Abstract: A chromium-free corrosion inhibiting coating composition, which does not utilize harmful chromium compounds and can be used for corrosion inhibition of a metal surface, comprising a slurry mixture in which coated aluminum fine powder treated with a hydrophilic coupling agent is suspended in an acidic phosphate bonding solution and which can be stored in a refrigerator, is disclosed. A titanium-coupling agent is preferable to use as the coupling agent, which treats a surface of the aluminum fine powder. In this aqueous chromium-free corrosion inhibiting coating composition, 25 to 40% by weight of the aluminum fine powder a surface of which is treated with the coupling agent is suspended in the acidic phosphate bonding solution.

Abstract: A chromium-free corrosion inhibiting coating composition, which does not utilize harmful chromium compounds and can be used for corrosion inhibition of a metal surface, comprising a slurry mixture in which coated aluminum fine powder treated with a hydrophilic coupling agent is suspended in an acidic phosphate bonding solution and which can be stored in a refrigerator, is disclosed. A titanium-coupling agent is preferable to use as the coupling agent, which treats a surface of the aluminum fine powder. In this aqueous chromium-free corrosion inhibiting coating composition, 25 to 40% by weight of the aluminum fine powder a surface of which is treated with the coupling agent is suspended in the acidic phosphate bonding solution.

Abstract: Bolt-seating plug in which a bolt is secured by an inner end block means which is accommodated within the inner chamber of the plug having the shoulder wall wider than the central portion of the plug accommodating the shank of the bolt, whereby bolt-withdrawal force acts as a more easily resisted compressive force on the inner end block means, and which comprises a threaded nut through which the bolt is screwed, and a ring which is made of soft synthetic resin, through which the bolt is passed completely, partly by screwing and partly by forcing, and which has a thickness such that it may contribute to a required degree to bolt-holding force.