Non-Chromate Conversion Coatings - Iridite NCP

For customers that require a non chromate conversion coating to satisfy the requirements of the RoHS and WEEE directives, we offer Iridite NCP which produces a clear surface coating with corrosion resistance of upto 1000 salt spray hours using ASTM B117. Iridite NCP is also temperature resistant making it suitable for high temperature operating environments such as automotive engine components and electronic heat sinks, as well as offering excellent adhesion to paints, sealants & adhesives.

Restrictions

Aluminium alloys with greater than 2% copper content will greatly reduce salt spray life.

Maximum Size Criteria

The table below outlines the maximum size criteria for Iridite NCP non-chromate conversion and Surtec hexavalent chromium free passivation:

Dimension	All NCP Coatings	Surtec 650	Surtec 650V
Length	2130mm	2130mm	1200mm
Width	600mm	600mm	600mm
Depth	850mm	850mm	850mm

Surtec 650

We are now offering Surtec 650, a hexavalent chromium free passivation for aluminium based on trivalent chromium which offers excellent bare corrosion protection comparable to hexavalent passivation. Surtec 650 produces an iridescent, faintly blue to tan visible layer suitable as a pretreatment before lacquering, powder coating or gluing. Surtec 650 also exceeds the requirements of MIL-DTL-81706 and MIL05541 for bare corrosion (336 h in NSS per ASTM B-117, respectively, DIN 50021 SS); offers low contact resistance <0.8mOhm/cm² and is heat resistant up to 100^oC with minimal loss in corrosion resistance.