# Aluminum deoxidizers

Supplied aluminum deoxidizer products, distinct pretreatment roles, disclosed chemistry, property bases, and limits on alloy and performance claims.

Reviewed: 2026-10-29

Tags: chemicals, aluminum, surface-treatment

## Identity and process role

Henkel identifies BONDERITE C-IC **DEOXDZR 6 MU** as Deoxidizer 6/16, a liquid additive for mineral-acid deoxidizing and desmutting. The supplied additive has a separate identity from the treatment bath. [Henkel TDS](https://datasheets.tdx.henkel.com/BONDERITE-C-IC-DEOXDZR-6-MU-en_GL.pdf) The Aluminum Anodizers Council distinguishes removal of natural oxide and heat-treatment scale from degreasing, matte etching and brightening. [AAC, chemical finish section](https://www.anodizing.org/wp-content/uploads/2024/09/specifying-anodized-finishes.pdf)

This reference concerns formulated chemical products. Electrochemical deoxidation, metallurgical
deoxidizing additions, and brazing fluxes have separate scopes. See the broader
[Surface-finishing processes](../../processes/finishing/index.md).

The following distinctions are explanatory synthesis from the cited literature.

| Term | Distinction relevant to a supplied deoxidizer |
| --- | --- |
| Soak cleaner or degreaser | Oil and soil removal is a separate function. Acid identity alone does not establish detergent performance. |
| Etchant | Metal removal and texture change can accompany deoxidizing, but oxide removal does not specify a dimensional allowance or matte finish. |
| Desmutter | Smut removal is a separately named commercial function. A combined deoxidizing and desmutting claim does not establish equal removal of every residue. |
| Brightener | A specular appearance has a separate leveling objective. Brightness does not measure residual oxide. |
| Anodizing or conversion treatment | A subsequent treatment has its own chemistry and acceptance requirements. A pretreatment product does not identify the resulting coating. |

AAC describes anodizing as electrochemical oxidation and distinguishes chemical preparation from
the anodic finish. [AAC, chemical and anodic finish sections](https://www.anodizing.org/wp-content/uploads/2024/09/specifying-anodized-finishes.pdf).

## Named products illustrate different supply roles

These examples identify manufacturer literature, not interchangeable formulations or qualified
substitutes. Operating instructions are outside this comparison.

| Exact product and source | Supplied identity and declared role | Boundary of the evidence |
| --- | --- | --- |
| Henkel BONDERITE C-IC DEOXDZR 6 MU, known as Deoxidizer 6/16. [Global English TDS, April 2019](https://datasheets.tdx.henkel.com/BONDERITE-C-IC-DEOXDZR-6-MU-en_GL.pdf). | Liquid additive system associated with mineral-acid deoxidizing and desmutting before chromating or anodic coloring. The sheet distinguishes 6 MU, replenisher BONDERITE C-AD DEOXDZR 16R, and additive BONDERITE C-AD ETCH ADD20 AERO. | Nitric and sulfuric acid are separate bath media, not a disclosure of the supplied additive's complete composition. Related component names do not establish identical contents. |
| Hubbard-Hall Deoxidizer 13L, code 2552004. [US bulletin, May 20, 2025](https://www.hubbardhall.com/document?id=2552004&type=TDS). | Acidic, iron-based, water-soluble liquid for deoxidizing and desmutting wrought alloys and cast alloys with silicon below 1%. | The bulletin advises against 5000-series aluminum because pitting may occur. Its broader reference to all aluminum processing lines does not remove that exclusion. |

Hubbard-Hall also claims inhibition of natural oxide-film reformation. The bulletin supplies no
inhibitor identity or quantitative duration. That functional claim does not establish permanent
passivation. [Deoxidizer 13L bulletin, page 1](https://www.hubbardhall.com/document?id=2552004&type=TDS).

## Ingredient disclosure is not a complete formulation

Kempro Services' Canadian ALUMINET MSDS identifies an aluminum deoxidizer and explicitly covers the
concentrate as sold. Section 3 gives the following whole-product mass percentages.
[ALUMINET MSDS, sections 1, 3, and 8](https://www.kemproservices.com/wp-content/uploads/2021/02/ALUMINET-ENG.pdf).

| Disclosed ingredient | CAS number | Percent by weight |
| --- | --- | --- |
| Ortho-phosphoric acid | 7664-38-2 | 5-10% |
| Hydrofluoric acid | 7664-39-3 | 3-6% |

**Explanatory synthesis.** This is evidence of an acid- and fluoride-containing product. It does not
establish free fluoride activity, selective removal of silicon-rich residues, or universal alloy
suitability. Ingredient bands are neither working-bath concentrations nor a complete mass balance.
The remainder cannot be assigned to water by subtraction.

