Key Performance Characteristics

 
SHS 7574 coatings exhibit outstanding corrosion resistance in high chlorine, salt fog, concentrated salt and seawater environments. SHS 7574 can be finished to very high surface specifications for applications as a replacement for hard chrome. SHS 7574 also features superior bond strength and high impact resistance. In oxidizing and reducing environments, SHS 7574 develops extreme passive film stability at a range of pH. Corrosion resistance in extreme corrosive environments is superior to crystalline austenitic stainless steel and nickel based superalloys. High adhesion values highlight the extremely low residual stress (even at high thicknesses). High cohesion values mean that the probability of “pull-out” of individual particles from wear and erosion is extremely low. Low porosity means low coating permeability and results in a highly corrosion resistant barrier.
 
High Corrosion Resistance
Corrosion resistance of SHS 7574 is superior to conventional crystalline austenitic stainless steel and nickel based superalloys in extreme corrosive environments. SHS 7574 optimizes glass forming so that it readily forms nearly perfect metallic glass coatings, making it very difficult for the electrochemical system to set up specific sites for anodic attack. Simultaneously, the chemistry of SHS 7574 is optimized so that an extremely stable passive protective oxide layer forms in a wide range of oxidizing and reducing environments.

Damage Tolerance
While conventional high corrosion resistant coating materials exhibit reduced corrosion behavior, SHS 7574 coatings exhibit excellent corrosion resistance in seawater solutions and salt fog environments. Although conventional corrosion materials are soft, SHS 7574 coatings provide hardness and wear resistance equivalent to hard chrome. SHS 7574 has excellent damage tolerance applicable to a wide variety of harsh service environments, such as replacing electrolytic hard chrome.

Hard Chrome Replacement
SHS 7574 is an alternative coating to electrolytic hard chrome and can offer several advantages, including much higher deposition rates, the ability to repair coatings in the field and corrosion resistance superior to hard chrome coatings and wrought austenitic and nickel based superalloys in plate form.

Impact Resistance
In the photo to the right, an SHS 7574 HVOF coating is shown on a sample coupon with multiple drop impact tests at 480 in-lbs. The top right optical micrograph, taken at 100x, shows the typical high density as-sprayed SHS 7574 coating microstructure when applied with recommended spray parameters. The middle and bottom electron micrographs taken at 500x and 1000x by the backscattered electron detector in an SEM highlight the uniformity of the SHS 7574 coating microstructure, which enhances the ability to resist electrochemical attack.

Spray Parameters
For SHS 7574 HVOF spray parameters, contact NanoSteel at 1-877-293-NANO or info@nanosteelco.com.