Corrosion Inhibitors

Transcription

1 Public Industrial & Home Care FUN Division Corrosion Inhibitors Getting in between surfaces and harsh environments

2 Importance of Corrosion Inhibition Most of today s cleaners/disinfectants are utilized through a dilution or dispensing system. From Ready to Use trigger sprayers to Aerosol Cans, cleaning solutions are in constant contact with tiny metal parts. Alkaline and acid cleaners are used to clean and disinfect metal surfaces. They are expected not to corrode these sometimes glossy exteriors. Clariant s Inhibitors are the right choice to stop the unwanted effects of corrosion. Slide 2

3 Mechanism of Corrosion Inhibition As an example, the cost of metal corrosion in the U.S. totals ~$276 billion/year 1 A corrosion inhibitor is a chemical compound that, when added in small concentration, stops or slows down corrosion (rust) of metals and alloys. Mechanisms of corrosion inhibition are formation of a passivation layer (a thin film on the surface of the material that stops access of the corrosive substance to the metal), inhibiting either the oxidation or reduction part of the redox corrosion system, or scavenging the dissolved oxygen. 2e - Fe 2+ H + H + Clariant corrosion inhibitors create a layer on the surface of the metal and slow or stop the oxidation and reduction process. 1 Slide 3

4 Product line for Alkaline Cleaners

5 Product Overview Alkaline ph (Applications/Properties) Product Hostacor 2732 Chemistry Isonoanoylamido caproic acid, partially neutralized w/ cyclohexylamine % DEA % Phos None Effective on Ferrous, Aluminum Optimal ph Alkaline TSCA / EC 648/2004 / Biodegradation / / Readily Hostacor IT TEA salt of Isonoanoylamido caproic acid None Ferrous Alkaline / / Readily Hostaphat OPS Alkane Phosphonic acid 16% Phos Ferrous, Aluminum to ph 11 Alkaline / / Readily Afilan AKT Blend of Phosphoric acid esters 7% Phos Non-Ferrous, Aluminum, Yellow metals Alkaline / NL / Readily NL = not listed Most Clariant inhibitors have a long lasting effect against corrosion. Slide 5

6 Hostacor 2732 Hostacor 2732 is an alkyl amido carboxylic acid used as a corrosion inhibitor for aqueous systems including those with heavy amounts of chlorides. It contains no nitrites and is DEA free. Alkanolamine salts of Hostacor 2732 are excellent, low foaming corrosion inhibitors that are stable in hard water. Solubility: Clear (2.5g TEA, 2.5g product, 95ml water) Hostacor 2732 is not soluble in water until neutralized with an amine or aqueous alkali hydroxides. Hostacor 2732 is suitable for both Ferrous and Non-Ferrous metals. When formulating fluids for Aluminum, it is important that the ph is adjusted to approximately 8. A higher ph value may cause strong blackening of the surface. ph 8 ph 8.7 ph 9.1 ph 9.4 Slide 6

7 Hostacor IT Alkanolamine salt of an acylamidocarboxylic acid DEA and Phosphorous Free Water soluble Stable in hard water up to approx. 1000ppm CaCO 3 Most effective on Ferrous metals and in an Alkaline solution Slide 7

8 Hostaphat OPS Octane phosphonic acid and presents corrosion protection when neutralized. Soluble in napthenic mineral oils and in water when neutralized Hostaphat OPS is not stable against hard water and it is recommended to formulate using a complexing or dispersing agent. It is most effective against Alkalinity on Aluminum up to ph 11 with a dosage of 1 to 2%. Hostaphat OPS neutralized with alkanolamine is suitable for protection of Zinc from staining and rust. Slide 8

9 Afilan AKT Blend of phosphoric acid esters Water soluble Especially effective in alkaline environments on non-ferrous and yellow metals including Aluminum, Copper and Brass. Afilan AKT is compatible with virtually all types of Ferrous traditional carboxylic acid based corrosion inhibitors. Controls Afilan AKT shows a strong ability to emulsify Pine Oil and possibly other like oils such as Fragrance Time (min, sec) to separate Afilan AKT Genapol UD 070 (Nonionic Surfactant) Hostapur SAS (Anionic Surfactant) ph 9 (TEA) 9 (TEA) 9 (TEA) Hexane Instant Instant Instant Olive Oil Instant Instant Instant Pine Oil 15min. Instant 5min. Method: 2g active sample in 28g water, add 20g oil and invert 10 times, record time of separation. Slide 9

10 Corrosion Inhibition Performance Corrosion Test DIN 51360/2 examines the effect of water-based fluids on cast iron chips. Product* DIN water Hostacor % Hostacor IT 2.5% Corrosion Test DIN 51360/2 Mark 350ppm water Mark 0 2.5% % 0 Hostaphat OPS ppm water Mark 2.0% 0 2.0% % 0 Water * Percent active in formulation Mark Meaning Description 0 No Corrosion No stains 1 Traces of Corrosion 3 stains at most 2 Slight Corrosion Not more than 1% of surface stained 3 Moderate Corrosion Between 1 and 5% of surface stained 4 Heavy Corrosion More than 5% of surface stained Slide 10

