Abstract: An improved mixing device for viscous liquids includes an elongated body with an opening extending axially through the entire length of the body. An elongated diffuser is located in the opening with pathways therein for forming a circuitous path for mixing viscous liquid flowing under pressure through the opening. There are stops associated with both ends of the diffuser for holding it in place in the opening when liquid is flowing through the diffuser. At least one of the stops is removable and includes female threads which cooperate with male threads on the outer surface of the body so that when the stop is removed the diffuser can be axially removed from the opening through at least one end thereof, an end of the diffuser being accessible through the other end of the opening and shaped so that an axial force can be applied to remove the diffuser, if necessary.

Abstract: A zinc-enriched protective coating comprises a vehicle containing an alkali-lithium silicate solution with sufficient alkali silicate, preferably lithium, to provide a self-curing one-coat composition, an organic interpolymer latex to provide improved adhesion, and zinc dust to provide cathodic protection.