A kind of non-corrosion iron alloy method
The present invention relates to a kind of etching-free plating iron alloy technology.Be used for of the reparation of valuable parts depreciation or machine damage as the 10000-ton class vessel bent axle.
Before the present invention makes, USSR (Union of Soviet Socialist Republics) invention etching-less iron plating process.Because it adopts traditional control current density plating, more complicated plate piece surface quality of coating instability, and coating and the combination of plating piece matrix metal are not firm, and the plating solution performance instability can not plating big, and environment is had pollution.
The purpose of this invention is to provide a kind of etching-free plating iron alloy technology, it is production operation at normal temperatures, the plating whole process is to become control current density to be control voltage, obtains iron-zinc alloy coating and is 15~30nm columnar grain and be combined as a whole with plating the component matrix metal, and hardness can reach H
RC60, to the main and auxiliary machine in naval vessel that wearing and tearing, machine decrease, diesel locomotive, the reparation of valuable component such as power plant land large-sized diesel machine crankshaft, d-axis, turbine rotor axle journal.Reliable in quality, repairing efficiency is short, and less investment is not polluted environment.
Fig. 1 is an etching-free plating iron alloy technology schematic flow sheet of the present invention.
Fig. 2 is a non-corrosion iron alloy plating bent axle synoptic diagram of the present invention.
Etching-free plating iron alloy technology of the present invention is composed as follows:
One, plating (Fig. 1)
1. prepare before the plating to the plating component:
Detection parts wear, machine damage defect shape and size-cleaning greasy dirt-rust cleaning-non-plating position insulation-assembling hanger-remove oil film-salt acidifying water logging to wash-wash
Plating piece is removed tranish film handle, rust cleaning coating solution prescription and processing condition are:
Add HCl 15~18g/L with tap water, embathe part plating surface, normal temperature was handled 3~5 minutes.
2. plating
1) surface active: adjust V earlier
Just=5~7V adjusts V again
Negative, making voltage is 0.0~0.15V, t=5~8min;
2) plating: decline negative half period voltage makes V
Just=0.5~1.2V, t=9~15min;
3) exchange transition plating: V
JustInitial value is motionless, V
NegativeDrop to V gradually
JustTill=4~6V, t=15~20min;
4) just change dc plating: V
Just=4~5V, t=10~20min;
5) direct current transition plating: V
JustBe raised to 5~8V gradually, t=15~20min;
6) full dc plating: V
Directly=5~8V until plating is finished, goes out the groove neutralizing treatment.
Two, in the etching-free plating iron alloy technology provided by the present invention, the prescription of its plating bath is:
FeCl
3 200g/L
HCL 13~17g/L
MnCl
2 10~15g/L
NiCl
2 20~25g/L
CoCl
2 10~15g/L
NaCl 10~15g/L
Three, the preparation method of non-corrosion iron alloy electroplating bath provided by the present invention is:
Use drinking public water supply, under normal temperature condition, prepare,, must reach the drinking public water supply standard through chemical examination if during with the preparation of well water or other water sources, then available.
At first with the acidified water that contains HCl 13~17g/L, FeCl
3200g/L dissolving wherein and filter 2~4 times, thereafter, electrolytic solution is handled routinely, passes in time, solution when being converted into dark brown → yellowish brown → light brown → yellow-green colour → emerald green, is pressed MnCl by brown naturally
210~15g/L, NiCl
220~25g/L, CoCl
210~15g/L, NaCl 10~15g/L adds wherein in proper order, and regulating proportion is 1.20~1.26, and the pH value is 0.7~1.0, continue energising and handle, on negative electrode, be covered with spherical, light, during silvery white dross, indicate that the non-corrosion iron alloy electroplating bath is qualified, can the plating component.
A kind of etching-free plating iron alloy technology embodiment 1 of the present invention, as shown in Figure 2.
The overproof reparation of 10000-ton class vessel crankshaft wear
1 bent axle is cleaned greasy dirt, 2 crank throw axle journals, the rust cleaning of 3 bolster axle journals polishes uneven place of wearing and tearing and burn, thereafter again, give insulation processing all 4 non-plating surfaces, the assembling hanger embathed 4 minutes with HCl 15g/L acidified water, removed tranish film, the normal temperature flushing is finished, and goes into plating in the non-corrosion iron alloy electroplating bath: 1) surface active: give earlier and adjust V
Just=6V transfers V again
Negative=0.1V, t=8min;
2) plating: decline negative half period voltage makes V
Just=0.8V, t=10min;
3) exchange transition plating: V
JustInitial value is motionless, V
NegativeDrop to V gradually
JustTill=the 5V, t=15min;
4) just change dc plating: V
Just=5V, t=15min;
5) direct current transition plating: V
RiseBe raised to 6V, t=18min;
6) full dc plating: V
Directly=6V finishes up to plating.Go out the groove neutralizing treatment.Then by original design specified size mill stripping processing, press ship inspection standard test quality.
The preparation of the used non-corrosion iron alloy electroplating bath of this renovation technique is: under normal temperature condition, use drinking public water supply, make the acidified water that contains HCl 15g/L earlier, FeCl
3200g/L adds wherein, dissolving after-filtration two times, and electrolytic solution is handled routinely, and solution when being converted into dark brown → yellowish brown → light brown → yellow-green colour → emerald green, is pressed MnCl by brown naturally
212g/L, NiCl
223g/L, CoCl
212g/L, NaCl 12g/L adds wherein in proper order, regulating proportion is 1.2, pH value is 0.8, continues energising and handles, on negative electrode, be covered with spherical, light, during silvery white dross, plating bath is qualified, begins plating.
A kind of etching-free plating iron alloy technology embodiment 2 of the present invention.
The reparation of diesel locomotive bent axle many places burn
Because engine-damaged accident makes the jerk value of main journal overproof, a plurality of neck of bent axle axis tile burns can not move.Adopt etching-free plating iron alloy technology of the present invention reparation: colding pressing earlier to proofread and correct makes jerk value qualified, regrinds and shells the axle journal of respectively burning, and refers again to Fig. 1, Fig. 2 and handles, and its plating technology main points are with embodiment 1, and the bent axle that plating is finished meets diesel locomotive bent axle ministerial standard.