Preparing Utilizing An Inorganic Compound Containing Phosphorus And Sulfur Patents (Class 562/814)
  • Inhibiting ferrous metal corrosion by aqueous ammoniate solutions
    Patent number: 5871667
    Abstract: Aqueous ammoniate solutions made during the manufacture of N-hydrocarbyl thiophosphoric triamides, consisting essentially of aqueous solutions of ammonium chloride and ammonia containing a water-soluble impurity normally tending to engender corrosion of ferrous metal are rendered corrosion-resistant by dissolving therein a small corrosion-inhibiting amount (e.g., up to about 5000 ppm (wt/wt) of a water-soluble salt or oxide of zinc, aluminum, arsenic, antimony or bismuth.
    Type: Grant
    Filed: January 21, 1997
    Date of Patent: February 16, 1999
    Assignee: Albemarle Corporation
    Inventors: Chi Hung Cheng, Gerald M. Sulzer