TR-121 trivalent chromium blue-white Passivator

This trivalent chromium passivation process which without hexachromium and oxidizer, it passed SGS

the range of operation to assure normal operation of passivation.  3.     in the use of passivation bath, must check PH value and temperature of the passivation solution, they should be in  250-300ppm).  the  iron  impurity  can  easily  get  into  passivation  solution  to  effect  passivation  solution.(max  capacity  of  iron  is  2.     bath, heating or cooling equipment or tool basket do not use the ironed or stainless steel equipment, in this way  zinc is 10g/l).  also speed up, and it can overcome the phenomena of quick reaction through shortening time.(max capacity of  1.     passivation is carrying on though, the content of zinc in the bath will increase, so the velocity of passivation will Note: 250ppm) If  without  effects  by  changing  1  and  2,  still  appearing  yellow  color,  it  is  iron  impurity  problem  (iron  is  more  than increasing the concentration of passivation solution(ideality concentration is 7vol%) extending the time of passivation adjusting PH with diluted solution of sodium bicarbonate 3. 2. 1. extending the time of passivation adjusting to the range of the process greater than 1.7 Short time Concentration too low PH too low 6. Passivation insufficient ------- red yellow Reducing passivation time. Adjusting the concentration of passivation solution to the range of the process. Adjusting pH to the range of process with diluted nitric acid. 3. 2. 1. confirm with practical needs of parts not greater than 7vol% generally  should be less than 2.2 Time too long Concentration too high PH too high 5.   Excessive passivation ------- yellow  (yellow)  (red-yellow)  (yellow) possibility appearing in color  Iron impurity  Passivation insufficient  Excessive passivation Cause 3. 2. 1.  Bring about yellowing problem: 4. How to use TR-121 correctly  metal impurity.  dragged  in  for  treatment  uncompleted  zinc plating  parts  (long  tubes),TR-121  is  sensitive  to  lead  and  other  heavy  iron ions, according to concentration of built bath, the range of iron ions is 250-500ppm,plenty of iron ions can be  parts  in  alkaline  zinc  plating.  The  TR-121  without  use  time  limitation,  the  effective  factor  is  the  concentrations  of  Serving as last step process before passivation, we recommend an acid dip by 0.5%Vol nitric acid, especially for  Hint:  practice operation.  condense  solution  of  TR-121,about  12000-14000dm2/l,  the  customer  can  adjust  additive  quantity  according  to  According to normal operation, do not consider drag-out and drag-in of solution, only due to passivation consume  Consume:  Workpiece movement or air agitation  Agitation:  The steel bath with resistance acid plastic lining  appear yellow color on the surface of passivation  reduce resistance erosion power adjusting with nitric acid or sodium bicarbonate (or sodium carbonate) 2.0 25°C 20-30sec  7 Vol% best operation  1.7-2.2  15-30°C  remove irons water 10-20 sec  5-12Vol% range of operation Material of bath: PH>2.2 PH<1.7 PH Temperature: Water nine(before dry) Immersing time: TR-121 (condense solution) Make-up of new solution good   strength.   The 3. Operation conduction:  nine     ?     hot water nines(remove irons water)     ?     water  zinc  plating       ?       nine       ?       immersed  HNO3(0.5%)     ?       nine       ?          immersed  TR-121  ?     cold  water 2. Process flow:  F.     According with American GME 0025 and GMW-3044 standard.  E.    The using time is longer, it is more effective to use latter nine bath solution.  environment requirement.  D.    Because  it  is  trivalent  chromium  solution,  it  reduces  the  cost  of  waste  water  treatment,  also  can  satisfy  for  passivation layer is easy to dye by organic dye.  C.    Even   through   short   immerging   time,   it   can   form   blue-white   passivation   layer   with  erosion standard.  B.    The  blue-white  passivation  workpiece  for  barrel  plating  is  also  apparently  superior  to  general  resistance  international accreditation  A.    This   trivalent   chromium   passivation   process   which   without   hexachromium   and   oxidizer,   it   passed   SGS 1.   Character: 

TR-121 trivalent chromium blue-white Passivator