Abstract: The invention relates to a process for the surface treatment of stainless steel and/or of a nickel alloy. It also relates to the use of such a process and to a stainless steel treated by the process or of a treated nickel alloy. It is envisaged that the treatment is carried out with peroxide or with a water/peroxide mixture or with a peroxide solution.

Abstract: In this decontamination process, the surfaces contaminated with radioactive substances, in particular on components of cooling circuits in nuclear reactors, are treated in a first treatment step with an aqueous decontamination solution, containing chromic acid and permanganic acid, at a temperature in the range from 270 to 350 K, in particular at usual room temperature. The contaminated surface layers are thus oxidized by means of the permanganic acid, while the effect of the chromic acid is that the modified surface layers do not adhere firmly. In a second treatment step, the surface layers thus modified are removed by a chemical treatment in the same temperature range, as a result of dissolution, or/and removed by mechanical or hydraulic action. Aqueous solutions of organic acids are suitable for the chemical treatment in the second treatment step, it also being advantageously possible to add reducing agents and complexing agents and/or corrosion inhibitors.

Abstract: Pharmaceutical compositions comprising as the active ingredient thereof an aminopyridazine derivative of the formula: ##STR1## wherein R.sub.1 is amino, or ##STR2## wherein each of R.sub.3 and R.sub.4 is alkyl of 1 to 4 carbon atoms, orR.sub.3 and R.sub.4 together with the carbon atom to which they are bound, form a cycloalkylidene radical of 5 to 12 carbon atoms,R.sub.2 is hydrogen or methyl,A is --(CH.sub.2).sub.n --, wherein n is 0 or an integer from 1 to 7, or >N--CO--R.sub.5, wherein R.sub.5 is alkyl of 1 to 16 carbon atoms, alkenyl of 3 to 6 carbon atoms, cycloalkyl of 3 to 8 carbon atoms, 1-adamantyl, or --(CH.sub.2).sub.m --R.sub.6, whereinm is 0 or an integer from 1 to 4, andR.sub.

Abstract: This invention provides new compounds of formula I, ##STR1## wherein R.sub.1 is amino, or ##STR2## wherein each of R.sub.3 and R.sub.4 is independently alkyl of 1 to 4 carbon atoms,R.sub.2 is alkyl of 1 to 4 carbon atoms or phenyl,R.sub.8 is hydrogen or alkyl of 1 to 4 carbon atoms, andA is --(CH.sub.2).sub.n --,wherein n is an integer from 1 to 3, with the proviso that when R.sub.1 is amino, R.sub.2 is methyl or phenyl and R.sub.8 is hydrogen,n is 2 or 3,or .dbd.N--CO--R.sub.5,wherein R.sub.5 is alkyl of 1 to 6 carbon atoms, alkenyl of 3 to 6 carbon atoms, a --(CH.sub.2).sub.m --R.sub.6 group,whereinm is an integer from 0 to 2, andR.sub.6 is phenyl, or phenyl monosubstituted by fluorine, chlorine, bromine, alkyl of 1 to 4 carbon atoms, alkoxy of 1 to 4 carbon atoms or alkylmercapto of 1 to 4 carbon atoms,or an --OR.sub.7 group,wherein R.sub.

Abstract: This invention provides new compounds of formula I, ##STR1## wherein R.sub.1 is amino, or ##STR2## wherein each of R.sub.3 and R.sub.4 is independently alkyl of 1 to 4 carbon atoms,R.sub.2 is alkyl of 1 to 4 carbon atoms or phenyl,R.sub.8 is hydrogen or alkyl of 1 to 4 carbon atoms, andA is --(CH.sub.2).sub.n --,wherein n is an integer from 1 to 3, with the proviso that when R.sub.1 is amino, R.sub.2 is methyl or phenyl and R.sub.8 is hydrogen, n is 2 or 3,or .dbd.N--CO--R.sub.5,wherein R.sub.5 is alkyl of 1 to 6 carbon atoms, alkenyl of 3 to 6 carbon atoms, a --(CH.sub.2).sub.m --R.sub.6 group, wherein m is an integer from 0 to 2, and R.sub.6 is phenyl, or phenyl monosubstituted by fluorine, chlorine, bromine, alkyl of 1 to 4 carbon atoms, alkoxy of 1 to 4 carbon atoms or alkylmercapto of 1 to 4 carbon atoms,or an --OR.sub.7 group,wherein R.sub.

Abstract: This invention provides aminopyridazine derivatives of formula I, ##SPC1##whereinR.sub.1 is amino, or an ##EQU1## group, wherein each of R.sub.3 and R.sub.4 is alkyl of 1 to 4 carbon atoms, orR.sub.3 and R.sub.4 together with the carbon atom to which they are bound, form a cycloalkylidene radical of 5 to 12 carbon atoms,R.sub.2 is hydrogen or methyl,A is a --(CH.sub.2).sub.n -- group,Whereinn is 0 or an integer from 1 to 7, or an >N--CO--R.sub.5 group,WhereinR.sub.5 is alkyl or alkenyl of 1 to 16 carbon atoms, cycloalkyl of 3 to 8 carbon atoms, 1-adamantyl, or a --(CH.sub.2).sub.m --R.sub.6 group,Whereinm is 0 or an integer from 1 to 4, andR.sub.