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US 11,486,014 B2Granted
Method for producing plated black heart malleable cast iron member, plated black heart malleable cast iron member, and pipe joint
AssigneeHitachi Metals, Ltd.
InventorsRyo Goto, Takayuki Fukaya, Hiroshi Matsui, Akinori Sawada
Life of this patent
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Abstract
Provided is a method capable of producing a plated black heart malleable cast iron member having a plating layer with excellent adhesiveness to a black heart malleable cast iron member, while having less burden on the environment, compared to conventional methods.
Claims16
A method for producing a plated black heart malleable cast iron member having a plating layer on a surface of a black heart malleable cast iron member, the method comprising:
- performing graphitization in a non-oxidizing and decarburizing atmosphere to form a ferrite layer on the surface of the black heart malleable cast iron member such that an oxide layer formed on the ferrite layer during graphitization has a thickness of 20 μm or less;
- immediately thereafter, immersing the black heart malleable cast iron member obtained after the graphitization, in a flux for 3.0 minutes or more so as to remove the oxide layer;
- heating the black heart malleable cast iron member taken out of the flux, to 90° C. or higher;
- and
- performing hot-dip plating on the heated black heart malleable cast iron member.
2 more elements
Dependencies are inferred from the claim text.