Sheraplex
The Sheraplex process is a Duplex system which utilises the excellent sacrificial corrosion protection afforded by the Sheradizing process combined with an organic barrier layer.
The characteristic matt textured surface of the Sheradizing also provides an excellent key to the organic barrier layer enhancing the performance of both processes.
The Sheraplex Process.
Sheradizing.
The first element of the Sheraplex system, Sheradizing, is a diffusion of Zinc Dust. The process is normally carried out in a slowly rotating closed container at a temperature within the range 320-500°C, depending upon the base material and its condition.
Pre Top Coat.
The resultant zinc/iron alloyed coating is subsequently Zinc Phosphate resulting in a clean, passivated, matt grey surface. The coating closely follows the contours of the base material and uniform coatings are produced on articles including those of intricate shapes.
The second element to the duplex coating is an organic barrier layer. Applied by either a dip/spin, dip/drain or spray technique, this layer is subsequently cured at 200°C resulting in a uniform, complete coverage coating which allows intricate shaped and precision machined components to be treated.
Main Benefits
Long term environmental protection
Coating deposits 35-60microns
Salt spray resistance 1000 hours (25 microns of zinc)
A high degree of sacrificial protection
Repeatable torque values .0.14
No Hydrogen embrittlement
Coating Specification
Sheradized minimum deposit - 15μm. Average deposits - 30μm
Organic barrier layer minimum deposit - 10μm. Average deposits - 12μm.
Sheraplex coating average - 42μm.
The thickness of both layers can be increased to further improve corrosion resistance if required.
The organic barrier layer is available in a variety of colours - black, blue, silver, red, yellow, green, orange.
Properties
Long term environmental protection.
Minimum 1000 hours salt spray test to ASTM B117.
Repeatable torque tension control to BS7371 Part 2 1993.
Uniform diffused zinc/iron alloy coating plus organic barrier layer, useful for protecting irregularly shaped components.
The substrate has relatively high degrees of wear resistance to withstand abrasion and handling.
No hydrogen embrittlement.
Sacrificial.
Relatively low processing temperature.
Comments
The Sheraplex process has been developed to meet the requirements of the Water, Oil and Gas industries who have recognised the benefits of a combines substantial sacrificial protection with a barrier layer to withstand exposure to extreme environments. Sheraplex coatings overcome the problems of substrate corrosion caused by damage to the organic layer during assembly of components, offering substantial sacrificial protection preventing substrate corrosion in the vent of damage.
Approvals
Sheraplex WIS is approved by W.R.C Certificate Number PT/01/0696 to meet the requirements of WIS 4-52-03.