Hot-dip galvanized coating for steel

Details Hot-dip galvanized coating for steel Hot-dip galvanized coating for steel

1987-08-28

1989-10-10

McDowell, Robert

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

4274197, 427433, 428570, B32B 1518, B05D 118

Patent

active

048731536

ABSTRACT:
A hot-dip galvanized coating for improved resistance welding of galvanized steel parts or sheets includes particles of a metal phosphide, and preferably ferrophosphorus particles, having a particle size of from about 0.1 to about 30 microns such particles being included in the galvanized coating while the zinc is still molten. The coating can also include up to about 40% by weight of the metal phosphide of an additional metal such as nickel, tin, aluminum or lead, which can be incorporated in the coating as discrete particles or deposited onto the surface of the metal phosphide particles.
The advantages of the present invention include a significant reduction in welding current and an increase in electrode life, as well as simplified application of the coating by incorporating the metal phosphide particles directly into existing coating lines.

REFERENCES:
patent: 4011088 (1977-03-01), Makishima et al.
patent: 4110117 (1978-08-01), McLeod
patent: 4470897 (1984-09-01), Iezzi et al.

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