Non-Chromate Conversion Coatings - Iridite NCP



Non-Chromate Conversion Coatings - Iridite NCP



Non-Chromate Conversion Coatings - Iridite NCP

RoHS and WEEE ComplianceFor 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.


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:

All NCP Coatings
457mm (1.5')
457mm (1.5')
910mm (3')

Subject to demand we would consider increasing the size of our NCP tank to enable us to process larger components in future.

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 100oC with minimal loss in corrosion resistance.

Metro Engineering and Plating Works Ltd - Unit 3 - Chartridge Development - Eskdale Road - Uxbridge - Middlesex - UB8 2RT - UK
Tel: 01895 254666 - E-mail:
Sulphuric Acid Anodising - Chromic Acid Anodising - Hard Anodising - Chromate Conversion - Iridite NCP - Stainless Steel Passivating
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