T.C.P. Process Surtec 650
Hexavalent chromium free Passivation for aluminum, magnesium & casted aluminum alloys. suitable as post-treatment of anodic coatings (Anodizing) and conversion coating of magnesium alloys, excellent bare corrosion protection comparable to hexavalent passivation. It produces an iridescent, faintly blue to tan and visible layer, Complies with LN 9368-3 ID-number 1108 meets or exceeds MIL-DTL-81706B and MIL-DTL-5541F for bare corrosion (336 hours in NSS. per ASTM B-117, respectively, DIN EN ISO 9227) low contact resistance: < 5000 µOhm per square inch per MIL-DTL-81706B, heat resistant inorganic passivation layer (see “hints”) applied for US-patent: 6,375,726; 6,511,532; 6,521,029; 6,527,841.