Key Performance Characteristics

 
SHS 7570 TWAS coatings exhibit excellent corrosion resistance, high wear resistance, high impact resistance and superior bond strength. Superior bond strength values of these coatings signify that this material has exceptional adhesion and cohesion. High adhesion values highlight the extremely low residual stress (even at high thicknesses) that is an inherent factor in this coating type. High cohesion values mean that the probability of “pull-out” of individual particles is extremely low during wear, erosion and other serviceconditions. Low porosity means low coating permeability, resulting in a highly corrosion resistant barrier. Low oxide content is another key ingredient contributing to the high bond strength of SHS 7570 due to the very limited presence of internal voids and other defects. These characteristics provide predictable coating performance across a broad variety of service environments. SHS 7570 develops extreme passive film stability at a range of pH in both oxidizing and reducing environments. SHS 7570 is especially resistant to corrosion in high chlorine and seawater environments, making it a viable alternative that offers significantly better wear performance than nickel superalloys and stainless steels.

Excellent Corrosion Resistance
SHS 7570 forms a nearly perfect metallic glass coating. In the X-ray diffraction diagram to the right, the broad amorphous hump and almost complete lack of Bragg diffraction peaks indicates that the as-sprayed SHS 7570 coating structure is primarily a metallic glass, representing the ultimate in uniformity. This extreme, almost atomic-level homogeneity makes it very difficult for the electrochemical system to set up specific sites for anodic attack. Simultaneously, the chemistry of SHS 7570 has been optimized so that an extremely stable passive protective oxide layer forms in a wide range of both oxidizing and reducing environments. The combined approach of optimizing the passive film stability and the extreme refinement of the coating microstructure results in high corrosion resistance in a variety of environments, including seawater.

Damage Tolerance
SHS 7570 coatings exhibit excellent corrosion resistance in seawater solutions and salt fog environments. SHS 7570 coatings are also hard (HV300 950 - 1150 kg/mm²) and wear resistant, with properties superior to other high corrosion materials such as nickel superalloys and stainless steels. This allows SHS 7570 to exhibit damage tolerance in a wide variety of conditions. Since the majority of material failures occur at the surface from damage due to wear/abrasion, corrosive attack or the creation of defects leading to fatigue crack initiation, applying SHS 7570 to the surfaces of parts, devices and machines will vastly extend service lifetime, reduce total ownership costs and spawn entirely new material applications in demanding environments and in ways previously not possible.

Spray Parameters
For SHS 7570 TWAS spray parameters, contact NanoSteel at 1-877-293-NANO or info@nanosteelco.com.