11 Cleaning Performance Multifunctional Corrosion Inhibitors show cleaning ability 30 % Soil Removal All samples are ph 10 (TEA) 5 0 Genapol UD 070 (Nonionic Surfactant) Hostapur SAS (Anionic Surfactant) Hostaphat OPS Afilan AKT Hard Surface cleaning test: ASTM 4488, A5 Particulate and Oily soil on Vinyl Composition Tile All products tested at 0.1% activity in an aqueous solution Slide 11

12 Product line for Acid Cleaners

13 Product Overview Acid ph (Applications/Properties) Product Chemistry % DEA % Phos Effective on Optimal ph TSCA / EC 648/2004 / Biodegradation Hordaphos MDGB Phosphonic acid mono/di/alkyl ester 19.5% Phos Alloys, Aluminum, Steel Acid / / Inherently Dodicor 2565 Solution of quaternary chinolinium in water None Zinc, Steel Acid / NA / Inherently Dodicor 2725NF Solution of quaternary chinolinium mixed w/ alkinol and nonionic in glycol None Low carbon steel, Steel, Aluminum (moderate conditions) Acid NL / NL / Readily NL = not listed NA = not applicable Most Clariant inhibitors have a long lasting effect against corrosion. Slide 13

14 Hordaphos MDGB Phosphoric acid ester Readily soluble in water Most effective against acids on varying metals such as yellow metals, alloys, aluminum, and steel. Controls Emulsification Performance Hordaphos MDGB compared to a Nonionic surfactant and an Anionic surfactant Time (min, sec) to separate Hordaphos MDGB Genapol UD 070 (Nonionic) Hostapur SAS (Anionic) ph 1.1 (as is) 5.8 (as is) 6.5 (as is) Hexane Instant. 30sec. 45sec. Olive Oil Instant. 30sec. 45sec. Pine Oil 3min. 9min. 17min. Method: 2g active sample in 28g water, add 20g oil and invert 10 times, record time of separation. Slide 14

15 Dodicor 2565 Dodicor 2565 is a very specific acid inhibitor for zinc, but also protects steel against attack by mineral acids. Dodicor 2565 is effective at inhibiting sulphamic, phosphoric, sulfuric, hydrochloric, and organic carboxylic acids. The protection level of Dodicor 2565 on steel surfaces does not completely equal that of other specialized inhibitors, but because of its excellent effect on zinc surfaces and, in contrast to other inhibitors, its good solubility and low foam characteristics, it is in many cases preferable to them. Slide 15

16 Dodicor 2565 Inhibition performance Acid (%) Dodicor 2565 (g/l) Temp ( C) Time (h) Protection (%) *Sulphonic (15%) *Phosphoric (10%) *Sulfuric (10%) *Hydrochloric (10%) *HF (2%) + Formic (0.6%) *Dodecyl benzene sulphonic (5%) **Hydrochloric (10%) **Sulphonic (10%) **Phosphoric (10%) * Zinc coupons ** Carbon-Steel Excellent corrosion inhibition with use concentrations of as little as 400ppm Slide 16

17 Dodicor 2725NF Mixture of a quaternary ammonium compound, alkynol and nonionic surfactant in glycol. Excellent solubility in water Is most effective against Hydrochloric and Hydrofluoric solutions on low carbon steel under severe conditions. It is also very effective against sulfamic and sulfuric acids on steel and aluminum at low acid concentrations and moderate temperatures. Acid (%) Dodicor 2725NF (g/l) Temp ( C) Corrosion rate (g/m 2 h) Corrosion rate without inhibitor *Sulfuric (10%) *HCl (10%) *HCl (12%) + HF (3%) **HCl (5%) * Steel ** Aluminum 99.5% Slide 17

18 Synergistic Combinations Combinations of Dodicor 2725 and Dodicor 2565 yield extraordinary corrosion inhibition Inhibiting 10% HCl at 75 C with a mixture of Dodicor 2725 an Dodicor 2565 (4:1) Inhibitor Concentration (g/l) A) Weight loss of steel (g/m 2 /h) Weight loss of zinc >30, B) Weight loss of steel Weight loss of zinc >45, , In case B) the metals, in contrast to A), are in galvanic contact with each other. Slide 18

19 Cleaning Performance Multifunctional Corrosion inhibitors show cleaning benefits Hostapur SAS (Anionic Surfactant) Genapol XS 088 (Nonionic Surfactant) Hordaphos MDGB Dodicor 2565 Dodicor 2725 NF Not only do the Corrosion Inhibitors protect metals, they also enhance cleaning performance compared to Anionic or Nonionic surfactants IKW Modified Bathroom Cleaner Assessment: Soap Scum Soil on Glossy Ceramic Tile All products tested at 1.0% activity in 8.5% Phosporic acid - aqueous solutions (ph ~ 1.8) Slide 19

20 Summary

21 Multifunctional Corrosion Inhibitors Water soluble corrosion inhibitors can be easily formulated into both alkaline and acidic products Maximum protection of Ferric, Zinc, Aluminum, Yellow metals and alloys Multifunctional products offer emulsification and cleaning performance as well as long lasting corrosion inhibition Slide 21