Abrasion resistant coated tube
A coated metal pipe for use as an automotive fluid transport tube is provided comprising: a single or double walled tubing formed into a circular cross-sectional profile; at least one intermediate layer primer layer applied over said tubing: and an outer layer comprising a polyamide incorporating an immiscible additive. The immiscible additive is selected from Ultra High Molecular Weight (UHMW) silicones, UHMW polyethylene (UHMW-PE), polytetrafluoroethylene (PTFE) and mixtures thereof.
1 . A coated metal pipe for use as an automotive fluid transport tube comprising:
a single or double walled tubing formed into a circular cross-sectional profile;
at least one intermediate layer primer layer applied over said tubing; and
an outer layer comprising a polyamide incorporating an immiscible additive selected from Ultra High Molecular Weight (UHMW) silicones and UHMW polyethylene (UHMW-PE).
2 . The coated metal pipe of claim 1 , said polyamide layer further comprising any of a PA11, PA6,10, PA6/12 or PA 12 sacrificial outer layer.
3 . The coated metal pipe of claim 2 , further comprising a nickel plating applied to an inner diameter of said tubing.
4 . The coated metal pipe of claim 1 wherein said tubing comprises steel.
5 . The coated metal pipe of claim 1 , said tubing further comprising any of a copper plated low carbon steel, low carbon steel, stainless steel, or aluminum.
6 . The coated metal pipe of claim 1 , said intermediate layer further comprising a corrosion inhibiting zinc/aluminum alloy or a corrosion inhibiting magnesium alloy further comprising one or more of aluminum, zinc, manganese, silicon, copper, rare earth metals or zirconium.
7 . The coated metal pipe of claim 1 , further comprising said intermediate layer being selected from a group consisting of a chrome free conversion coating, primer or primer/adhesive coating, or passivation coating copper coating.
8 . A coated metal pipe for use as an automotive fluid transport tube, comprising:
a copper plated carbon steel tubing formed into a circular cross-sectional profile;
at least one intermediate primer layer including a corrosion inhibiting alloy applied over said tubing; and
an outer polyamide layer applied over said intermediate layer, said outer layer compounded with an immiscible additive is selected from Ultra High Molecular Weight (UHMW) silicones, and UHMW polyethylene (UHMW-PE), and mixtures thereof at 1-15% by weight.
9 . The coated metal pipe of claim 8 , said polyamide layer further comprising any of a PA 6/12, PA6/10, PA11 or PA 12 sacrificial outer layer.
10 . The coated metal pipe of claim 8 , further comprising a nickel plating applied to an inner diameter of said tubing.
11 . The coated metal pipe of claim 8 , further comprising said intermediate layer being selected from a group consisting of a chrome free conversion coating, primer or primer/adhesive coating, or passivation coating copper coating or a corrosion inhibiting magnesium alloy further comprising one or more of aluminum, zinc, manganese, silicon, copper, rare earth metals or zirconium.
12 . A method for manufacturing a coated metal pipe for use as an automotive fluid transport tube, comprising the steps of:
forming a copper plated carbon steel into a tubing exhibiting a circular cross-sectional profile;
forming at least one intermediate primer layer including a corrosion inhibiting zinc/aluminum alloy applied over the tubing; and
forming an outer polyamide layer applied over the intermediate layer, the outer layer compounded with an immiscible additive selected from Ultra High Molecular Weight (UHMW) silicones and UHMW polyethylene (UHMW-PE) at 1-15% by weight.
13 . The method as described in claim 12 , further comprising the step of applying a nickel plating to an inner diameter of the tubing.
14 . The method as described in claim 12 , further comprising the step of the intermediate layer being selected from a group consisting of a chrome free conversion coating, primer or primer/adhesive coating, or passivation coating copper coating or a corrosion inhibiting magnesium alloy further comprising one or more of aluminum, zinc, manganese, silicon, copper, rare earth metals or zirconium.
15 . The method as described in claim 14 , further comprising the step of applying the chrome free conversion coating at a thickness of 0.2-04 micrometers.
16 . The method as described in claim 12 , further comprising the step of the polyamide layer selected from a group consisting of a PA 6/12, PA6/10, PA11 or PA 12 sacrificial outer layer.