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Product Short Description: Extra pure NITRIC , removes iron residue & forms an oxide layer that boosts the corrosion resistance of the stainless steel intended to improve the corrosion resistance
Product Description:

Extra pure NITRIC , removes iron residue & forms an oxide layer that boosts the corrosion resistance of the stainless steel intended to improve the corrosion resistance of parts made from austenitic, ferritic and martensitic corrosion-resistant steels of the 200, 300 and 400 series and precipitation hardened corrosion-resistant steels.
 

Product Application:

Transparent, colourless or yellowish corrosive liquid. A strong oxidizing agent that will attack almost all metals.

Passivation Treatments

• Grades with at least 16% chromium (except free machining grade such as 303):

20-50% nitric acid, at room temperature to 40oC for 30-60 minutes.

• Grades with less than 16% chromium (except free machining grades such as 416):

20-50% nitric acid, at room temperature to 40oC for 60 minutes.

• Free machining grades such as 303, 416 and 430F:

20-50% nitric acid + 2-6% sodium dichromate, at room temperature to 50oC for 25 40 minutes
 

Pickling Treatments

• All stainless steels (except free machining grades):

8-11% sulphuric acid, at 65 to 80oC for 5-45 minutes.

• Grades with at least 16% chromium (except free machining grades):

15-25% nitric acid + 1-8% hydrofluoric acid, at 20 to 60oC for 5-30 minutes.

• Free machining grades and grades with less than 16% chromium such as 303, 410 and 416: 10-15% nitric acid + 0.5-1.5% hydrofluoric acid, at 20 to 60oC for 5-30 minutes.

Product Dose:
High carbon, high chromium martensitic 440C grades which are selected for high hardness and resistance may be exempt from passivation treatments at the discretion of the procuring activity.

PRECAUTION :
1> Loose iron particles or other foreign particles must be removed or they will appear as rust or stain spots. may become smeared over or imbedded into the surface of corrosion-resistant steel parts.
2> DO avoid chlorides that, in excess, can cause a harmful flash attack. When possible, use only a good grade of water containing less than about 50 parts per million (ppm) of chlorides. Tap water is usually adequate, and in some cases up In several hundred ppm chlorides can be tolerated.


Chlorides: are present in many cleaning agents. This entails risk of pitting corrosion of stainless steel. If a cleaner containing chlorine, chlorides, bleaches orhypochlorites is used it must be afterwards promptly and thoroughly cleaned off.
Product Note:

During processing operations such as forming, machining, tumbling and lapping, iron particles or other foreign particles may become smeared over or imbedded into the surface of corrosion-resistant steel parts. These particles must be removed or they will appear as rust or stain spots.

High carbon, high chromium martensitic 440C grades which are selected for high hardness and resistance may be exempt from passivation treatments at the discretion of the procuring activity.

CAS NUMBER  7697-37-2

ITEM

:

NITRIC ACID  ( HNO3  )

Molecular Weight

:

63.01

Composition

:

H 1.60 %  NO398.40%
 

 

  

SPECIFICATION OF PRODUCT

 

 

HNO3CONTENT, WT.% MIN

:

62 - 68 %

MINIMUM FREEZING POINT

:

5.3OC

IDENTITY

:

BY IR Spectrum

APPEARANCE

:

CLEAR WHITE FUMING NITRIC ACID

NOTE : IT IS DECOMPOSED BY LIGHT OR ELEVATED TEMP., BECOMING RED IN COLOUR FROM NITROGEN DIOXIDE.

CARBONISABLE SUBSTANCES

:

PASSES THE TEST

COLOUR, MAX

:

10 HU

NON VOLATILE MATTER

:

0.001%

CHLORIDE CONTENT, PPM, MAX

:

0.1 ppm

ORGANIC IMPURITIES

:

Passes test

SULPHUR TOTAL AS SULPHATES, PPM, MAX

:

0.5 ppm

PHASE

:

LIQUID
Product Technical Specification:

Nitric Acid (68%) Safety Data Sheet

Chemical Identity

Chemical Name

Nitric Acid

Chemical Classification

Inorganic Acid

Formula

HNO3

CAS Number

7697-37-2

UN Number

2031

Shipping Name

Nitric Acid

Codes / Label

Corrosive, Oxidiser, Class 8

Hazardous waste ID No.

16

Hazchem Code

2 PE

 

 
 

 

Physical / Chemical Data

Boiling Point / Range

120 Deg. C

Melting / freezing Point

- 40 Deg. C

PhysicalState

Watery Liquid

Specific Gravity

1.40

Solubility in water

Soluble

PH

Acidic

Appearance

Colourless to Brown

Odour

Choking Odour

 
 

 

Fire / Explosion Hazard Data

Flammability

No

LEL / UEL

Not Pertinent

Flash Point

Not Pertinent

Autoignition Temperature

Not Pertinent

Explosion Sensitivity to Impact

Stable

Explosion Sensitivity to Static Electricity

Stable

Hazardous Combustion Products

May emit poisonous oxides of
Nitrogen and Acid fumes

Oxidiser

Yes

Corrosive Material

Yes

Combustible / Flammable / Explosive Material

No

 

 

Health Hazards / First Aid Measures
Seek Medical help immediately in case of ingestion / inhalation / contact with skin. In the meanwhile following actions are recommended.

Inhalation

Remove the victim to fresh air area. Provide artificial respiration if required.

Ingestion

Give large quantities of water. Do not induce vomiting.

Contact with skin

Flush the affected area with plenty of water for long time.

 

 

 

 

Preventive Measures
Avoid contact with liquid or vapours. Provide air mask, rubber acid suit, hood, boots, gloves, safety goggles, face shield to the workmen. Water shower and eye wash basin should be provided near the workplace.

Spills
Dilute with water and neutralise with alkali.

 
Remarks:

Hazard: Dangerous fire risk in contact with organic materials. Highly toxic by inhalation, corrosive to the skin and mucous membranes. Uses :Organic synthesis (dyes, drugs, explosives, cellulose nitrate, nitrate salts ), photoengraving, etching steel. 

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