OF THE DISCLOSURE One side surface of a strip of metal is contacted with a surface of a molten metal bath which is locally raised under ultrasonic vibration whereby a continuous coating is attained on one side only. A tool for imparting the ultrasonic vibration to a bath is immersed near the bath surface and the ultrasonic vibrator connected to the tool is contained in hollow holding means dipped in the bath. In accordance with the apparatus of the present invention, the worn tool can be exchanged in a short time and the molten metallic coating on one side only of the strip of metal can be attained over a long time.

One side surface molten metallic coating apparatus

A substrate surface which is to be partially coated with poly(arylene sulfide) is masked, in those areas not to be coated, with a masking composition containing diatomaceous earth, alkaline earth carbonate, or alkaline earth silicate. The substrate surface is then coated with poly(arylene sulfide) and, after the coating has cured, the coating is peeled away from the masked portion of the substrate. The masking composition is then washed from the finished product.

Selective coating of a substrate with poly(arylene sulfide)

Masking composition for galvanized metal

In the gas jet wiping of galvanised wire strip or tube, the gas jet wiping nozzle 10 and, preferably a reactive gas containment vessel 30 used for modifying the surface coating on the wire 16, are made in two or more non-annular parts 17,18;31,32 which when abutted together form an annulus. The parts may be releasably held together in their abutted annular form until the wire 16, strip or tube requires to be rethreaded, then the parts 17, 18;31,32 can be separated from one another transversely of the direction of travel of the wire 16, strip or tube through the nozzle 10 or containment vessel 30. The threading of the wire 16, strip or tube through an annular nozzle 10 or containment vessel is thereby avoided.

Jet wiping nozzle

In a method of galvanizing a portion only of a ferrous metal article, in particular for galvanizing one side only of a thin flat ferrous metal strip, the material used for forming a protective coating on the part of the article not to be galvanized is a suspension comprising a liquid suspending vehicle consisting of water and from 5 to 20% by weight, preferably from 6 to 16%, of the powdered hydrated form of magnesium silicate known as talc. The suspension preferably also includes a bonding or etching agent to increase the adherence of the coating to the article, a wetting agent to facilitate spreading of the coating, a thickener to facilitate the suspension of the powdered material and a defoamer if necessary.

Method of galvanizing a portion only of a ferrous metal article

Method of coating metals

A gas wiping die for wiping wire issuing from a molten metal coating bath is provided with critical parameters with respect to the die angle, the length and thickness of the die orifice and the relationship of the sides of the orifice, the throat diameter of the die and the height above the molten bath surface. The thickness of molten coatings on wire wiped with the combined die can be very accurately controlled by changes in wiping gas pressure.

Roger L. Crandall

Papers

Method of coating metals

Gas wiping apparatus and method of using