摘要:
A method for removing dissolved oxygen from alkaline water containing dissolved oxygen at a temperature greater than 250.degree. F. which comprises the step of: adding to said alkaline water containing dissolved oxygen an effective oxygen-scavenging amount of a water-soluble semicarbazide of the formula ##STR1## wherein R.sub.1 and R.sub.2 are selected from the group consisting of C.sub.1 -C.sub.10 alkyl, cycloalkyl, aryl, cycloalkyloxy and alkyloxy groups.Preferred materials are 4-phenyl semicarbazide, 4-isopropyl semicarbazide, 4-4-diethyl semicarbazide and carbazoyl morpholine. Below 400.degree. F., a catalyst is also required.
摘要:
A method for treating water to retard corrosion due to dissolved oxygen, especially boiler feed waters and boiler water condensates, is disclosed. Semicarbazide and its salts are highly effective oxygen scavengers for use in aqueous systems and thereby effect reduction of corrosion resulting from dissolved oxygen.
摘要:
A rust preventive agent which contains, as an active component, at least one species selected from a compound of the formula (1) or (2) and a salt thereof; a rust preventing method and a rust preventive resin composition using the rust preventive agent.
摘要:
Disclosed are selected poly(oxyalkylated) hydrazines of the formula: ##STR1## wherein R is selected from hydrogen, lower alkyl groups having from 1 to 4 carbon atoms, phenyl and mixtures thereof; and the sum of w, x, y, and z is from about 4 to about 20. These compounds are shown to be effective corrosion inhibitors for hydraulic fluids.
摘要:
A corrosion protection material and method for anon-metal alloys, particularly light aluminum alloys; the method comprises the steps of coating a material to be protected with a layer containing a chromium-free inhibitor, comprising at least one dihydroxyazoic salt having structural unit (a), wherein Y is a salt producing anion and M is a metal; for the same number of moles, protection with an effectiveness comparable to that of chromate inhibitors may thus be achieved; ##STR1##
摘要:
The invention is directed generally to controlling corrosion in boiler systems and more particularly to treating boiler water to remove dissolved oxygen and to passivate metal surfaces.
摘要:
Carbohydrazide is an effective material for preventing hydrogen blistering and corrosion in the refinery overhead condensate systems of Fluid Catalytic Cracking Units.
摘要:
An oxygen-scavenging and corrosion-inhibiting agent for fluidic systems comprising an aminoguanidine compound selected from the formula: ##STR1## or a salt thereof, wherein R is selected from H or a lower alkyl group having 1 to 4 carbon atoms; wherein X is selected from NH or NNH.sub.2 ; and Y is selected from --NH.sub.2 or --NHNH.sub.2.