means of a dedicated panel PC) and hydrogen bath activity is evaluated.
HELIOS 2 GALV is a completely automated instrument!
Letomec offers customized instruments and consultancy to define optimal hydrogen charging conditions (current density, electrochemical solution, re-circulation of the test solution, air circulation, etc.).
THE INNOVATIVE SOLUTION FOR DIFFUSIBLE HYDROGEN CONTENT DETERMINATION IN METALLIC COMPONENTS
HELIOS 3-FASTENERS is an innovative solution to get fast, precise and repeatable measurement of diffusible hydrogen content in metallic samples.
HELIOS 3-FASTENERS can be used:
- to measure diffusible hydrogen content in electroplating components (bolts, fasteners, springs, etc.) foundries, castings, metal manufacturing, welding and fabrication process samples;
- as laboratory instrument for R&D applications.
Once acquired, the signal is processed by proper mathematical codes (by means of a dedicated panel PC), in order to return the diffusible hydrogen content.
Letomec offers a customized solution in function of customer sample dimensions.