Deoxidizer 13L's bulletin states that it contains neither nitric acid nor chrome compounds. It does
not identify a particular iron salt, complexant, or inhibitor ingredient.
[Deoxidizer 13L bulletin, page 1](https://www.hubbardhall.com/document?id=2552004&type=TDS).
**Synthesis.** An iron-based description alone does not establish a functional oxidizer role. An acid
name likewise does not prove an undisclosed complexant, wetting agent, or corrosion inhibitor.

Henkel separates acid value, product pointage, and reaction titration. These are different analytical
quantities, not alternate names for pH or supplied-product percentage.
[BONDERITE 6 MU TDS, pages 1-2](https://datasheets.tdx.henkel.com/BONDERITE-C-IC-DEOXDZR-6-MU-en_GL.pdf).
No control method or numerical operating limit is reproduced here.

## Property values need a measurement basis

ALUMINET's historical concentrate properties illustrate incomplete measurement conditions.
[ALUMINET MSDS, sections 8-9](https://www.kemproservices.com/wp-content/uploads/2021/02/ALUMINET-ENG.pdf).

| Reported property | Printed value | Missing condition or method |
| --- | --- | --- |
| pH | Less than 3 | No measurement temperature, method, or separate test dilution. |
| Relative density | 1.0-1.1, dimensionless | No reference temperature, reference material, or method. |

**Quantity interpretation, synthesis.** Mass percentage describes ingredient mass relative to product
mass. Volume percentage has a different denominator. Relative density is a ratio, whereas density
requires mass-per-volume units. An unspecified relative-density basis does not support a precise
conversion between these concentration bases.

pH does not specify total acid inventory. Free acid, total acid, dissolved aluminum, and other
dissolved metals are separate quantities with method-dependent meanings. The ingredient bands and
property values above establish none of their acceptance limits. Solids content and a dry-solids
composition basis are not established for these examples.

## Applicability and claim limits

**Interpretation, synthesis.** Supplied liquid or powder form, a trade name, and an ingredient identity
do not establish oxide-removal completeness, smut-removal completeness, etch rate, mass loss, or
dimensional change. Those results depend on the exact alloy and incoming surface as well as the
treatment system. A substrate exclusion remains relevant when another product has a similar acid
description.

"Does not contain chrome compounds" is broader wording than "hexavalent-chromium-free". Neither
wording alone supplies an analytical detection limit or lot certificate. Fluoride-free is a separate
claim from either chromium statement. No fluorine-free, fluoride-free, nonetching, or alloy-safe
class claim follows from the sources compared here.

No matched comparative test in this source set establishes equivalent adhesion, corrosion resistance,
passivation, or coating acceptance between products. Inhibition of oxide reformation does not by
itself establish those outcomes. A deoxidizer designation supplies no customer process qualification,
waste-discharge permission, or environmental certification.

## Source versions and coverage

Sources were reviewed on **October 29, 2026 PDT**. The references describe these retrieved editions,
not current lot acceptance data.

- **Henkel global English TDS.** All three pages read, including component, operating, analytical,
  storage, and disclaimer sections. The technical edition is April 2019. Its November 2025 digital
  generation timestamp does not revise that edition. A matching regional SDS composition is not
  established here.
- **Hubbard-Hall US bulletin.** All three pages read, including the features table, alloy restriction,
  analytical note, and warranty. Revision May 20, 2025. A matching SDS ingredient table was not verified.
- **Kempro Canadian MSDS.** All three pages read. Issued December 31, 2016. Legacy hazard and disposal
  text is not adopted as current guidance. Aluminum appears among section 10 incompatibilities despite
  the intended-use label. Intended application does not establish universal material compatibility.
- **AAC, Specifying Anodized Finishes on Aluminum.** Initial release February 2013. The cover has no
  completed review date. Chemical and anodic finish sections support terminology only. Historical
  designation tables do not establish current product approval.

Powder grades, complete proprietary formulas, complexant identities, quantitative inhibitor effects,
alloy-specific removal tests, and lot data remain outside verified coverage. No bath preparation,
dosing, treatment conditions, or operating recipe is supplied here.